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SPRAYENGINEERING
HANDBOOK
CTG SH 07 EU
TECHNICAL PUBLICATIONSPNR manufactures a complete range of spray nozzles for industrial applications and many other products and systems designed accordingto the latest cutting-edge technologies All our products are described in the following catalogues
PRODUCT RANGE CTG TVGENERAL PURPOSE SPRAY NOZZLES CTG UGAIR ASSISTED ATOMIZERS CTG AZCOMPLEMENTARY PRODUCTS AND ASSEMBLY FITTINGS CTG ACINDUSTRIAL TANK WASHING SYSTEMS CTG LSPAPER MILL PRODUCTS CTG PMEVAPORATIVE COOLING LANCES CTG LNSTEELWORK NOZZLES CTG SWSPRAYDRY NOZZLES CTG SDFIREFIGHTING PRODUCTS AND SISTEMS CTG FF
Our technical literature is continuously revised and updated and sent to our Customers who are listed in our Catalogues Delivery List If you are interested inreceiving the latest version of our catalogues please contact the nearest PNR officeWAIVER OF RESPONSABILITYThe information contained herein is provided as is and PNR does not guarantee the correctness and accuracy of the sameThis publication may contain technical inaccuracies or typographical errors It may also be subject to periodic changes without prior notice
INDEXGENERAL INFORMATION
International system of units 4Prefix tables for SI units 5Conversion table American units to SI units 5Conversion tables temperature scales 6Metric and decimal equivalents of fractions of an inch 7
LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PNR PRODUCT RANGE
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Foreword
Along many years PNR engineers have been involved with Customers to find out theappropriate solution to specific application problems in numberless different industriesThis continuous cooperation has allowed us to gather a large uantity of informationregarding practical spray nozzles applications which we make available every day to ourCustomersWe like to thank alI our Customers for their past cooperation and for the invaluable helpthey have given us in designing and manufacturing an always more complete and efficientrange of spray nozzles and spraying systemsTo make this information readily available and improve our service we have now decidedto gather and organize it within a manualWe hope the reader will appreciate our work and welcome any suggestion or additionwhich may lead to improve and complete this manual
GENERAL INFORMATIONInternational system of units 4Prefix tables for SI units 5Conversion table American units to SI units 5Conversion tables temperature scales 6Metric and decimal equivalents of fractions of an inch 7
GENERAL INFORMATION
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Description
The INTERNATIONAL S STEM OF UNITS sometimes called SI has been defined by the International Standards OrganizationISO and is based upon metric units The following notes include most units which are likely to be used in handing of fluidsThe system consists of nine base units and supplementary units which are coherently derived from them The coherence con-sists in the fact that the product or the uotient of any two unit uantities in the system result in another unit uantityBecause of the world wide trend to use this modern metric system we are providing in the following the conversion constantsfor the most useful units
Base Units and deri ed units
The SI has defined the following base unit
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N UANTIT UNIT NAME UNIT S MBOL
Length meter m
Mass kilogram kg
Time second s
Thermodynamic temperature Kelvin K
Molecular substance mole mol
Electric current Ampere A
Light intensity candela cd
Plane angle radiante rad
Solid angle steradian sr
Out of these base units many other have been derived the most interesting for our purposes being listed below
N UANTIT UNIT NAME UNIT S MBOL E UI ALENCES
Area s uare meter m
Volume cubic meter m
Density kilogram per cubic meter Kgm
Velocity meter per second ms
Acceleration meter per second s uared ms
Angular velocity radian per second rad s
Fre uency Hertz Hz Hz cicli s
Force Newton N N kg ms
Pressure Pascal Pa Pa Nm
Momentum kilogram meter per second Kg ms
Energy oule N m
Power Watt W W s
Moment of force Newton meter N m
Kinematic viscosity s uare meter per second m s
Dynamic Viscosity Pascal second Pa s
Thermal conductivity Watt per meter Kelvin W m K
GENERAL INFORMATION International system of units
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AMERICAN UNIT CON ERSION FACTOR SI UNITPound masscubic feet kilogramscubic meterGallons per minute liters per minute lpmUS Gallon liter IPound force Newton NBTU British Thermal Unit oule BTU per hour Watt WBTU per pounddeg F oule kg Kmil Micrometer micronInches millimeters mmFoot meter mHorsepower kilowatt kWPounds per s uare inch bar bar kPaBTU per pound oule per kgLbs per gallon kg per liter kglS uare inch s uare centimeter cm S uare foot s uare meter m Acre hectares haFoot per second meters per second msecFoot per minute meters per minute mminMiles per hours kilometers per hour kmhKnots kilometers per hour kmhCubic foot cubic meter m Cubic inch cubic centimeter cm Pound kilogram kgTon metric ton t
UANTITDENSITYFLOW RATEFLUID VOLUMEFORCEHEATHEAT TRANSFERSPECIFIC HEAT CAPACITYLENGHTLENGHTLENGHTPOWERPRESSURECALORIC VALUE ENTALPYSPECIFIC WEIGHTSURFACESURFACESURFACEVELOCITYVELOCITYVELOCITYVELOCITYVOLUMEVOLUMEWEIGHTWEIGHT
Multiply American Units on the left (by the conversion factor) to obtain SI Units on the rightDivide SI Units on the right (by the conversion factor) to obtain American Units on the left
GENERAL INFORMATION Prefix tables for SI units
Prefixes
SI units can be indicated together with a prefi to easily indicate very large or very small numbersAs an e ample visible light has a wave length of appro imately m meters which can be more easily written as nm nanometersPlease note it is not allowed to use prefi es together you cannot write m da-km
0n Prefix Symbol Denomination Decimal e ui alent yotta Y zetta Z e a E peta P tera T giga G mega M Million kilo k Thousand etto h Hundred deca da Ten - deci d Tenth - centi c Hundredth - milli m Thousandth - micro Millionth - nano n - pico p - femto f - atto a - zepto z - yocto y
GENERAL INFORMATION Conversion table American units to Si units
NoteBecause of discrepancies between some denominations in English and American we only mention the commonly used deno-minations
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
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C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
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A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
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A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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TECHNICAL PUBLICATIONSPNR manufactures a complete range of spray nozzles for industrial applications and many other products and systems designed accordingto the latest cutting-edge technologies All our products are described in the following catalogues
PRODUCT RANGE CTG TVGENERAL PURPOSE SPRAY NOZZLES CTG UGAIR ASSISTED ATOMIZERS CTG AZCOMPLEMENTARY PRODUCTS AND ASSEMBLY FITTINGS CTG ACINDUSTRIAL TANK WASHING SYSTEMS CTG LSPAPER MILL PRODUCTS CTG PMEVAPORATIVE COOLING LANCES CTG LNSTEELWORK NOZZLES CTG SWSPRAYDRY NOZZLES CTG SDFIREFIGHTING PRODUCTS AND SISTEMS CTG FF
Our technical literature is continuously revised and updated and sent to our Customers who are listed in our Catalogues Delivery List If you are interested inreceiving the latest version of our catalogues please contact the nearest PNR officeWAIVER OF RESPONSABILITYThe information contained herein is provided as is and PNR does not guarantee the correctness and accuracy of the sameThis publication may contain technical inaccuracies or typographical errors It may also be subject to periodic changes without prior notice
INDEXGENERAL INFORMATION
International system of units 4Prefix tables for SI units 5Conversion table American units to SI units 5Conversion tables temperature scales 6Metric and decimal equivalents of fractions of an inch 7
LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PNR PRODUCT RANGE
INDE
X
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Foreword
Along many years PNR engineers have been involved with Customers to find out theappropriate solution to specific application problems in numberless different industriesThis continuous cooperation has allowed us to gather a large uantity of informationregarding practical spray nozzles applications which we make available every day to ourCustomersWe like to thank alI our Customers for their past cooperation and for the invaluable helpthey have given us in designing and manufacturing an always more complete and efficientrange of spray nozzles and spraying systemsTo make this information readily available and improve our service we have now decidedto gather and organize it within a manualWe hope the reader will appreciate our work and welcome any suggestion or additionwhich may lead to improve and complete this manual
GENERAL INFORMATIONInternational system of units 4Prefix tables for SI units 5Conversion table American units to SI units 5Conversion tables temperature scales 6Metric and decimal equivalents of fractions of an inch 7
GENERAL INFORMATION
INTR
ODUC
TION
GENE
RAL
INFO
RMAT
ION
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Description
The INTERNATIONAL S STEM OF UNITS sometimes called SI has been defined by the International Standards OrganizationISO and is based upon metric units The following notes include most units which are likely to be used in handing of fluidsThe system consists of nine base units and supplementary units which are coherently derived from them The coherence con-sists in the fact that the product or the uotient of any two unit uantities in the system result in another unit uantityBecause of the world wide trend to use this modern metric system we are providing in the following the conversion constantsfor the most useful units
Base Units and deri ed units
The SI has defined the following base unit
GENE
RAL
INFO
RMAT
ION
N UANTIT UNIT NAME UNIT S MBOL
Length meter m
Mass kilogram kg
Time second s
Thermodynamic temperature Kelvin K
Molecular substance mole mol
Electric current Ampere A
Light intensity candela cd
Plane angle radiante rad
Solid angle steradian sr
Out of these base units many other have been derived the most interesting for our purposes being listed below
N UANTIT UNIT NAME UNIT S MBOL E UI ALENCES
Area s uare meter m
Volume cubic meter m
Density kilogram per cubic meter Kgm
Velocity meter per second ms
Acceleration meter per second s uared ms
Angular velocity radian per second rad s
Fre uency Hertz Hz Hz cicli s
Force Newton N N kg ms
Pressure Pascal Pa Pa Nm
Momentum kilogram meter per second Kg ms
Energy oule N m
Power Watt W W s
Moment of force Newton meter N m
Kinematic viscosity s uare meter per second m s
Dynamic Viscosity Pascal second Pa s
Thermal conductivity Watt per meter Kelvin W m K
GENERAL INFORMATION International system of units
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GENE
RAL
INFO
RMAT
ION
AMERICAN UNIT CON ERSION FACTOR SI UNITPound masscubic feet kilogramscubic meterGallons per minute liters per minute lpmUS Gallon liter IPound force Newton NBTU British Thermal Unit oule BTU per hour Watt WBTU per pounddeg F oule kg Kmil Micrometer micronInches millimeters mmFoot meter mHorsepower kilowatt kWPounds per s uare inch bar bar kPaBTU per pound oule per kgLbs per gallon kg per liter kglS uare inch s uare centimeter cm S uare foot s uare meter m Acre hectares haFoot per second meters per second msecFoot per minute meters per minute mminMiles per hours kilometers per hour kmhKnots kilometers per hour kmhCubic foot cubic meter m Cubic inch cubic centimeter cm Pound kilogram kgTon metric ton t
UANTITDENSITYFLOW RATEFLUID VOLUMEFORCEHEATHEAT TRANSFERSPECIFIC HEAT CAPACITYLENGHTLENGHTLENGHTPOWERPRESSURECALORIC VALUE ENTALPYSPECIFIC WEIGHTSURFACESURFACESURFACEVELOCITYVELOCITYVELOCITYVELOCITYVOLUMEVOLUMEWEIGHTWEIGHT
Multiply American Units on the left (by the conversion factor) to obtain SI Units on the rightDivide SI Units on the right (by the conversion factor) to obtain American Units on the left
GENERAL INFORMATION Prefix tables for SI units
Prefixes
SI units can be indicated together with a prefi to easily indicate very large or very small numbersAs an e ample visible light has a wave length of appro imately m meters which can be more easily written as nm nanometersPlease note it is not allowed to use prefi es together you cannot write m da-km
0n Prefix Symbol Denomination Decimal e ui alent yotta Y zetta Z e a E peta P tera T giga G mega M Million kilo k Thousand etto h Hundred deca da Ten - deci d Tenth - centi c Hundredth - milli m Thousandth - micro Millionth - nano n - pico p - femto f - atto a - zepto z - yocto y
GENERAL INFORMATION Conversion table American units to Si units
NoteBecause of discrepancies between some denominations in English and American we only mention the commonly used deno-minations
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
GENE
RAL
INFO
RMAT
ION S MBOL NAME MP BP NOTES
C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENE
RAL
INFO
RMAT
ION
GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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Foreword
Along many years PNR engineers have been involved with Customers to find out theappropriate solution to specific application problems in numberless different industriesThis continuous cooperation has allowed us to gather a large uantity of informationregarding practical spray nozzles applications which we make available every day to ourCustomersWe like to thank alI our Customers for their past cooperation and for the invaluable helpthey have given us in designing and manufacturing an always more complete and efficientrange of spray nozzles and spraying systemsTo make this information readily available and improve our service we have now decidedto gather and organize it within a manualWe hope the reader will appreciate our work and welcome any suggestion or additionwhich may lead to improve and complete this manual
GENERAL INFORMATIONInternational system of units 4Prefix tables for SI units 5Conversion table American units to SI units 5Conversion tables temperature scales 6Metric and decimal equivalents of fractions of an inch 7
GENERAL INFORMATION
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Description
The INTERNATIONAL S STEM OF UNITS sometimes called SI has been defined by the International Standards OrganizationISO and is based upon metric units The following notes include most units which are likely to be used in handing of fluidsThe system consists of nine base units and supplementary units which are coherently derived from them The coherence con-sists in the fact that the product or the uotient of any two unit uantities in the system result in another unit uantityBecause of the world wide trend to use this modern metric system we are providing in the following the conversion constantsfor the most useful units
Base Units and deri ed units
The SI has defined the following base unit
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N UANTIT UNIT NAME UNIT S MBOL
Length meter m
Mass kilogram kg
Time second s
Thermodynamic temperature Kelvin K
Molecular substance mole mol
Electric current Ampere A
Light intensity candela cd
Plane angle radiante rad
Solid angle steradian sr
Out of these base units many other have been derived the most interesting for our purposes being listed below
N UANTIT UNIT NAME UNIT S MBOL E UI ALENCES
Area s uare meter m
Volume cubic meter m
Density kilogram per cubic meter Kgm
Velocity meter per second ms
Acceleration meter per second s uared ms
Angular velocity radian per second rad s
Fre uency Hertz Hz Hz cicli s
Force Newton N N kg ms
Pressure Pascal Pa Pa Nm
Momentum kilogram meter per second Kg ms
Energy oule N m
Power Watt W W s
Moment of force Newton meter N m
Kinematic viscosity s uare meter per second m s
Dynamic Viscosity Pascal second Pa s
Thermal conductivity Watt per meter Kelvin W m K
GENERAL INFORMATION International system of units
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AMERICAN UNIT CON ERSION FACTOR SI UNITPound masscubic feet kilogramscubic meterGallons per minute liters per minute lpmUS Gallon liter IPound force Newton NBTU British Thermal Unit oule BTU per hour Watt WBTU per pounddeg F oule kg Kmil Micrometer micronInches millimeters mmFoot meter mHorsepower kilowatt kWPounds per s uare inch bar bar kPaBTU per pound oule per kgLbs per gallon kg per liter kglS uare inch s uare centimeter cm S uare foot s uare meter m Acre hectares haFoot per second meters per second msecFoot per minute meters per minute mminMiles per hours kilometers per hour kmhKnots kilometers per hour kmhCubic foot cubic meter m Cubic inch cubic centimeter cm Pound kilogram kgTon metric ton t
UANTITDENSITYFLOW RATEFLUID VOLUMEFORCEHEATHEAT TRANSFERSPECIFIC HEAT CAPACITYLENGHTLENGHTLENGHTPOWERPRESSURECALORIC VALUE ENTALPYSPECIFIC WEIGHTSURFACESURFACESURFACEVELOCITYVELOCITYVELOCITYVELOCITYVOLUMEVOLUMEWEIGHTWEIGHT
Multiply American Units on the left (by the conversion factor) to obtain SI Units on the rightDivide SI Units on the right (by the conversion factor) to obtain American Units on the left
GENERAL INFORMATION Prefix tables for SI units
Prefixes
SI units can be indicated together with a prefi to easily indicate very large or very small numbersAs an e ample visible light has a wave length of appro imately m meters which can be more easily written as nm nanometersPlease note it is not allowed to use prefi es together you cannot write m da-km
0n Prefix Symbol Denomination Decimal e ui alent yotta Y zetta Z e a E peta P tera T giga G mega M Million kilo k Thousand etto h Hundred deca da Ten - deci d Tenth - centi c Hundredth - milli m Thousandth - micro Millionth - nano n - pico p - femto f - atto a - zepto z - yocto y
GENERAL INFORMATION Conversion table American units to Si units
NoteBecause of discrepancies between some denominations in English and American we only mention the commonly used deno-minations
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
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C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
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A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
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A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
wwwpnr-nozzlescom CTG SH 07 EU
LIQU
ID S
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
wwwpnr-nozzlescom CTG SH 07 EU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
wwwpnr-nozzlescomCTG SH 07 EU
Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
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AND
SPRA
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ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
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AND
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
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wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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Description
The INTERNATIONAL S STEM OF UNITS sometimes called SI has been defined by the International Standards OrganizationISO and is based upon metric units The following notes include most units which are likely to be used in handing of fluidsThe system consists of nine base units and supplementary units which are coherently derived from them The coherence con-sists in the fact that the product or the uotient of any two unit uantities in the system result in another unit uantityBecause of the world wide trend to use this modern metric system we are providing in the following the conversion constantsfor the most useful units
Base Units and deri ed units
The SI has defined the following base unit
GENE
RAL
INFO
RMAT
ION
N UANTIT UNIT NAME UNIT S MBOL
Length meter m
Mass kilogram kg
Time second s
Thermodynamic temperature Kelvin K
Molecular substance mole mol
Electric current Ampere A
Light intensity candela cd
Plane angle radiante rad
Solid angle steradian sr
Out of these base units many other have been derived the most interesting for our purposes being listed below
N UANTIT UNIT NAME UNIT S MBOL E UI ALENCES
Area s uare meter m
Volume cubic meter m
Density kilogram per cubic meter Kgm
Velocity meter per second ms
Acceleration meter per second s uared ms
Angular velocity radian per second rad s
Fre uency Hertz Hz Hz cicli s
Force Newton N N kg ms
Pressure Pascal Pa Pa Nm
Momentum kilogram meter per second Kg ms
Energy oule N m
Power Watt W W s
Moment of force Newton meter N m
Kinematic viscosity s uare meter per second m s
Dynamic Viscosity Pascal second Pa s
Thermal conductivity Watt per meter Kelvin W m K
GENERAL INFORMATION International system of units
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GENE
RAL
INFO
RMAT
ION
AMERICAN UNIT CON ERSION FACTOR SI UNITPound masscubic feet kilogramscubic meterGallons per minute liters per minute lpmUS Gallon liter IPound force Newton NBTU British Thermal Unit oule BTU per hour Watt WBTU per pounddeg F oule kg Kmil Micrometer micronInches millimeters mmFoot meter mHorsepower kilowatt kWPounds per s uare inch bar bar kPaBTU per pound oule per kgLbs per gallon kg per liter kglS uare inch s uare centimeter cm S uare foot s uare meter m Acre hectares haFoot per second meters per second msecFoot per minute meters per minute mminMiles per hours kilometers per hour kmhKnots kilometers per hour kmhCubic foot cubic meter m Cubic inch cubic centimeter cm Pound kilogram kgTon metric ton t
UANTITDENSITYFLOW RATEFLUID VOLUMEFORCEHEATHEAT TRANSFERSPECIFIC HEAT CAPACITYLENGHTLENGHTLENGHTPOWERPRESSURECALORIC VALUE ENTALPYSPECIFIC WEIGHTSURFACESURFACESURFACEVELOCITYVELOCITYVELOCITYVELOCITYVOLUMEVOLUMEWEIGHTWEIGHT
Multiply American Units on the left (by the conversion factor) to obtain SI Units on the rightDivide SI Units on the right (by the conversion factor) to obtain American Units on the left
GENERAL INFORMATION Prefix tables for SI units
Prefixes
SI units can be indicated together with a prefi to easily indicate very large or very small numbersAs an e ample visible light has a wave length of appro imately m meters which can be more easily written as nm nanometersPlease note it is not allowed to use prefi es together you cannot write m da-km
0n Prefix Symbol Denomination Decimal e ui alent yotta Y zetta Z e a E peta P tera T giga G mega M Million kilo k Thousand etto h Hundred deca da Ten - deci d Tenth - centi c Hundredth - milli m Thousandth - micro Millionth - nano n - pico p - femto f - atto a - zepto z - yocto y
GENERAL INFORMATION Conversion table American units to Si units
NoteBecause of discrepancies between some denominations in English and American we only mention the commonly used deno-minations
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
GENE
RAL
INFO
RMAT
ION S MBOL NAME MP BP NOTES
C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENE
RAL
INFO
RMAT
ION
GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
ID S
PRAY
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SPRA
Y NO
ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
PRAY
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
PRAY
AND
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
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SPRA
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ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
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IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
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IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
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IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
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IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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GENE
RAL
INFO
RMAT
ION
AMERICAN UNIT CON ERSION FACTOR SI UNITPound masscubic feet kilogramscubic meterGallons per minute liters per minute lpmUS Gallon liter IPound force Newton NBTU British Thermal Unit oule BTU per hour Watt WBTU per pounddeg F oule kg Kmil Micrometer micronInches millimeters mmFoot meter mHorsepower kilowatt kWPounds per s uare inch bar bar kPaBTU per pound oule per kgLbs per gallon kg per liter kglS uare inch s uare centimeter cm S uare foot s uare meter m Acre hectares haFoot per second meters per second msecFoot per minute meters per minute mminMiles per hours kilometers per hour kmhKnots kilometers per hour kmhCubic foot cubic meter m Cubic inch cubic centimeter cm Pound kilogram kgTon metric ton t
UANTITDENSITYFLOW RATEFLUID VOLUMEFORCEHEATHEAT TRANSFERSPECIFIC HEAT CAPACITYLENGHTLENGHTLENGHTPOWERPRESSURECALORIC VALUE ENTALPYSPECIFIC WEIGHTSURFACESURFACESURFACEVELOCITYVELOCITYVELOCITYVELOCITYVOLUMEVOLUMEWEIGHTWEIGHT
Multiply American Units on the left (by the conversion factor) to obtain SI Units on the rightDivide SI Units on the right (by the conversion factor) to obtain American Units on the left
GENERAL INFORMATION Prefix tables for SI units
Prefixes
SI units can be indicated together with a prefi to easily indicate very large or very small numbersAs an e ample visible light has a wave length of appro imately m meters which can be more easily written as nm nanometersPlease note it is not allowed to use prefi es together you cannot write m da-km
0n Prefix Symbol Denomination Decimal e ui alent yotta Y zetta Z e a E peta P tera T giga G mega M Million kilo k Thousand etto h Hundred deca da Ten - deci d Tenth - centi c Hundredth - milli m Thousandth - micro Millionth - nano n - pico p - femto f - atto a - zepto z - yocto y
GENERAL INFORMATION Conversion table American units to Si units
NoteBecause of discrepancies between some denominations in English and American we only mention the commonly used deno-minations
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
GENE
RAL
INFO
RMAT
ION S MBOL NAME MP BP NOTES
C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENE
RAL
INFO
RMAT
ION
GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
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A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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ZZLE
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
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LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
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wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
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f langes to ANSI norms
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PIPI
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Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
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in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
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Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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There are principal types of temperature scales used for indicate the temperature CENTIGRADE CELSIUS FAHRENHEITKELVIN and RANKINE Kelvin and Celsius scales are used in Europe Rankine Fahrenheit are used in Anglo-Sa ons countries
MP water melting pointBP water boiling point
GENE
RAL
INFO
RMAT
ION S MBOL NAME MP BP NOTES
C Centigrade and are arbitrarily placed at the freezing point andboiling point of water
F Fahrenheit
F is the stabilized temperature when e ual amounts ofice water and salt are mi ed F is the temperature when the thermometer is held in the mouth or under thearmpit of a living man in good health
K Kelvin Based upon the definitions of the Centigrade scale and thee perimental evidence that absolute zero is Cand that is an international standard temperature point
R Rankine Based upon the definitions of the Fahrenheit scale andthe e perimental evidence that absolute zero is C
C F
C F
C F
C F
C F-
-
-
-
-
CON ERSION FORMULAE TABLE
CELSIUS FAHRENHEIT KEL IN RANKINE
C -F -
K - R
-
F C )K - R -
K C F -
- R
R C F )K -
GENERAL INFORMATION Conversion table temperature scales
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GENE
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GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
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A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
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AND
SPRA
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
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AND
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S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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AND
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
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ZZLE
S
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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GENE
RAL
INFO
RMAT
ION
GENERAL INFORMATION Metric and decimal equivalents of fractions of an inch
mm FRACTIONS OF ONE INCH INCHES
03969079375119061587519844238125277813175035719396875436564762551594555625595316350067469714375754067937583344873125912819525099219
1031875107156111125115094119062512303112700013096913493751389061428751468441508125154781158750162719166687517065617462517859418256251865311905001944691984375202406206375210344214312521828022225022621923018752341562381252420942460625250031254000
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
732 0218751564 0234375
141764 0265625
932 0281251964 029687
516 031252164 0328125
1132 0343752364 0359375
38 03752564 0390625
1332 0406252764 042187
716 043752964 0453125
1532 0468753164 0484375
123364 0515625
1732 0531253564 054687
916 056253764 0578125
1932 0593753964 0609375
58 06254164 064062
2132 0656254364 0671875
1116 068754564 0703125
2332 0718754764 0734375
344964 0765625
2532 0781255164 0796875
1316 081255364 0828125
2732 0843755564 085937
78 08755764 0890625
2932 0906255964 0921875
1516 093756164 0953125
3132 0968756364 0984375
1
mm FRACTIONS OF ONE INCH INCHES
03969 164 0015625132 003125
364 004687116 00625
564 0078125332 009375
764 010937518 0125
964 014062532 015625
1164 0171875316 1364 01875
0203125732 021875
1564 0234375025
1764 0265625932 028125
1964 029687516 03125
2164 03281251132 034375
2364 035937538 0375
2564 03906251332 040625
2764 042187716 04375
2964 04531251532 046875
3164 048437505
3364 05156251732 053125
3564 054687916 05625
3764 05781251932 059375
3964 060937558 0625
4164 0640622132 065625
4364 06718751116 06875
4564 07031252332 071875
4764 0734375075
4964 07656252532 078125
5164 07968751316 08125
5364 08281252732 084375
5564 08593778 0875
5764 08906252932 090625
5964 09218751516 09375
6164 09531253132 096875
6364 098437510
mm FRACTIONS OF ONE INCH INCHES
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
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A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
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B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
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LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLESLiquid spray 9Spray nozzle types 11Spray nozzle coding 13Computerized fluid dynamics 14Spray generation 15Droplet spectrum 16Nozzle flow rate 19Spray angle 21Spray distribution 23Influence of liquid viscosity 27Influence of liquid specific gravity 29Jet impact 30Pressure drop through a nozzle 32
LIQUID SPRAY AND SPRAY NOZZLESLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
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A nozzle is a device which converts the energy from a fluid into velocity of the spraydropletsApplications in many industrial processes are numberless with spray nozzles being veryoften a critical component in determining the final uality of the product or the efficiencyof the processFor this reason the available nozzle range types for industrial applications can be foundin PNR nozzle catalogue as well as a concise but complete information about the mostimportant parameters which can give a technical definition of a spray and its ualityWe have grouped in the following the most useful formulas for designing a spray systemshowing the influence of the different factors which can affect the process of sprayingMore information about the working life of a nozzle and the best suited material for a givenpurpose can be found at page of this publicationAlI the following data when not otherwise specified refer to spraying water at C
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
LIQU
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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LIQU
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
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ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
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AND
SPRA
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
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S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
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SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
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AND
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ZZLE
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
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A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
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B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
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LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
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NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LI UID SPRA AS A PROCESS
The process of spraying a li uid can be described as composed of two phases namely
Breaking up the li uid into separated drops Directing the li uid drops onto a surface or an object to achieve the desired result
The above two phases are normally performed by the types of nozzles being used in industrial processes at the same time bymeans of different techni ues which shall be illustrated in the followingThe continuous progress in the manufacturing techni ues in recent years has re uested the nozzle manufacturer to make availableto the industry an always more complete range of spray nozzle types to perform the different processes in a more efficient wayIt is the interest of the engineer using spray nozzles in manufacturing processes to become familiar with the different types ofnozzles which are available today and with their individual characteristics in order to be able to choose the nozzle which performswith the highest possible efficiency on a given application
Spraying a li uid through a spray nozzle can serve different purposes among which the most important are the following
Cooling by means of heat transfer between the product itself and the li uid running on its surface Washing where the water directed onto the product takes away dirt or undesired substances from the product surface Humidifying with sprays carrying very little li uid uantities to the product surfaceinto a chamber or into a room Metering the desired li uid uantity in a unit of time into the product being handled Applying a product on a surface as in the case of spray painting or surface pre-treatment before painting Increasing the li uid surface to speed up heat transfer processes or chemical reactions and many others in numerousapplications throughout modern industry
It is self evident that the best results for every application are only obtained when the right choices in terms of nozzle type flowvalue spray angle drop dimensions and nozzle material are madeThe purpose of the following pages is to give the reader the basic knowledge which is needed to properly select a spray nozzlefor a given application
Spray nozzles
a spray nozzle is a device which makes use of the pressure energy of a li uid to increase its speed through an orifice and breakit into dropsIts performances can be identified and described precisely so that the design engineer can specify e actly the spray nozzlere uired for a given process
The relevant characteristics which identify the performances of a nozzle are the following
The li uid flow delivered as a function of the nozzle feed pressure The opening angle of the produced spray The nozzle efficiency as the ratio between the energy of the spray and the energy used by the nozzle The evenness of the flow distribution over the target The droplet size distribution of the spray The jet impact of the spray
The above characteristics will be discussed in the following pages in connection with the different nozzle types
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TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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LIQU
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PRAY
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
ID S
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ZZLE
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
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ZZLE
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
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SPRA
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
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IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
TECHNI UES FOR SPRA PRODUCTION
Many different techni ues can be used to produce a spray and most of them are used today for nozzles to be applied in industrialprocesses Based on the different techni ues the following nozzle types can be used in industrial applications to generate a li uidspray
Pressure nozzlesThis is the simplest type of nozzles where an orifice is opened into a chamber where the li uid to be sprayed is fed underpressure A spray is produced through the orifice with spray pattern flow rate and spray angle depending upon the orificeedge profile and the design of the inside pressure chamberTypical pressure nozzles are the flat jet nozzles series GA G and GY
Turbulence nozzlesIn these nozzles the li uid moving towards the chamber preceding the orifice is given a rotational speed component soas to open up in a conical shape as soon as it leaves the orifice edge because of centrifugal force Based on the nozzledesign and the techni ue used to generate the rotational speed the drops produced can be confined to the cone outersurface hollow cone spray or be evenly distributed to fill the entire volume of the cone full cone spray
Impact nozzlesHere the desired spray shape is obtained producing an impact of the li uid jet onto a properly designed surface The li uidjet is subse uently changed into a fluid lamina and then broken into drops with the desired spray pattern after leaving thenozzle edge
Air assisted atomizersFine and very fine sprays can be obtained by means of air assisted atomizers working upon various different principlesMore detailed information about air assisted atomizing can be found in our Catalogue Air assisted atomizers orderingcode CTG AZ
LIQUID SPRAY AND SPRAY NOZZLES Liquid spray
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LIQU
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AND
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ZZLE
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FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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LIQU
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
ID S
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ZZLE
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
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ZZLE
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
FULL CONE PATTERN
In a full cone spray the droplets are distributed into a volume which is limited by a cone having itsorigin point at the nozzle orifice Such spray pattern is commonly used in a large variety of industrialprocesses since it is the one which allows to distribute in an even way the water flow onto a surfacethe full cone spray pattern is therefore useful as a typical e ample to evenly spray cooling li uidon a still surface Another typical use is to distribute li uid droplets within a certain volume like fore ample evenly distributing water droplets in the inside volume of a cooling tower
Because of the wide number of processes performed by means of full cone nozzles the originalshape has evolved into a range of specialised types where the full cone spray pattern or a patternsimilar to a full cone one is obtained by different techni ues
Standard full cone turbulence nozzleThese nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational speed tothe fluid flowing through the nozzleBecause of the rotational speed of the fluid water e iting the nozzle orifice is subjected to centrifu-gal force and opens up in the shape of a full coneThe e tent of the angle of the cone is a function of both e it speed created from the inlet pressureand the internal design of the nozzle It can vary in practice from to
These nozzles can be also produced as s uare full cone nozzles where the s uare shape of thepyramidal spray is obtained by a special design of the outlet orificeTwo important details have to be noted from the system designer when using these type of noz-zles
the spray angle is measured on the side of the s uare section the s uare section of the spray rotates within the distance from the nozzle orifice to the target area
Spiral full cone deflection nozzleThis is not properly a full cone but rather a continuous li uid curtain evolving with the shape of aspiral inside a conical volume The disadvantage of a scarcely even distribution is compensatedby an e ceptionally good resistance to plugging which makes this nozzle the best choice in thoseapplications where safety or system reliability are the prime concern eg fire fighting systems
Multiple full cone turbulence nozzle air atomizerThis spray pattern is used in two cases that is
When a wide spray angle is to be reached with nozzles which inherently can only produce anarrow one or in such cases where small size droplets and rather high capacities are re uiredTherefore several nozzles are grouped in a cluster with different spray directions the resultingspray pattern occurs from the additional group of single nozzle sprays and the droplet size ofthe spray remains the same as one of single nozzle It must be noted that a smaller nozzle willnormally make smaller drops as compared to a larger size nozzle of the same type operatingunder the same conditions
When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a lim-ited angle spray In the case of a wide angle air atomizer for e ample the droplet distributionis obviously not homogeneous and the result is rather a number of small angle sprays withdifferent directions but still the li uid is atomized towards all the parts of the volume to betreated
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle types
Standard full cone
Spiral full cone
Multiple full cone
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
ID S
PRAY
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SPRA
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ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
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SPRA
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ZZLE
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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FLAT ET SPRA PATTERN
In a flat jet spray the li uid droplets are sprayed in the shape of a flat li uid layer with differentthickness according to the principle used to generate the spray A flat jet spray nozzle serves thepurpose of spraying onto a surface or an object moving in a transverse direction with respect to theone of the jet surface a typical e ample being the nozzles in a car washing tunnel The vast majorityof flat spray nozzles used in the industry work according to one of the following principles
In line flat et pressure nozzleThis is the general purpose flat jet nozzle where the li uid enters the nozzle in line with the a islength and is fed to a pressure chamber from where it is ejected through the nozzle orifice Flowvalue and spray angle are determined respectively from the orifice cross section and the orificeedge profile
In line straight et pressure nozzleThese nozzles can be considered a special kind of flat jet nozzle with naught degree spray angleThey are designed to produce a sharp stable stream with powerful impact on a given point andserve normally to perform cleaning processes or to cut soft materials
Spoon flat et deflection nozzleIn this type of nozzle the li uid is fed under pressure to a round outlet orifice and then deflectedonto a smooth profiled surface so as to assume a flat jet shape This sophisticated design is ofadvantage since it offers a stronger jet impact using the same feed pressureHigher efficiency comes from the very little energy re uired to just change the direction of the li uidflow this being the only energy re uired to generate the flat jet
HOLLOW CONE SPRA PATTERN
A hollow cone spray pattern consists of droplets concentrated onto the outer surface of a conicalshape volume with no droplets contained in the inside of the conical jet shape These nozzles arenormally used for smoke washing or gas cooling applications in several industrial processes
Hollow cone turbulence nozzleThese nozzles use a tangential injection of li uid into a whirling chamber to generate centrifugalforces which break up the li uid vein as soon as it leaves the orifice Precisely designed orificeprofiles making use of the Coanda effect provides the ability to obtain very large spray angles
Hollow cone deflection nozzleA hollow cone can also be obtained taking a li uid flow to change direction onto a properlydesigned surface in order to break the li uid into droplets and distributing them as a hollow conespray patternThis kind of nozzle is mainly used for applications in dust control and fire fighting systems
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle typesLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
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A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
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B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
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LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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PNR CODING S STEM
As any other industrial product spray nozzles need to be precisely identified by means of a code in order to avoid mistakesPNR coding system has been designed with the following re uirements in mind
Codes must be easily processed by a computer in ascending order Codes must describe completely the product without any need for additional description Codes must show to the user the basic specifications of the nozzle in order to ease the search in the catalogue
We have therefore determined our coding system described as follows
LIQUID SPRAY AND SPRAY NOZZLES Spray nozzle coding
LIQU
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AA U 0 B
Thread type or other connection
Special features
Nozzle material code see below
The three digits give the nozzle capacity in lpm at baraccording to rank value
Rank of flow value see table below
Nozzle spray angle see table below
Nozzle type as described in the catalogue pages shownin ascending order
Nozzle tables report on a blue background the nominal flowvalue measured at barFlow values at different pressures have been calculated
These codes serve as an indication onlyBased on different types of nozzles their significance canoccasionally be different
CAPACIT RANK
Rank Flow digits Actual flow lmin
SOME SPRA ANGLE CODES DEGREES
A L T
B M U
C N
D W
F R Y
H S Z
A Carbon steel D Glassfibre reinforced PP L Incolloy 825
A High speed steel D7 High density polyethilene L Hastelloy C276
A Zinc coated steel D Polyvinylidenefluoride (PVDF) P Acr But Styrene (ABS)
A Nickel coated steel E0 EPDM P EPDM 40 Shore
B AISI 303 Stainless steel E Polytetrafluorethylene (PTFE) T Brass
B AISI 304 Stainless steel E PTFE (25 glassfibers) T Brass chrome plated
B AISI 304 L Stainless steel E Acetalic resin (POM) T Copper
B AISI 316 Stainless steel E7 Viton T Bronze
B AISI 316 L Stainless steel E Synthetic rubber (NBR) T Brass nickel plated
C AISI 416 Stainless steel hardened F Ceramic T Brass electroless nickel plated
D Polyvinylchloride (PVC) F Ruby insert 303 body Aluminum
D Polypropylene (PP) G Cast iron 7 Aluminum electroless n plated
d Polyamide (PA) H Titanium
D Talcum filled Polypropylene L Monel 400
NOZZLE MATERIAL CODES
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
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AND
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S
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LIQU
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
ID S
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AND
SPRA
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S
LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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LIQU
ID S
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AND
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
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AND
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
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AND
SPRA
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ZZLE
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
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ZZLE
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wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLES Computerized fluid dynamics
The customers demand for an always higher efficiency re uires to use not only the best tooling but in addition controlinstruments and design methods always more sophisticated like for e ample new software for obtaining the velocitydistribution of a fluid flowing through a conduit
These software programs re uirethat the geometry of the inner con-duit to be geometrically defined andin addition the process conditions pressure temperature fluid capacity and the fluid properties specificweight viscosity to be Introduced
Based on the above data it is pos-sible to obtain a very precise dis-tribution for the velocity value ineach single point of the conduitboth under numeric form and flowdiagramsThese Information make it possi-ble as an e ample to minimize theflow turbulence and conse uentlyto Increase the nozzle efficiencythrough an increase in the fluid e itvelocityThis is of basic Importance for somekind of nozzles for e ample thosenozzles re uired to supply an highimpact jet when performing descal-ing processes in a rolling millBy trial and error it is also possible toeliminate problems like jet Instabilityor cavitation
The overall process efficiency in theflow path before the nozzle can alsobe considered which often resultsinto the design of geometry modifi-cation or the Introduction of specialflow improving profiles along theconduit
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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LIQU
ID S
PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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LIQU
ID S
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SPRA
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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ZZLE
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
wwwpnr-nozzlescomCTG SH 07 EU
Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
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LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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The diagram on the right shows the idealization of the process generating the droplets while the water jet e iting thenozzle is breaking upThe theoretical model whose e actitude seems to be confirmed by scientific research considers that the li uid flowingthrough the nozzle and past the orifice edge evolves into a li uid laminaThis lamina because of instability induced by aerodynamic forces breaks up first into elongated ligaments more or lesscylindrical and later into droplets
Taking the above process as a guideline one can easily appreciate that the average droplet diameter is some what relatedto several factors like
The thickness of the lamina itself The evenness of the lamina A steady flow and break up process
For what has been said above and limited to hydraulic nozzles the system designer looking for fine droplet sprays shouldconsider that the following results can be e pected
Impact nozzles best
Centrifugal hollow cone nozzlesmultiple full cone nozzles good
Turbulence nozzles fair
Centrifugal Vaneless full cones worst
The above choice is obviously based on the droplet generation process which changes from one nozzle type to anotherand allows to forecast which type is best fro the applicationAn additional consideration of interest is that the e pected droplet size changes for the same type of nozzle with thenozzle size it is possible to generate smaller drops spraying the same water uantity at the same pressure using a greaternumber of smaller nozzles
In cases where energy re uirements are not a problem or where a specified small droplet diameter is re uired the smal-lest droplets can be obtained by means of an air assisted atomizerHere the shear action of a high speed compressed air flow is used with several different techni ues to obtain a value forSMD Sauter Mean Diameter of microns and less
LIQUID SPRAY AND SPRAY NOZZLES Spray generation
Theoretical Mechanismof droplet generation
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
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A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
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B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
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NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
The atomization of a li uid by means of a compressible fluid like air steam or a gas is defined pneumatic two-phase or twin-fluid atomization Many industrial processes re uire the availability of finely atomized droplets and the techni ues to produceatomized jets have been largely improved in the recent years In addition more sophisticated process techni ues have incre-ased the demand for a precise definition about the characteristics of the spray and are now available to the design engineerSince many years PNR can supply upon re uest complete documentation containing test reports about the more interestingand additional information which are described below for all PNR products
Laser Interpherometer Test By Pdpa
PNR droplet size test reports are performed by means of a Laser Interpherometer Phase Doppler Particle Analyzer wheretwo laser beams cross in a given point of the spray and define a test probe area Droplet flying through the probe area causea light scatter which is picked up by the instrument receiver and processed through a computer in order to obtain relevantinformation about the spray characteristics
Report information
Report information is made of data printed on three pages where the first page contains the most interesting data whichmake possible to base process calculations upon precise data about spraying degrees process efficiency and jet behaviorin operational ambiance These pages contain the Sauter Mean Diameter value whose knowledge is of special importance inheat e change calculations about evaporative gas cooling processes since it gives the possibility of evaluating the e changesurface obtained by atomizing for a given li uid volume
The upper picture at page referring to atomizing water by means compressed air shows two following histograms
Distribution curve of droplet diameter micron
Distribution curve of droplet velocities mps
and the below described values
Arithmetic Mean Diameter D
Surface Mean Diameter D
Volume Mean Diameter D
Sauter Mean Diameter D
ARITHMETIC MEAN DIAMETERThis is a diameter value which multiplied by the local num-ber of droplets in the sample e uals the addition of alIdroplets diameters
SURFACE MEAN DIAMETERThis is the diameter of such a droplet whose surface mul-tiplied by the total droplets number e uals the sum of alIdroplets surfaces
VOLUME MEAN DIAMETERThis is the diameter of such a droplet whose volume mul-tiplied by the total droplets number e uals the sum of alldroplets volumes
SAUTER MEAN DIAMETERThis is the diameter of such a droplet whose volumearearatio e uals the ratio between the sum of alI droplet volu-mes divided by the sum of alI droplet surfaces
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi n i
D vi n i d i
vi d i
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
wwwpnr-nozzlescom CTG SH 07 EU
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
wwwpnr-nozzlescom CTG SH 07 EU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
wwwpnr-nozzlescomCTG SH 07 EU
Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
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AND
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S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
wwwpnr-nozzlescomCTG SH 07 EU
Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
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AND
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
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AND
SPRA
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
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wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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AttemptsDroplet number crossing probe area during test time This includes both validated and not validated droplet
Correct Count CriteriaA mathematic correction is applied to validate droplets which cross Probe Area in a peripheral belt or to droplets withouta perfect spherical shape so that alI validated droplets parameters are homogeneous This correction is necessary sothat there is direct proportionally between laser beam phase and droplet number diameter
Number DensityIt is the number of droplets passing through probe area within test time
Probe areaThis is the area where the two laser beams are crossing so determining the probe area AlI droplets intersecting probearea are checked droplets which respect given parameters for shape are taken as valid droplets and make up the samplewhose size and velocity parameters are reported
alidationsDroplets accepted based on given shape parameters to make up for test sample
elocity MeanDroplets distribution speed histogram ms
olume Flow RateIt is the volume measured in cubic centimeter per second of the validated droplets making up for the sample
olume FluxIt is the flow rate per specific area measured in cubic centimeter per second and s uare centimeter of the validateddroplets making up the sample
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ID S
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LIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
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SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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ID S
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S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
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AND
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Droplet spectrum
PNR can supply upon re uest complete documentation con-taining test reports about the aforementioned parameters andadditional information for all PNR atomizersThe diagrams beside show the distribution of droplet diametersand droplet velocities of a spray under test as available to ourcustomers
In the photo beside a test being performed at our laboratoriesWe use a computer driven laser interpherometer to detect andrecord the spray parameters while fluid capacities and feedpressure values are monitored through high precision instru-ments
IMPORTANT NOTE
The droplet size values measured with a PDPA instrumentation are representative of a well specified volume inside the sprayand taking measurements in a different volume they can be considerably differentA correct spray droplet size characterization re uires then not only tests being performed in several volumes within the spraybut also that those measure volumes are selected with regard to the process the droplets are e pected to performAs an e ample the droplet characterization of a spray should define how many volumes have been tested and which are thecoordinates of each single test volume in relation to the nozzle orifice
Most of the times pretending to describe the droplet spectrum of a spray nozzle at a given pressure with only one diagram istherefore not correct
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
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LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
wwwpnr-nozzlescom CTG SH 07 EU
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
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LIQUID SPRAY AND SPRAY NOZZLES Spray angle
wwwpnr-nozzlescom CTG SH 07 EU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
wwwpnr-nozzlescomCTG SH 07 EU
Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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wwwpnr-nozzlescomCTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
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AND
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S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
wwwpnr-nozzlescomCTG SH 07 EU
Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
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wwwpnr-nozzlescom CTG SH 07 EU
iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
wwwpnr-nozzlescomCTG SH 07 EU
With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
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AND
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wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
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AND
SPRA
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
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wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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In order to calculate the discharge flow rate from a given nozzle theBernoulli law shall be used which says that the energy of a li uid flowremains unchanged over alI the sections of the flow Friction and turbu-lence losses are neglected which is reasonable for our purposes if the cal-culation is performed over two sections not too far away from each other
The Bernoulli law can be written as follows
Therefore if we consider two sections of the same pipe section A and section B we can write that the flow energy remainsconstant in the form
If we finally consider that the two above sections are taken immediately before and immediately after the nozzle outlet orificebeing
ZA ZBPB PA is a differential pressure referred at the atmosphere pressure
VA Agrave negligible as compared to VB for orifice diameter much smaller than the duct diameter
we shall come to the formula
When we define a new constant k to include the value of the nozzle orifice outlet area A then we come to the followinge uation which says that for a nozzle spraying into a room at ambient pressure the e iting flow is proportional to the feed linepressure
Considering now two different pressure values for the same nozzle since k is a constant uantity we can write that
and derive from the above an e uation that makes it possible to calculate the nozzle flow value at any given pressure valueonce the flow value at another pressure value is known
The energy of a given li uid flow crossing a given pipe section is composed of three parts namely
P Pressure energy of li uid particle per volume unit
laquoV Kinetic energy of li uid particle per volume unitlaquogz Potential Energy of li uid particle per volume unit
Where laquo density of li uid g gravitational acceleration
z height respect to one plane of reference V li uid velocity
PA laquoVB
Egrave
K EgraveP
K
EgraveP P
A V Egrave A C P Egrave
P laquoV laquogz E
VB ) PA Egravelaquo
P
P
V C P
K P
PA laquoVA
laquogzA PB laquoVB laquogzB
E IT VELOCITYDEPENDS PONPRESS RE
NO LE CAPACITYDEPENDS PONPRESS RE
NO LE CAPACITYAT A DIFFERENTPRESS RE
P
P
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescom CTG SH 07 EU
E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
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S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
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SPRA
Y NO
ZZLE
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
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IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Nozzle flow rate
The E uation has been obtained after having simplified the real problem neglecting several factors like for e ample In most of the practical application cases the flow is turbulent and not laminar Friction losses tend to strongly increase with li uid velocity Depending upon the type of nozzle a different percentage of the available energy is used to break up the jet and give the
desired spray pattern and spray angle
For the above reason e uation gives reliable results if used in a limited pressure range around the pressure value where theflow rate is known with this pressure range depending upon the type of nozzleOur e perience has shown that one can e pect the error in the calculated value to be lower than - for pressure valuesranging from to times the reference value
As an e ample a nozzle rated for lpm at bars would have according to e uation the following flow valuesa bar lpma bar lpmin real conditions it can be e pected the flow rate values to beas high as lpm a baras low as lpm a barAbove considerations are to be used as a guideline only because of the many factors influencing real operations which havenot been considered here for e ample li uid temperature viscosity and density
Possible percentage de iation from theoretical flow rate alues
Also above mentioned percentage errors have to be understood for nozzles using part of the flow energy to produce wideangle spray patternsLower values can be e pected for narrow angle nozzles impact nozzles and straight jet nozzlesLaboratory tests and diagrams showing real flow rate values for each nozzles are used in practice when a precise result mustbe available
Nozzle discharge coefficient
With reference to e uation if we consider the pressure value to be e ual to P bar the flow rate of the nozzlebecomes
K is a parameter widely used in the fire fighting industry
In some instances reference is made to the nozzle discharge coefficient or shortly to the nozzle coefficient to indicate the nozzleflow rate for a unitary pressureOf course for a given pressure value Pn the flow value will be
CAPACITY AT A IVENPRESS RE VAL EW EN OWN
NO LE CAPACITYFOR P bar K P K K
n K Pn
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
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SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
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AYAN
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RAY
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
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A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
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B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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The spray angle is the opening angle which the nozzle jet of droplets forms at the moment when it leaves the nozzle orificeand it is one of the fundamental parameters for the choice of a given nozzleIn fact the amplitude of the spray angle determines in connection with the distance between the nozzle orifice and the targetto be covered the spray coverage and the density of li uid sprayed with respect to the cover area See our Catalogue fordescription of the different nozzle spray patternsThe table at the bottom of the page gives the theoretical spray width based on the nozzle spray angle and the distance fromthe nozzle orificeIt is important to note that because of several factors like gravity forces and aerodynamic drag the spray angle value cannotbe maintained but in in a limited distance normally up to mm from the orificeFor air assisted atomizers it is improper to use the term spray angle since no precise value can be measured Therefore thevalues given by Catalogues are to be intended as guidelines only
THEORETICAL SPRA CO ERAGE
at arious distances from nozzle orifice
Spray 0 00 0 00 0 00 00 00 00 700 00 000Angle mm mm mm mm mm mm mm mm mm mm mm mm
Where ASC Actual Spray Coverage TSC Theoretical Spray Coverage ASA Actual Spray Angle TSA Theoretical Spray Angle L Spray Distances
TSC L ctan TSA
7
LIQU
ID S
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AND
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ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray angle
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LIQU
ID S
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AND
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
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AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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PRAY
AND
SPRA
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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ID S
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ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray angle
Depending upon the nozzle design variations of feed pressure may have a great influence on the spray angle valueGenerally with increasing pressure turbulence full cone nozzles will produce narrower angles flat jet nozzles will show a widerangle spray while nozzles working on the deflection principle like spiral nozzles and K style flat jet nozzles will be less affectedby pressure changesAll nozzles will not function properly with very low pressure values from bar down depending upon nozzle type with amarked decay in performance larger drops not well defined spray pattern lower spray angle values
The above pictures show spray angles for different nozzles and different pressure valuesShould your application strictly re uire that a given value of the spray angle is obtained under a given pressure value or pressurerange of values please obtain a test report from our laboratories
Full cone nozzeDDW
Flat jet nozzle CW
Spiral nozzeECW
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Pressure bar Pressure bar Pressure bar
Photo obtained with s flashlight
picture
picture
picture
picture
picture
picture
picture
picture
picture
NotePicture shows clearly the droplet generation mechanism as described at page
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
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AND
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
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AND
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S
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NOZZ
LE M
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
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IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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Terms and definitions
A very important characteristic of a spray nozzle is a parameter called Spray Distribution which gives a precise informationabout how evenly the drops of the spray are distributed onto the area covered by the sprayIt is self understood that normally it is preferable to obtain the most even distribution possibleIn the past this was done through the visual e amination of a diagram reporting the uantity of water contained for e ample inglass pipes aligned onto the spray coverage areaPnr has determined to obtain such a result in a scientific way through high technology instrumentation as shown in the picturesbelow showing one of our patternators and a typical distribution diagram
Now to the spray geometry and some definition let s consider a nozzle with a capa-city at the pressure PAt every value for distance H which we call height of spray we can define a plane n normal to the nozzle a is on which a line can define the intersection of the sprayonto the planeThe area covered by the spray on the plane n has a surface S depending from thefollowing parametersa Spray pattern Fb Opening angle of the spray αc Height of the spray H
We can then write S S F αH
In case of a full cone nozzle S is a circle with diameter C and S 07 C
The capacity of the nozzle flows through the surface S but each smaller area insidethe surface S will probably have a different value for the flow passing through itWe introduce then the value of Specific Capacity
Specific Capacity
The function depends upon the single point y in the section S and then
Determining the function is however very e pensive therefore in practice two different functions are used which give in mostoccurrences sufficient information
Linear Distribution
Angular distribution
partQpart x
Diagram
limΔS 0
ΔQΔS
partQ f y partS
partQpartφ
φ
Δ is the li uid flowing through a surface ΔSwhere ΔS is a fraction of the surface S
and y are the local coordinates in the section planewhere
H is the distance of the test surface from the nozzle orifice
I is the variation in capacitywhere I x is the variation of a generic linear coordinate
I is the variation in capacitywhere Iφ is the variation of a generic angular coordinate
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
LIQU
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
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ZZLE
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
wwwpnr-nozzlescomCTG SH 07 EU
Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Values e tracted from these functions can characterize the spray and allow for drawing the diagrams defined as DistributionCurves
Analyzing the above curves it is possible to determine the type of water distribution along the spray coverage and the type ofspray pattern like for e ample a full cone hollow cone flat or straight jet spray
Distribution measurement
The water distribution along the spray coverage is determined by means of an instrument called Patternator
A patternator consists of the following parts Li uid collector Cell block Measure block Unloading block
The nozzle is above the instrument and it is orienta-ted in such a way the jet is collected into the upperli uid collectorThe li uid collector can be linear diagram orround diagram according to the test being runFrom the single parts in the collector the li uid issent into the corresponding cells below
The Measure block determines the li uid content in each single cell then the unloading block empties the instrumentsending the li uid to the collection drain
There are two types of patternators
Analogic the different levels of li uid is visible through the transparent walls of the cells or pipes sometimes containingsome kind of floating balls and a picture can be taken with a camera
Digital Delivering an automatic reading of the values in the cells the values being supplied as an electronic file from whicha distribution curve can be easily obtained
Diagram Linear distribution Diagram Angular distribution
Diagram
Diagram Circular collectorDiagram Linear collector
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
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ZZLE
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
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ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
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SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
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LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
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NOZZ
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The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
Normalizing distribution cur e
The values obtained from the cells of the patternator showing the water uantity collected in the single cells allow for preparinga Distribution curve which can be given as a single line curve or as a row of vertical barsThese resemble the li uid level collected into the glass pipes of the old type instrumentation
The curves prepared based on the li uid level in the single cells still are not precise they depend in fact from the testing timethe longer this time the larger the li uid uantity sprayedTo eliminate the influence of time from the test it is necessary to transform the effective curves to normalized curves
Normalized linear
distribution
Normalized angular
distribution
Please note that a imum value is the one belonging to the series of values measured in the cellsIn addition to the distribution it is possible to normalize the intervals to with the following formulas
Normalized linear
inter al
Normalized7 angular
inter al
The linear normalized amplitude is defined inside an interval - The angular normalized amplitude is defined inside an interval π
Diagram Effective linear distribution curve Diagram Effective angular distribution curve
Mx
qxiexclx 8q
NScurren 8
2L
Diagram Normali ed linear distribution curve Diagram Normali ed angular distribution curve
is the linear distribution of a generic cellwhere
M is the ma imum linear distribution measured
where φ is the linear distribution of a generic cell φ
M is the ma imum linear distribution measured
is the normalized linear amplitude of the spraywhere
N is the number of active cellsactive cells cells containing li uid
where π is the normalized angular amplitude of the sprayN is the number of active cellsactive cells cells containing li uid
qM
q
szlig
szligiexclszlig 8φφ
φ
2
NSsect 8
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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E aluation of spray distribution
To evaluate distribution curves it is necessary to take three properties into consideration
a UNIFORMITY b MONOTONY c SIMMETRY
As described in the following diagrams and definitions
a UNIFORMA distribution that minimizes the ratio AA
b MONOTONEIs a distribution with a curve which growson the left side and decreases on the left side
c S MMETRICIs a distribution which minimizes theRatio A A-
Based on the above definitions the following curves show the ideal situations
The three properties are then evaluated by means of the following parameters
Integral uniformity
Incremental uniformity
Symmetry index
Complete details about the above formulas and definition can be found in our Technical Bulletin REL which shall bereleased from our Technical Department on re uest
Diagram Normali ed and monotone distribution
Diagram Normali ed and monotone distribution
Diagram Ideal monotony
Diagram Ideal symmetry
Diagram Ideal uniformity
A 1001 8 acute
AM
U
1002
2 8 Uacute acute
notU
1001 ocirc times
OumlograveOtilde
8 Ocirc
YUacute acute
Uacute
iexclagrave
NI S
Uacute 8 J M Y agrave i
iexcl iexcl i
A is the area included in the normalized curvewhere
A is the rest of the area included in the rectangle
Left side is the area - where
Right side is the area
A is the area included below the curve on the right sidewhere
A- is the area included below the curve on the left side
where
whereδ is the value of normalized li uid content in the symmetric cellN number of cells containing li uid in half of the diagram
Uacute
Uacute 8 JN
Ni i
iexcl
iexcl N Number of cells containing li uid
A area included below the curveAM area included below the ideal curve
where
J Ynot Uacute 8 N
1i iexcli iexcli
N Number of cells containing li uid
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Spray Distribution
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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Li uids are characterized for their property of undergoing continuous deformation when subjected to shear stressThe property of fluids li uids or gases to resist flowing due to the e istence of internal friction within the fluid is called visco-sity
Thus if we imagine the different layers of fluid sliding one over the other with friction we can imagine that viscosity is definedthe force re uired to move a unit area of fluid for a unit distance Viscosity is measured with many different systems amongwhich the most used are the following
The following table shows correspondences between the most used viscosity units
The viscosity value of a li uid depends upon the temperature therefore the viscosity value must always be given with referenceto a temperature valueThe viscosity of water C is Centipoise and Centistoke since water mass density
KINEMATIC SA BOLT SA BOLT ENGLER ISCOSIT UNI ERSAL FUROL
Centistoke S feetsec SSU SSF Degrees
---
---
---
---
---
---
---
METHOD UNIT DIMENSIONS NOTES
Dynamic viscosityAbsolute viscosity Poise ML T- Poise Centipoises dyne per seccm
Kinematic viscosity Stoke L T- Stoke Centistoke cm secKinematic viscosity Dynamic viscositydensity
SSUSSF
One of the most widely instruments to determine is the Saybolt viscosimeter which measuresthe time in seconds re uired for a fi ed volume of a given li uid to flow through an orificeSSU Seconds Saybolt Universal relates to a smaller orifice for less viscous li uidsSSF Seconds Saybolt Furol relates to a larger orifice for more viscous li uids
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
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L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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iscosity influence on nozzle flow rate
AlI nozzle Catalogue data refer to spraying water water cinematic viscosity is e ual to CentistokeA li uid with viscosity higher than water will re uire more energy to be pumped and sprayed and will flow with lower velocityat the same pressure and this will cause a reduction in the turbulence of the flowFor the above reason nozzles working on the turbulence principle like normal full cone nozzles and whirl hollow cone nozzleswill show an increase in capacity while spraying li uids with viscosity higher than waterThis increase is very consistent for small size nozzles where the small radius of the whirl chamber tends to cause high turbu-lence in the flow and tends to diminish and to disappear for nominal capacity valves capacity values at bar larger than liters per minute
The graph below shows for a li uid with a viscosity of about Centistokes typical variations in the nozzle flow rate value fordifferent values of the nozzle whirl chamber diameterAs it may be seen these variations can be neglected in most practical applications where nozzles with whirl chamber diameterswell over mm are used
For other types of nozzles not working on the turbulence principle the increase on viscosity will simply reduce the li uid e itvelocity at the orifice thus causing a decrease in capacityE perience shows that this decrease ranges between and of nominal water capacity that is to say that the variationintroduced is in the same order of magnitude as the nozzle flow rate toler-ance
iscosity influence on nozzle spray angle and spray pattern
With reference to the theory of jet break-up and droplet information it can be easily imagined that spraying a li uid more viscousthan water is a difficult task
Al the properties of the spray tend to worsen therefore one can e pectA higher value for the minimum operating pressure that is the pressure value which allows for obtaining a well defined spray with the e pected spray angleA worse spray distribution since the viscous behavior of the li uid makes it more difficult to pro-duce fine droplets and to distribute them evenly with the desired spray patternA narrower spray angle It is difficult to give guidelines since results on different nozzles at different pressures and with different li uids are scarcely predictableHowever our e perience shows that in many cases the use of impact nozzles can give acceptable results where allother type of nozzle failsA laboratory test or a field test are stili the safest way to obtain sound results
0
0
0
0
0
0 7
Increase Flow rate s Whirl Chamber Diameter
Incr
ease
Flo
w R
ate
mm
Whirl Chamber Diameter mm
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid viscosityLI
QUID
SPR
AYAN
D SP
RAY
NOZZ
LES
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
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et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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With reference to the Bernoulli Rule as e posed in page one can say that the pressure energy of the li uid flow at the nozzleinlet is transformed totally minus some losses due to friction inside the nozzle into li uid velocity at the nozzle orificeCatalogue figures give nozzle capacities when spraying waterIf the specific gravity or density of the li uid is different from that of water the available pressure energy will produce a differentli uid velocity at the nozzle orificesIn other words a given uantity of energy will spray always the same uantity of li uid mass but different volumes flow ratesaccording to the li uid specific gravity or density
Therefore a li uid heavier than water will e it the nozzle with a lower velocity at lower flow rate while to the contrary a li uidlighter than water will be sprayed at higher velocity at higher flow rate
The following formula is to be applied
The table below gives the value of a correction factor to obtain the flow rate of a li uid with different specific weight as water
Where L Li uid flow rate W Water flow rateF Correction factor
kgliter Libregallon F
0
0
00
0
0
0
0
0
07
077
07
07
07
L F W
LIQUID SPRAY AND SPRAY NOZZLES Influence of liquid specific gravity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
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The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
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E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
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PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
The spraying water impact of a nozzle depends on several factors and more precisely spray distribution pattern and sprayangle The first step to calculate the impact value which is usually e pressed in Kilograms per s uare centimeter is to deter-mine Total Theoretical lmpact Value using the following formula
The obtained value has to be multiplied by the Total Theoretical Impact per S uare Centimeter Coefficient EThe final value is the Spraying Li uid Impact e pressed in kgpcm Of course not alI the energy of the fluid vein is transferred to the impact point
A part of this energy sometimes a considerable part goes to obtain a desired spraying angle by having the li uid vein ac uirea high rotational speed inside the whirl chamberThe highest value of impact is obtained with straight jet nozzle and the value can be calculated multiplying spraying pressureper The tables below containing the Total Theoretical Impact s cm coefficient values for different spray pattern nozzles for a dis-tance of mm
kgpcm
TOTAL THEORETICAL IMPACT PER S CM COEFFICIENT AT DISTANCE OF 00 MM E
Spray Flat et nozzle Spray Full cone nozzle Spray Hollow cone nozzleAngle Angle Angle
Where is the flow rate at working pressure in lpmP is the pressure value in kgpcm
kgpcm TTI P
SLI E TTI
0
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
SLIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
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PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
et impact diagram
A further parameter to characterize the performance of a spray nozzle isthe distribution of the jet impact force which could be derived by meansof mathematical methods from the values of the spray distribution ontothe surface covered by the spray but which can more easily be measuredwith the help of specifically designed instrumentation
In some applications the jet impact force Is the most important parameterused to realize the re uired processSteel sheet descaling in a rolling mill is a typical e ample where the jetimpact is re uired to take away the surface scale and obtain a perfectlyeven surfaceFor that reason special nozzles have been developed to perform this verytask where service life impact value and spray distribution reach thevalues re uired for satisfactory resultThese test are performed in a laboratory e uipped with a specificallydesigned instrumentation where the high pressures involved in theseprocess can be reached which can measure the pressure values along amatri of points distributed in the spray area covered by the nozzle
These values are supplied both in a table of values and as a D pressurediagram similar to those shown below
On such applications where producing high impact values in the jet isnecessary it is of paramount importance that the li uid flow turbulence iskept to a minimum and therefore it is widely used to insert into the nozzleentrance devices designed to improve the operating conditions by forcingthe li uid flow through straight passages with several different shapes by doing so the impact delivered by the spray is increased with the samefeed pressure
One typical shape used by Pnr is shown on the right and the two dia-grams below show the impact force diagrams for the same nozzle withand without a flow straightener the reduction of flow turbulence can leadin increase of impact force often higher than Further improvements of course are available when the nozzle insideprofile is properly designed in order to avoid sharp cross section changesand all surfaces are finished as smoothly as possible
Typical design of a Pnr flow straightener
Impact pressure diagram with flow straightenerImpact pressure diagram without flow straightener
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
LIQUID SPRAY AND SPRAY NOZZLES Jet impact
wwwpnr-nozzlescom CTG SH 07 EU
LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
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IALS
NOZZLE MATERIALS Properties of materials
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MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
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IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
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The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
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The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
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0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
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SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
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PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
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LIQUID SPRAY AND SPRAY NOZZLES Pressure drop through a nozzle
Pressure drop through a nozzle
Some of our customers have asked us In the past which Is the pressure drop through a nozzle since they consider a nozzleone of the parts in a piping like a valve or an elbow which causes a given pressure drop along the line
The reality is different and can be easily understood when considering the Bernoulli formula as given at page of thismanual the formula says that the total energy of a li uid flow is made from the addition of three facors
Potential energy due to elevation Pressure energy Velocity energy
When we apply the formula at the entrance and at the outlet the orifice of a nozzle and we neglect the influence of turbulencelosses in between we can easily see that
The potential energy variation can be neglected because of the limited dimensions of the nozzle since the distance between the nozzle entrance and the nozzle orifice plays no role-The pressure energy variation is important since the li uid pressure value falls abruptly from the pressure inside the feed pipe to the ambient pressureThe velocity energy variation is also consistent since the li uid is ejected from the orifice at high speed
In other words the pressure energy of the li uid flowing through the orifice is suddenly transformed in li uid drops velocitywhich is e actly what a nozzle is designed to do
This is shown from e uation at page which allows the e it velocity from the nozzle to be calculated from the pressureinside the pipe we actually consider the pressure difference between the inside of the pipe and the ambient pressure in thisformula
In other words all the energy still available at the nozzle is converted into velocity or if you so prefer you have a total pressurefall The system designer shall therefore evaluate all the pressure drop between the pump outlet flange and the nozzle entrancein order to be sure that the nozzle feed pressure is sufficient to assure the desired capacity for the li uid being sprayed
parameters valuesat nozzle outlet
nozzle inlet nozzle oulet or orifice
feed pressure
inlet velocity
parameters valuesat the nozzle inlet
(A)potential elevation
energy
(A)velocity ( kinetic ) energy
(A)pressure energy
ambient pressure
exit velocity
LIQU
ID S
PRAY
AND
SPRA
Y NO
ZZLE
S
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
The choice of the right material for a nozzle is sometimes the most important one to dosince the nozzle operating life depends upon itThere are several factors to influence or shorten the nozzle operating life sometimes morethan one at the same time the most important being
Wear from solid particles suspended into the li uid being sprayed Chemical corrosion from the li uid being sprayed Chemical corrosion from the ambience outside the nozzle E posure to high temperature E posure to mechanical shocks
NOZZLE MATERIALSPnr material codes 34Properties of materials 35Mechanical properties of materials 39Chemical resistance of materials 40
NOZZLE MATERIALS
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
ATER
IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
PNR has adopted a short code to identify construction materials for nozzles and nozzle partsHere below the most fre uenty used materials
MATERIAL STANDARDS
The following standards are mentioned with reference to materials identification
NOZZ
LE M
ATER
IALS
A Free Cutting Steel E TEFLONreg (PTFE) L NICROFERreg 5923
A Carbon Steel E DELRINreg (POM) L STELLITEreg 6
A Zinc Plated Mild Steel E PERSPEXreg (PMMA) L HASTELLOYreg B2
A Nickel Plated Mild Steel E7 VITONreg (FPM) L HASTELLOYreg C4
B AISI 304 Stainless Steel E NBR- Sh 70 Rubber L HASTELLOYreg C22
B AISI 316 Stainless Steel E SANTOPRENEreg Rubber L ULTIMETreg
B AISI 316L Stainless Steel E KLINGERITEreg L7 NICKEL 201
B AISI 321 Stainless Steel E HYPALONreg L HASTELLOYreg C276
B AISI 309 Stainless Steel E Silicon L SANICROreg 28 SS
B AISI 310 Stainless Steel F Tungsten Carbide (TC) N AISI 302 Stainless Steel
C AISI 420 St Steel hardened F PIREXreg P ABS
C AISI 317 Stainless Steel F Rubin P7 FASIT OIL
C SAF 2205 Stainless Steel F Zapphire P EPDM ShA Rubber
D Polyvinylchloride (PVC) F Ceramic P STIROLUXreg 637
D Polypropylene (PP) F Silicon Carbide (SC) T Brass
D Polyamide (PA) G Cast Iron T Copper
D Powder Charged PP H Titanium T Bronze
D Fiberglass Charged PP L MONEL 400 T Nickel Plated Brass
D7 High Density Polyethylene L INCOLOYreg 825 Aluminium
D Polyvinylidenefluoride (PVDF) L INCONELreg 600 7 Aluminium ENP
STANDARD ORGANIZATION COUNTR STANDARD CODE
AFNOR Association Fran aise de Normalisation France NF
AISI American Iron and Steel Institute USA AISI
ANSI American National Standards Institute USA ANSI
ASTM American Society for Testing and Materials USA ASTM
BSI British Standards Institution UK BS
DIN Deutsches Institut f r Normung Germany DIN
DSIT Dansk StandardsInformation Technology Denmark DS
ISO International Organization for Standardization International ISO
IS apanese Institute for Standard apan IS
UNI Ente Nazionale di Unificazione Italy UNI
NOTEThe complete list of the Materials Codes may be re uested to our Technical Service mentioning release code TGCE CODMAT
NOZZLE MATERIALS PN material codes
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NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
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C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
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IALS
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L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
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IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
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IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
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LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
NOZZ
LE M
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IALS
B AISI 0 STAINLESS STEEL
Chemical composition CR 7 0 NI 0 S 0 Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Possible with precautions Euro CrNiS
Corrosion properties
Good resistance Atmospheric e posure foodsubstances organic chemicalsLow resistance Chlorides reducing acids andover C
IS SUS
NF Z CN -
SIS
UNI WCrNiS
B AISI STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foodsLow resistance Solutions of reducing acidstemperatures over C
IS SUS
NF Z CND -
SIS
UNI CrNiMo
B AISI L STAINLESS STEEL
Chemical composition C 00 CR 70 NI 0 MO Coding correspondence
Type Stainless Steel Austenitic AISI L
Hardening Not possible BS S
Annealing C in water DIN Wnr
Welding Easy using same steel electrodes Euro CrNiMo
Corrosion properties
Good resistance Atmosphere great number ofsalts organic acids foods salt waterLow resistance Solutions of reducing acidstemperatures over C
IS SUS L
NF Z CND -
SIS
UNI CrNiMo
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
C AISI 0 STAINLESS STEEL
Chemical composition C 0 0 CR 00 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C in air DIN Wnr
Welding Possible with precautions Euro Cr
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z C
SIS
UNI Cr
C AISI STAINLESS STEEL
Chemical composition C 0 CR 0 S 0 Coding correspondence
Type Stainless Steel Martensitic AISI
Hardening - C in oil BS S
Annealing - C DIN Wnr ---
Welding Not possible Euro CrS
Corrosion properties Good resistance Drinkable water steamgasoline oil alcohol ammonia
IS SUS
NF Z CF
SIS ---
UNI CrS
D POL IN LIDENE FLUORIDE P DF
Description HIGHMOLECULAR WEIGHT THE TOUGHEST OF THE FLUOROCARBON RESINS
Trade names SuppliersKYNAR Atochem North America Inc formerly Penwalt Corporation
SOLEF Solvay Polymer Corporation
Physical andMechanical Properties
E cellent resistance to abrasion and stress fatigue
E tremely pure opa ue white resin
Thermal Properties UsefuI in temperatures ranging from - C - FHeat deflection temperature is C at Bars F at psi
Chemical Compatibility
E cellent chemical resistanceCan be used with wet or dry halogens most strong acids and bases aliphatics aromaticsalcohols and strong o idizing agentsNot recommended for contact with ketones esters amines and some organic acidsfuming sulfuric acid
NOZZLE MATERIALS Properties of materialsNO
ZZLE
MAT
ERIA
LS
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
E POL TETRAFLUOROETH LENE PTFE
Description FLUOROPLASTIC THAT HA E SOME OR ALL OF THEIR H DROGEN MOLECULESREPLACED B FLUORINE
Trade names Suppliers
TEFLON TFE FEP and PFA Dupont Polymer Products
NEOFLON Daikin
FLUON ICI Americas Inc
SST- SST- Shamrock Technologies Inc
Physical andMechanical Properties
Low coefficient
Low adhesiveness
Buona resistenza agli agenti atmosferici
Good weatherabilityLow resistance to creep and wear unless reinforced with glass fbers which results insuperior resistance
Thermal Properties High and low temperature stabilityHeat deflection temperatures range from C at bar - F at psi
Chemical CompatibilityChemically inert
Totally insoluble
E ACETAL ACETAL HOMOPOL MERS AND COPOL MERS
Description HIGHL CR STALLINE RESINS BASED ON FORMALDEH DE POL MERIZATIONTECHNOLOG
Trade names Suppliers
DELRIN Dupont Polymer Products Corporation
CELCON Hoechst Celanese Corporation
ULTRAFORM BASF Corporation
RTP RTP Corporation
LUPITAL TENAL Franklin Polymers Inc
FULTRON ICI Americas Inc
Physical andMechanical Properties
High tensile strength rigidity and esilience
High fatigue endurance
E cellent dimensional stability
Low coefficient of friction
Outstanding abrasion and wear resistance
E cellent creep resistance
Thermal Properties Heat deflection temperatures range from - C at bars - F at psi higher if glass flled
Chemical Compatibility
Remains stable in long-term high temperature water immersionE cellent resistance to chemicals and solvents but prolonged e posure to strong acids notrecommendedNote Suitable for close-tolerance high-performance partsAvailable for machined parts or may be injection molded
NOZZLE MATERIALS Properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good against pitting and tensile-corrosion specially in o ydizingatmosphereResistance in welded joints definitelybetter than C lower than C
Rp Mpa Ni
HRB Cr
Mo
W --
Fe ma
Ti
Co ma
APPLICATIONSRecommended for applications with strongly o idizing atmosphere
L HASTELLO C
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
E cellent performances with o ydizingatmospheres as well as for pitting andtensile-corrosion conditionsVery good resistance in reducingatmospheres and for welded joints
Rp Mpa Ni
HRB Cr
Mo
W
Fe
Ti --
Co ma
APPLICATIONSChemical industry gas ducts gas washing and treatment systems phosphoric acid production Heat e changers pumpschlorination reactors
L HASTELLO C 7
PH SICAL AND MECHANICALPROPERTIES CHEMICAL COMPOSITION CORROSION RESISTANCE
R Mpa C ma
Very good in reducing and o ydizingatmospheresVery good against pitting and tensile-corrosionAcceptable resistance in welded jointsIn cast parts e cessive segregationnot eliminated by thermal treatmentof annealing makes it convenientto use C or C ualitieswhichassure better corrosion resistance andmechanical properties
Rp Mpa Ni
HRB Cr
Mo
W
Fe
V ma
Co ma
APPLICATIONSChemical industry air ducts scrubbers fans Paper industry Thermoelectric plants Steel thermal treatments
NOZZ
LE M
ATER
IALS
NOZZLE MATERIALS Properties of materials
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
MATERIALTENSILE STRENGHT
CORROSION RESISTANCERp 0 R
C C C C
F F C C
AISI
Good sensitive to corrosionbetween grains for slow heatingand cooling in the - Crange temperature
AISI Discrete
AISI L Good especially for L sensitive to corrosionbetween grains like AISI
AISI Good Sensitive to corrosion betweengrains like AISI
AISI Good - LSensitive to corrosionbetween grains like AISI
AISI L Very high especially for L
AISI Good
AISI Good
AISI
Good in medium corrosive ambientatmosphere water gasoline alcoholN - foodsNot in high corrosive
BRASS - --- - --- Good especially when nickel plated
BRONZE - --- - --- Discrete especially with sea water
CAST IRON F V - V
NICKEL ALLOYS - V - VVery high also for high temperatureTo use in the temperaturerange - C
PLASTICS --- --- - ---
Good also for erosionGenerally they are attackedwith o idizers like nitric acidhalogens ect
PTFE --- --- - ---
Very high e cept for elementarystate of alkaline metalsand to compounds containingfluorine at high temp
DUPLE STEEL AISI AISI AISI AISI Very high also with high temperatureand also for pitting
TITANIUM alloy - V - VVery high in o idizing ambientVery low in reducing ambient and withcompounds containing fluorine
LegendRp 0 YIELD STRENGHT MPaR ULTIMATE TENSILE STRENGHT MPa To verify time by time
NOZZLE MATERIALS Mechanical properties of materials
NOZZ
LE M
ATER
IALS
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
PIPI
NG
PIPINGPipes data 74Economic pipe sizes 75Pressure drop in clean steel pipes 76Flange dimensions 78Sieve size conversion chart 80
PIPING
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
The following table report the data of pipes according to ANSI B that is one of the most used standards that regulatewelded stainless steel pipes
DN NPS ODmm
SCHEDULE
S 0S 0SSTD 0S S
t m t m t m t m
mm kgm mm kgm mm kgm mm kgm
NA NA
NA NA
NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
NA NA NA NA
Where
DN Nominal diameter NPD Nominal Pipe Size OD Outside Diameter t Wall Thickness m Specific WeightPIPI
NGPIPING Pipes data
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
The following Specific Pressure Drops are normally used in the good engineering practicewhere Y ΔPL ΔP Pressur Drop and L Pipe Lenght
For pipe sizing the Velocity V is also usedIn the following table are shown the typical li uid velocities in steel pipes
Some fixed pressure drop alues indicationsfor gate valves fully open consider a pressure drop of meters for normal bends consider a pressure drop of meters for a check valve consider a pressure drop of meters
In the succeeding tables we show the velocity and specific pressure drop for several flow rates and pipe diameters
Not boiling waterY bar m for pump discharge bar m ma if P bar
Y bar m for pump suction
Boiling water Y bar m for pump suction velocity ms
LI UID LINE T PE
Specific Pressure Dropsvs elocity ms
V V V
NOT BOILING WATER
Pump suctionPump discharge longDischarge leads shortBoiler feedDrainsSloped sewer
-
-
HYDROCARBON LI UIDSnormal viscosity
Pump suctionDischarge heather longDischarge leads shortDrains
-
MEDIUM VISCOSITY OILPump suctionDischarge shortDrains
--
OTHER WATERCooling tower Chilled waterSea water and generally foulingwater long pipes
Note In this case Cameron method has to be used with C
Y bar m for principal manifoldY bar m for secondary manifold
PIPI
NG
PIPING Economic pipe sizes
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
0
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
V Y V Y V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
SPECIf IC PRESSURE DROPS f OR WATER f LOW IN CLEAN STEEL PIPE SCH 0S
Legend Q ater Flow Rate (Lpm) Velocity (ms) Y Specific Pressure Drops (bar100m) ater at ambient temperature in straight pipe
0
V Y V P V Y V Y V Y V Y V Y V Ylm ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m ms bar m
PIPI
NG
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
0
0
0
0
0
00
0
7
00
0
00
0
00
0
00
PN (U I )
ND (DI )DN Flange Holes
D t W N a
PN (U I )
ND (DI )Dimensions Holes
D t W N a
ND 0 (DI )Dimensions Holes
D t W N a
PN 0 (U I )
LegendaDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
PIPING Flange dimensionsPI
PING
Blind flanges to DIN 7
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
LegendDN Nominal DiameterD Flange E ternal Diametert Flange ThicknessW Flange WeightN Hole Number Hole Diametera Hole a is
0
0
ANSI 0 lbDN Flange Holes
D t W N a
S
S
ANSI 00 lbDimensions Holes
D t W N a
ANSI 00 lbDimensions Holes
D t W N a
PIPING Flange dimensions
PIPI
NG
f langes to ANSI norms
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescom CTG SH 07 EU
PIPI
NG
Sieves are used both for determining the particle size distribution of a granular materialand to filter solid particles in a li uid Normally the sieve is made with a fabric whosecharacteristic dimensions areL is the Opening Width free passageD is the Diameter of the wireP is the Pitch of the wireS is the Thickness of the fabricTo classify particle sizes there is some Sieve Series according to specific standardsthe most known are Tyler Sieve Series US Sieve Series UK Sieve Series The Tyler mesh size indicates e actly the number of openings per linear inch of mesh
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
na
In the german standard DIN norm the Opening Width L is given in millimeters
PIPING Sieve size conversion chartPI
PING
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
wwwpnr-nozzlescomCTG SH 07 EU
L m
T LER Sie eMesh No
ASTM E Sie eMesh No
BS 0 Sie eMesh No
DIN Sie emm
in
in na
Applicable standards areISO ISO ASTM E - DIN BS AFNOR NF -
Legend Water Flow Rate V Velocity P Pressure dropPressure drop in bar per meters of straight pipe water at ambient temperature
PIPING Sieve size conversion chart
PIPI
NG
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU
Besides its main range of nozzles for industrial applications PNR manufactures a wide range of complementary products and systems tooptimize the use of spray jets and fluids control in most of the modern industrial processes
PNR PRODUCT RANGE
CTG AC
CTG LS
CTG UG
CTG AZ
Complementary Products andAssembly FittingsA complete line of nipples clamps swiveljoints and everything that helps you toassemble align and service your sprayingsystems quickly and easilyAir blowers mixing eductors filters clean-ing guns and lances hose reels steamheaters pressure tanks quick couplingsto help you build up a professional systemupgraded to the latest standards
Tank washing systemsA complete range from simple fixedwashing heads to the two-axis headsfrom mushroom nozzles to fluid drivenreaction heads up to the motor drivenwashing heads equipped with a pneu-matic or electric motorAll for the inside cleaning of industrialtanks according to the latest technologyaccessories included
Spray nozzles for industrialapplicationsOne of the world most complete lines ofnozzles for numberless industrial appli-cations Nozzles with a wide openingsrange various types of vanes severalspray patterns anti-clog design availablein small and big dimensions and made inmany food-grade materials like PFTE andStainless Steel 316L with threaded andflanged connections
Air assisted atomizersUltrasonic classic and automatic atomiz-ers for the finest atomization in any insus-trial process High quality machining andstrict quality control ensure your systemstop professional resultsProgramming and control panels for aneasy assembly of complete humidificationsystems
CTG SP
CTG PM
CTG SW
CTG LN
Spraydry nozzlesAir assisted or hydraulic high pressure ato-mizers made in high-quality metal alloys ortungsten carbideA complete line of nozzles for the moder-nization of existing facilities at competitiveprices To ensure highly accurate resultsand a long service life these nozzles aremanufactured with the finest materials andtechnologically advanced machines
Paper mill productsA line of products specifically designedfor perfect results on paper mill machinesincluding disc nozzles patented for self-cleaning filters flat jet nozzles with orificesin sapphire ruby and ceramic oscillatingtubes equipped with a computer drivenmotor
Steelwork nozzlesA complete line of nozzles for steelworkapplications including continuous castingair atomizers and conventional nozzlesdescaling nozzles for high pressure sys-tems dovetail tips for cylinders coolingand high capacity flanged nozzles for cokequenching
Gas cooling lancesSpillback or air assited lances for gas coo-ling in steelworks cement plants and otherindustrial applicationsWe can supply spare parts upgrade yourplant and even supply a complete PLCdriven system to enhance the towers per-formances to the highest efficiency levelallowed by today technology
wwwpnr-nozzlescomCTG SH 07 EU