Nebol Ungere Aer-ulei Engleza

8/4/2019 Nebol Ungere Aer-ulei Engleza

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mist lubricating

20134MILANO ltaly)viaMassimiano,2S

-I- tel.215725112/3/415DnoPsfi, tetex 1t1 7DRoPSAIIEHIIIEI1lffllB lll


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preface


3/30

INDEX

A - PBEFACE

History of mist lubricationFondamental rinciplesNebol system components

8 - APPTICATION

Basic steps to &signRolling element bearingsRecommended itting usageVentsOi l sumpsPlain bearingsBecommended itting usageGroovers and ventsThe rules or venting plain bearingsDefinitionan use of DMPSelection itting usage

Chart values of radicals or calculating CLMSelection of mist geneiator end control systemDyagram selection of Nebol gener'ating omponentsNebol system electrical diagramPipingNebol control unit device

Pago123

57778I

10101011121314151725

26


4/30

PREFACE

historyof mistlubrication

The problem hat nurtured this development was the.inability o -satisfactorily ubricate high-speed

spindle bearings on-grinders and similir equipment. The speed of thesg.bearings was. oo high for

;;;r; lubricaiion, aid liquio oit generated oo much heat through fluid friction,necessitating an ex-

pensive ecirculating ystem'

Air-lineoilers used o lubricate air powered ools were originally ried for this application. They prwed

unsatisfactory or two reasons. he air consumption wls great, and rhe.oil particlesproduced

bythese oilers were too large. and condensed mmediately n the piping. Tests. with the oilers showedthat only 3% of tne-on oriput, in the form of very small particles, eached he bearings and was "ry"t-tedout,,'by the air turbulence between the beiring races, This led to the development of the. irstNEBOLwhich used a small amount of air to prodlce a dense concentration of small oil particles.About gTVa of these-particles ould be transmitted o the bearings without condensing n the piping

regardless f the distance of the bearings rom the nebulizer.

The application of mist was xtended to Bvery type.of lubricat6rl surface in a broad spectrum of in-

dustdes.-ln all tn"r" upplications, te viscosiiv bi ttre oil being atomizdrarely_ex^ceqqd-216.cSti,Ooo SUS at l Ooo F.'li was establishedthat when the oil viscosrty exceeded 2,O0O 3,OOOSUS attti" pi"""irinl

"*Uientte-peiature, th clil/air atio obtsinable usingthe mist principle was too low for

ittrltiu" tudrication on mist applications. Oil reservoir heaters telpeU to stabiliz this output over

varying ambient emperature.Thermo-Aire air heaters were developed because t was discovered, hat by heating he air used tog"n"6i" rirt, oit" of any viscosity gould be atomized. Applications using oils from 1,OOO o 5,OOO5US at lOOo F are now common. Many applications, ubject to extremes n ambient temperature,,s" fnerrno-Aire to insure a constanl oil/air ratio regardless of the oil viscosity.

In this Engineering Manual all data is expressed ln Ct!! of air and CLM of mist at standard conditions.Ai.C1nn nO misttLM are practically he same. Mist CLM contains, n addition o air, atomized oilin li-qriO toir. itre votgme of t'he oil pariicles s negligible, ompared with the voluma of air which carriesiit"-oir p"nlciis. Since, at som point in designing an mist systm, the air consumption must beknown,'using cLM truly cr8tes a single rating system in which rx) conversions are necessary.

Today, the oil mist is still used o lubricate high-speed pindles n grinders. ncluded n the increasingrang" of mist applications re systems applied o alltypes of other machine ools, web and sheet pro-

""siingequipment, belt and chain conveyors, mobile- quipment chassis, errous and non.ferrous oll-

ing mi[s, ihafer screens, vibrators, crushers, centrifuges, kilns, pulverizers, ball mills, dryers, and li-quid processing pumps.


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PREFACE

FUNDAMENTALPRINCIPLES

NEBOL s a centralized ubrication ystem n which the energy of compressed as , usually air takenfrom the plant supply, is used to atomize oil which is then conveved by the air in a low pressuredistribution ystem o multiple points of lubricant application.The compressed air s passed hrough a venturi device. Oil, siphoned rom a reservoir by the air flow,is atomized nto a fine spray. Baffles downstream rom the venturi nozzle cause he larger oilparticles

to coalesce and return to the reservoir. The remaining air-oil mixture isNEBOL.NEBOLcontaine oil

particles averaging about 1-2 microns n diameter, which can be conveyed hrough distribution piping(mist manifold), at velocities up to 7,5 meters per second, o application ittings.

At the points of lubricant application, he air-borne oil particles are "wetted-out" by impinging on asurface at sufficient speed o cause adherence. NEBOLcan be introduced nto enclosed housings fthe lubricated surfaces are running within a certain speed ange. The speed of the gears, chains androllingelement bearings will cause sufficient wet-out" on these parts o provide good ubrication.For most lubrication points, the application itting must perform the "wetting-out" function. Suffi-cient pressure rop through an application itting creates enough mist velocity {over3O meters per se-cond to cause urbulent low. lf the length of the passage n the fitting is much longer han thepassage diameter {from 6 diameters ninimum ength or 2Oomrn H2O pressure drop to 2O diametersminimum ength for SOOmm H2O and higher pressure drop), there is a sufficient turbulent region o

causegood "wetting-out". The use of baffles n an application atting ncreases he "wetting-out" ac-

tion and almost all of oil particles are separated rom the air and combined nto drops of oil.

rne total output of NEBOL s a function of the generator. This output is controlled by the size of thenozzle and the applied air pressure. The application ittings meter or proportion he NEBOLgeneratoroutput, The manifold pressure or pressure n the mist distribution system is the pressure drop acrossall the application ittings that i s required or these fittings to fbw the entire output of the generator.

NEBOL ystems are designed o maintain manifold pressures ro m 125mm H2O o lOOOmm H2Odepending on the particular application. The Design Manifold Pressure s selected or each applicationon the basis of the types of application ittings used, he oil viscosity, and the speed of the surfacesbeing ubricated.

vENruRt

1\ - lAIR INLET

MANIFOLD

OILLIFTTUBEHEAVY OIL PARTICLES

OI L RESERVOIR

NEBOL ystem has advantages unique o this method of lubrication. Continuous application of oilcanbe matched closely to actual bearing equirements. This extremely ow rate of lubricant applicationpossible with NEBOLprovides continuous ubrication without the necessity of designing a recir-culating systm. This reduces he first cost of many designs, and mproves housekeeping y reducingoil consumation particularly where oil seal maintenance s a probfem.

The carrier air used o distribute he oil can provide additional benefits, particularly n designs wheregrease ubricationwas previously onsidered most applicable. he ai r maintains he housing or bear-ing enclosure under slight positive pressure, and the outward air-flow prevents he entrance of con-taminants.

Because here are no moving parts or cyclic mechanisms n the basic NEBOL components, andbecause he system pressure s very low, NEBOL s a reliable ubrication method. Proper ubricationsystem operation can be interlocked with machine operation or an alarm system, assuring properlubrication. o


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PREFACE

NEBOT YSTEMCOMPOI{ENTS

The barlc ilEBOLtYstcm Gomponcnb nchde:

1 - An air-line ilter-water eparator o assure clean air supply o the Generator.2 - An air pressure egulator o control he pressuro t the Gsnerator.3 - The Generator nJludes a venturi nozzle, oil lift tube, reservoir, and oil fbw adiustment scngw.4 - The distribution evice o convey he mast o th application ittings.S - Mist,Spray, r Condensing ppliiation ittings o meter and convert he NEBOL t each ubricatio

point.

Accorory ltlEBOLSyrtem Gomponcnr lncludc:

1 - A solenoid alve o start and stop the air supply o th Generator.2 - An oil heater o maintain he oil in the geneiator eservoir at the propor viscosity or good mist

genoration.

3 - An air heater o stabilizs oil/air atio, at varyingambient emperaturs,of to mist heavlr oils which

willnot atomize at the prevailing mbient emperature-4 - An oil level

"r'rit"ttto ribnaf Uraiolt evet n thi raservoir, r to control automatic sssruoir efill.

5 - A pressure witch to signal ow or high manifoldpreesure'6 - A pressure auge manometer) or visual ndication of manifoklpressure.7 - A mist detectioi unit to signal high or low density of oil Particls n the mist.

The hstaSed bcation of the baslc and acoessory NEBOT omponefits b ehown lchomatlcaly bebw.

Manonreter

Mist dctcqtkrr urit

Presrtlrc rwhctr

Vent littirg

Air zupply /Filter &\water

speratof

Oil suppV

Mist manifold

3

MIST FITTTNG

{E

SPRAY FITTTNG CONDENSING ITTING


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application


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APPLICATION

BASIC STEPS TO DESIGN A NEBOLSYSTEM: v

1 - ldentify he machine elements an d rate their NEBOLCLM requirements. v2 - Determine he oil Viscosity rating and select the deslgn manifold pressure. v

3-

Select he mist, spray, and condensing ittings, and indicate he source of venting for each ittingdischarge.4 - Select he NEBOL nit and control components.5 - Determine he electrical wiring arrangement.6 - Size and route he mist and air piping.7 - Indicate nitial settings and range of all system adjustments.These seven steps are comprehensively etailed n this manual. The work sheet omtat below can beused to record systematically he data for the first four steps.

TtrI

ct-t2 row sphericalroller bearing

2 row taperedroller bearing

1 row ctdindricalro$er bearing

Spur gears

l24mm shaft dia.(430 rpml

78mm shaft dia.166O pml

Somrn shaft dia.166O ym)

lOOmm ia . 178mm0enghtl phion

(113O pml1OO 3O5 driven gear

127mm dia.x 178mm

lenght (4OO pml19,O51mm tch2O3mm dia. driv

sproc*et 660 rpml

6,77

4,284

2,212

13,4

9,80

8,870

$pray

Sprey

Spray

Spray

8, 4

4,452

2 , 1 8 0

4,452

5.708

4,462

O.nborrdhbyrhth

fitthg

Semi-encloccd

Groorre

brg. eleeveSmi-

enclcgod

50,4

17,84

r3,r04

13,458

23.472

17 ,e

r +rayrcabo

Total ryrtam CLM 135,632

r{EBOr 6Y8TEil WOfU( 8|{EET

Minimum lmbint tsmpgrat$e: + 70 COi l viscosity rating: 1O8 cSt (5OO SUS ar lOOo FlDesign manifold pressure IDMPI: SOOmm H2O

Temp. range: +7to"460 COil type: EPMin. manifold prossurc: 3OO mm H2O

Recommended gsncrator; 120 Ct"ttt rated modubr lgsnerator range 45 to 196 CLMI untt with oil hstrRegufated air pressure: 3,7 bar 153 pnil lor 135 CLM

NOTES ON U$E OF WORK SHEET:1 - The type of application itting can be selected when the type, size, and speed of the element are

know.2 - The oriface size of the application itting can be selected when the calculated CLM input and

design manifold pressure are known.3 - The NEBOL generating and control components can be selected when the total CLM, minimum

ambient emperature, and the oil viscosity rating are known.4 - Where required, the slope of the mist piping can be selected when the minimum ambient

temperature nd the oil viscosity ating are known.5 - The size of mist piping can be selected when the total and sectional DMP CLM values are known,

5


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APPLICATION

THE FOLLOWING ECOMMENDATIONSNCLUDE:1 - Formulas or ratinq he mist input for machine elements n terms of CLM.2 - Methods of applyiig mist to eich type of machine element, ncluding ocation of the application

fitting, methoh'of vdnting, and ocaiibn of grooves or sump o provide a lubricant eservoirwithinthe machine lement.

3 - Prelubrication nd machine start-up equirements.

CALCULATIONFOR CLMFormulas or rating the_ mist CLM input for each machine element are based on the design standardoif/air atio of 232 mm3 per hour (abilutO,21O grammes) or ev_ery ir itre pe r minute. n practice, hisratio can be varied rom 60 mm 3 per hour per CLM o 84O mm3 NEBOL er hour per CLM.Tle degignstandard atio s 232 mm3 because a generator pelating without heaters and using a 5OO SUS atlOOo F oil will atomize rom 232 mm3 to 348 mh3of this oil into distributable mist every hour oreach CLM of air passed hrough he unit during normal plant ambient conditions.These ormulas dssume he elements o be fubricated are properly selected or the intended serviceand properly assembled and protected from contamination. Where abnormal conditions exist in amechanism, nd lubricant corisumption f this-or similarmechanisms s much greater or ess) hanthe formulas call for, the CLM to 84O mm3 NEBOL nstallation hould be designed o provide atechnically sound compromise between actualand calculated ates of lubricant consumption. The.for-mulas alsd assume us6 of an oil with the proper rnisting and lubricating qualities or the intended ap-plication.

FECOMMENDED ITTINGUSAGE:-pplication itting selection, using hese ormulas, s based on thg following.general ules:ai- Use spray fitiings for rolling motion elements such as anti-friction bearings, gears, and chains.b)-Use cbnd.ensing-fittingsor slidingmotion elements uch as plain bearings, lides, w.ayg.An exception o a.-and b.-is he use o-f mist fittings or rolling mot:on e-lements perating n the. properspeed dnge under particular ypes of loading. This and other specific exceptions ar e noted n thefollowingdata.Where tEe output of spray fittings flows through the lubricated elements because of vent location,spray ittings may be installed emotely rom the point of lubricant usage f the downstream passagesaie horizon-tal r'sloped downward. To spray diiectly on moving elements, space the spray fittingwithin 1 2 mm per 25 mm H2O manifoldpressure rom the moving surface. To penetrate ir barrierscreated by high speed elemefrts, pray ittings ar e nstalled 3 to 6 mm from the moving surface andminimum manifoldpressure s established aEed n the velocity of the element being sprayed. he n-stalled axis of a spiay fitting should be approximately perpendicular o the direction of motion of thesprayed urface. For direct spray of high speed elements over m/sec}, he manifoldpressure houldbe 5OO mm HrO - 2OOOmm HeO.Fo rmaximum 6fficiency, nstall 'ondensing nd spray ittings o discharge ownwards. Horizontalagplications re permissible. he oil discharg-e rom a condensing itting'flows by gravity directly o thgrooves supplying he sliding surface. The fitting ocation hould be as close o the grooves as possi-ble. When spray ittings are-installed o discharge pwards, he calculated CLM should be doubled.Mist fittings can be installed at any attitude n any location, providing he mist flow envelopes rpasses hrough he elements o be lubricated.

:NTS, GROOVES, AND SUMPS:Fropely sized and positioned vents and grooves n a mist lubricated element permit the necessaryescape of the carrier air while preventing he entrance of contaminants. Additionelly, hese psssagesare located o optimize oil retention and effectiveness within the element.Vents. associated ith rollingmotion elements, re sized o maintain very slight positive pressure n

an otherwise ealed enclosure, hus preventing he ingress f contaminants. Where he vent openingitself s exposed o severe contamination, hielded ents should be used. n a dry-sump applicationthe vent is located o provide drainage of all liquids rom the enclosure. n an oil-sump application hevent is located so that liquid oil will not splash or be drained rom the reservoir zones of the design.Proximity o oil sensitive materials should be considered when locating vents.Grooves. associated with sliding motion elements, are located o provide an even spread of oil, andterminate close o the ends of the sliding element o permit venting of the carr ier air. Grooves shouldbe located n an area which is not under oad all or most of the operating ime. ln flat slidingmotion ap-plications or vertical plain bearing applications, econdary grooving can be used o provide access oseveral primary grooves. n designs where the grooves are n a loaded area or where the carrier ai rflow is great, additional enting provisions re required.PRELUERICATION ND MACHINESTART.UPAll machine elements to be lubricated should be prelubricated with oil. Grease packed elementsshould be flushed with kerosene or solvent and then prelubricated with oil. This flushing must insurethat residual rease willneither clog mist nlets or vents nor prevent penetration f th e oi l to the loadbearing reas. When prelubricated lements ar e o be stored prior o use, a preservative il should beused n place of the mist oil. Sumps should be prefilled n applications sing oilsumps. Heavy service,slidingmotion applications hich do no t have oilsumps, such as arge plain bearings nd worm gears,should be run n with bath or circulating il ubrication efore converting o mist lubrication.

o


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APPLICATION

ROLTINGELEMENTBEARINGS:

CALCULATIONFOR CtM

The CLM input for rolling element anti-frictionlbearings sdetermined by multiplying he shaft diameter imes thenumber of rows of rollingelements, an d dividingby O,35for moderate ervice or by O,175 for heavy service. Th eheavy service actor is used for any of the following con-ditions:1 - Allconstantly hrust loaded bearings where the thrust

loading s significant n relation o the radial oading.2 - All preloaded bearings.3 - All bearings on shafts transmitting more than 4O

horsepower.

RECOMMENDED |TNNG USAGE:Spray fittings are recommended for all rolling elementbearings. For moderate service bearings having bearingspeeds above 1 m/sec, mist fittings are also recommend-ed. To compute CLM, use he mean diameter f the rollingelements, not th bearing shaft diameter.Spray fittings are installed so their output is close to therollingelemets. For radially mounted bearings designed ocarry hrust loads, such as angular ontact ball or taperedrollerbearings, pray ittings should be ocated so the flowthrough the bearing is opposite the direction of thrustfrom the bearing haft. This s not necessary f an oilsumpor oil bath is maintained.Remote nstallation s an advantage of mist fittings, and spossible because most of the discharge rom a mist fittingwill remain air-borne until carried nto the turbulent regionof the bearing. Also, one mist fitting having he requiredcombined CLM discharge an serve several bearings.

VENTS:For heavy service bearings, the fittings and vents arelocated so the calculated CLM for each row of rollingelements lows through that row of elements before ex-hausting rom the bearing. For moderate service bearingsthe fitting discharge can be used

to flowthrough

andlubricate wo conseeutive ows of elements before beingvented. Lubricating more than two consecutive rows ofelements s never ecommended.The minimum recornmended ent area s equal to twicethe total area of the orifices supplying low to that vent.Where fitting discharge s vented at more than one loca-taon he vent areas should be chosen to proportion heflow as required. Venting can be accomplished n smallbearings by notching lip seals or by drilling a hole in thebase of labyrinth seals. n farge bearings, abyrinths can beused as vents. In large bearings having contact sdals,vents are machined nto the bearing housing.

CLM NPUTCALCULATIONS

.UqgJgAILg.EEvrcE r:r_F4yI-LEFv!gcLM = DR/O,35 CLM = OR/O,IZSI

D = shaft diarneter n decimstorR = nurnber gl rows of ehrnonte

MODEFATE SERVICEC L M = O , 5 x 1 1 b . 3 8

ANGULARCOilTACTBALLEEARING

Oirection of thrust- - - r - .

HEAVYSERVICEC L M = t x 1 / 0 , 1 7 5 =

MISTFITTING PPTICATION

Notch seal

MODEflATESERVICE

C L M = O , 7 5 x q 4 , 3 6 = 4 , 3 O "

FLOW PATH THFOUGH WO ROWS OFELEMENTSORMODEBATE EFVICE P.PLICATION

7

= 1 , 4 3

5,70

o


11/30

APPLICATION

An exception o the forced tlow principleof inlet and ventlocation s used advantageously on single row, modarateservice, ball bearings, on shafts under 1OO mm indiameter, operating- over 1 m/sec. Bearings n this

category, mounted n the wall of a machine housing con-taininq mist atmosphere, can be mist lubricated f bothsides

-ofthe bearing dre freely exposed o the mist. A dlill-

ed hole or undercdt with a miniinum area of 3O mm2 inthe outer race support s used o expose he outboard sideof bearings n blind wall mountings o the mist in the hous-ing. The *indage created by the rotating parts of the bear-ing assembly will create sufficient flow of mist throughthb rolling elements. Th CLM requirement or all suchbearings s included n the calculated mist input for thehousing.

OIt SUMFS:A depth of oil sufficient to cover the inside diameter of thebearing cup is rcommended or all tapered roller bear-ings. For other bearing ypes the dpth of oil should be tor-amid-height of the -rollingelement at the bottom of the-oearing. For high speed bearings, vents used to controlthe sump level, should be located oward the direction ofshaft rotation from the bottom of the bearing so the chur-ning effect of the rollingelements does not throw sump oilout-of the vent port. Oil sumps, n applications where thebearings seals are preveriting he entrance of liquid con-taminants, should have drain ports in addition to ventports. Bearings with double lip seals require spray inletsand vents located o maintain an oil sump n the area bet-ween the contacting lips. The CLM seal requirement sequalto I row of elements on the same shaft in moderateservice CLM = DlO,35l. lf an oilsump s maintainedin a

moderate service application, or if the bearing oad s verylight as in some continuous process machinery, input(CLM : DRIO,TO).Means of sighting sump oil level arerecommended.

FOOTNOTEON VENTS:Vent. ar6as equal to twice the application itting orificearea will produce a back pres$ure n the housing equalto25% of manifold pressure. For contamination prevention, a

ousing pressure f at leasr 5O mm H2O s recommended.

APPL'CATION F MISTTO BEARINGWHERESUMP S MAINTAINEDAND DRAINPI.UG S ADDED

Ahsmatives for spray inlet --

Vontsussd tomaintaincil level

EXCEPTION O FORCED FLOW PRINCIPLE

OFTIMUMFLOWPATH FORTWO ROWS OFELEMENTSN HEAVYSEFVICE

Sprey hlets

ALTERNATE FLOW PATH FORTWO ROWS IN HEAVY SERVICE

OPTIMUM LOWPATH FOF TWOROWSOFELEMENTSNHEAVYSERV]CE

iIIODERATESERVICE

I o


12/30

APPLICATION

PTAINBEARINGS

CALCUI.ATIONORCLMThe CLM input for p!a!n sleeve o; iournal) bearings.is

Ht,Fffifl^.trtf$$!}ttJl{#,':;i#,svlF,with high oil loss.

Moderate service bearings are defined as follows;

1 - Rotating bearings on horizontal shafts where the load';il-i;-atwavs Tn he lower half of the bsaring'

2 - Bearings mounted in Pny position where the oil is re-taineAin the bCiring by c6ntact type seals'

3 - Bearings with potort bushings or synthetic "fric-tionless" sleeves.

Heavy service bearings ar e defined as follows:1 - Oscillating bearinls on horizontal shafts -where the

toad zone i" arwivi in'tne ower half of the bearing.

2 - Unsealed bearings subiected o shock loading.Yherethe load .one coirltlntly-shlfts, but boundary ubrica-ii;""'i;d"iliJ"[ii' iuCn'ai ins'pins nd prins ins ntrucks.

3 - Small rotating bearings not mounted on horizontalshafts.

Heavy seryice, high oil loss bearings are defined as:itfnT1g%*#:n',fl*f"l{ln;'i'illi''tgSrjoy#;Y:Jiiniinit-"io- iiinrirm*1?tt:;/rf3g3lli"i:where these bearings operate. v(referred o our technlcal servlce'

2 - Large bearings without seals that are not mounted onhorizontal shafts.

Fo r bearings reater han 1.25 mm diameter or 15O.mmlonq the inputs teJjmrnindgq au-ovq an be checked. s-iXlj"tiiJii.ura-Lltii": 60 o x txd/r whele' .=iiE*"Irti-'driitinl6i'-r = estimateo ours or totaliiii'd"i''t'*.n-tl oii-inine learince olume !-thebearing'r llj,IiilV-is-g]ven;;lG LCtween.one nd our' depen-iing on ne everityof the application'

GROOVING OR HORTZONTALLYOUNTEDROTATING PLAINBEARING

MODEBATE EFVICECt- t t 0 ,875x 1/O,22 3,98

CLM INPUTCALCUI-ATIONS

MODERATE ERVICECL M= OxUO,22

HEAVYSEBVICECL M= D x U O , l 3 3

HEAVYSEBVICE IGHOILLOSSCl-i/l= DxUO,O65

D - Shaft diamctcr h dcimctcr

L = Slcsw |errgth h ddmelor

VERTICAL OTATINGBEARING HOWIT'IG P-TIMUMGROOVIT.IG

or+0, L

HEAVYSERVICECLM = O75xO,75/O,1 3 = 4,23

GBOOVEAND CHAMFERLOWSPEED

FOR HIGH LOAD-

Condenting ftting

II

t-I

I lnlets and vents Section A-AI - A not shown


13/30

APPLICATION

RECOMMENDED ITTINGUSAGE:Condensing ittings are recommended or all plain bear-ings with complete sleeves. Spray and condensed sprayfittings are recommended for all half-sleeve bearings.Cond-ensing ittings are installed so the fitting outlet isabove he bearing grooving or other oil reservoir within thsbearing housing.

GROOVES AIID VENTS:The following general rules for groove locations n mistlubricated bearings are consistent with accepted groovingpractice or oil lubricated plain bearings, egardless f themethod of oil application:1 - Grooves should be located so that 9O% of the surface

area of the ungrooved surface (usually the shaft)passes over one oil groove during each cycle of mo-iion. Tnis rule is best represented by a longitudinalgrff)ve extending 9O% of the sleeve tength in aiotating bearing. Following his rule, oscillating bear-ings may require everallongitudinalgrooves. n smalloscillating bearings hese primary grooves can be con-nected by a circumferential secondary groove with asingle condensing fitting supplying all grooves. Onlarge bearings of this tYpe, a condensing itting shouldbe used for each longitudinal groove.

2 - Groove volumes should be kept to a minimum. With aconstant source of lubricant input, large volume

grooves, acting as reservoirs, are not required. Largevolume grooves can be a disadvantage on machinestart-up, f oil has completely drained rom the groovevolume during a shutdown period. For this reason'condansing ittings should not be spaced urther than12 5 mm apart n beadngs over 12 5 mm long'

3 - All groove edges or housing parting line edgres acingthe oncoming slidirXg urface should be rounded orchamferad o prevent scraping he oil from ths shaft.

4 - Grooves should be in the unloaded zone of hydro-dynamically ubricated bearings. On large bearings ofthis type the groove should be close to the area where

the shaftenters he load zone.

Thc rules for venting plsh beadng! 8tt al {ollows:1 - Grooves are also used to vent plain bearings. For this

purpose, ongitudinal grooves should extend to within6 mm from the end of the sleeve n horizontal bear-ings. Circumferential grooves in vertical sleevesshould be in the upper third of ths sleeve and alongitudinal groove extending upward from thisgroove to the end of the sleeve s preferred or ventingand should be opposite the condensing itting inlet.

2 - Bearings with very close tolerances or bearings withcontact seals require a vent passage connected to thetop of the internal grooving. The inlet and ventpassages may be combined.

Inlets {31

Vertictl bearing withaheft oscillathg 20o

HEAVYSRVICE IGHOILLOSSCL M= 1xl,25/O,O65 19,2

INLETAND VENT FOR BEARII{GOVER 125 mmLONGwlTH CONTACT YPESEALS

Intaty"nt

i lL-J-

INLETAND VENTFORBEARINGS NDER 125 mmLONGWITF|CONTACTWPE SEALS

Ventg {3)

l\llodoratosoruce

Vgnt

I

10 o


14/30

APPLICATION

The ollowing ecommendations nclude:

a - The definition nd use of DMP DesignManifoldPressurel.b - The relationships etween DMPard oilviscoshy, minimum mbient mpsrature, pplicatlonit-

ting efficiency, and operating manifold prssure.

DEFIilmONAltD USE OF DirP:DMP s the air pressure rop across he application ittings o supply he CLMreguired y the machineelement ormulas.

DMPANDOPERATING ANIFOLD RESSURE

ln a NEBOL ystem, he manifold pressure s the presstffa ifferentialbetween ho mist prsssure t theapplication itting inlets and etmospheric r66curo. he DMP and he operating manifoldprassura reapproximately he same when the air pressure o the generator s the same as ths calculated airpressure.

USEOF DMPWhen he machine element nputs have ben calculated, DMPmust be gelected o determine rificeareas f the application ittings.The standard DMP s 5OOmm watsr columnprossure or the follow-ing reasons:1 - Alltypes of application ittings operate fficiently.

2 - Direct spray applications an pnetrate air barriers round elements moving up to 1O m/sec aur-face speed.3 - The effect of oil traps s minimized when compared whh lower manifdd preesures.4 - Variation of manifoldpressure, ue o ambient emprsture nfluence on oil viecosiry, s negligibf

untilthe ambient approaches he minimum ecommended perating emprature f the applica-tion fittings.

Where hese actors are not relevant, ower manifold prossures re equally effective. hus:1 - For moderato erviceapplications singspray and mist fittings onV, 3OO mm H2O DMP s reco$t-

mended where close oil output control is used to maintain he strictest machine cleanliness.2 - For ight service pplications singmist ittings only, 13O mm H2ODMP s recommended o pro-

vide optimumoiloutput control.

Fordirectspray applications, 0OO mm HzO DMP s recommended here he surface peeds xceed1O m/sec. This DMP s also ecommonded hen application ittings are at or slightly below heminimum ecommended perating emperature.

When he DMPhas been selected, he orificesizeof the proper ype application itting s selected ylocating he fitting size meeting r exceeding he calculated LM nput at DMP.

/ t


15/30

APPTICATION

APPLICATION ffNNG SELECTION +IARTAl+tEANOil F|TNilG AIR OR ilTST FLffY - STAT{DAFD CfIT .

TYPE ORIFEE PRES8UFE HOP - mm IYATEF d.rt*,

2 0 ,8 11,2 0 ,50 0 .55 0 ,925 1 ,3 ' t r,08 2 ,21 2,85 3 ,O7 1,2Mist 4 1,1

6 1 , 411,2 0,949 1 1.87 2 ,68 3.41 4,5 5.46 6 ,2t r .61 1 , 2 1 , 5 3 1 , 3 5 2 , 8 4 5 ,1 1 6 ,72 8 ,32 9,35 2

Condenaing

0,6 1 Slot R=0,361 I Sb t R*O,6O2 2 Sb$ R=O,503 3 Slots R-O,6O4 5 Sbt s R=0,5O5 6 Slou R=O,6O

o,38 0, 50 , 8 6 1 , 1 71 , 7 3 2 , 3 22,64 3,54, ' , t7 5.764,98 6,88

0,67 0 ,81 0,75r , 5 4 1 , 8 2 1 , 13,05 3 ,66 1,44.69 6.46 27,58 8,91 2,38,73 10.3 2 ,4

9, 69 ,69.69,69,69,8

o ,192o ,391o,?821 , 1 7 31 ,9 5 52,346

CondenaedSPRAY

6 SlorcR=O.5O1 . 7

s.82 6

2,3462,268

3,69 5 . r 8 6 , 6 7,76 2 ,4

Sprayfitting

0, 60, 91 , 11 , 41 , 7

o ,281o,636o,9491 ,5 32,268

3 6353 53 535

1235 ,I

0 ,6 0 ,61 0 ,81 0 ,98 r,12 0,80o , 8 4 1 , O 8 1 , 4 5 1 . 8 4 1 , 1 8 1 , 21 , 1 2 1 , 6 8 2 , 1 8 2 , 6 6 3 , 1 3 1 , 52,62 3,3 4,5 5,54 A,44 25,O4 6,44 8.4 rO,38 11,76 2,4

-$raynozzlg

2,2e84,5368,8O/r

9,O72r 1,340r3.60816,978t 8 , 1 4 420,41222,A802if,98427,26229,6203 1 , 7 8 8

123

45678I

1 0t l1 2r31 4

1 , 71 , 71 , 7

1 , 71 , 71 , 71 , 71 , 71 , 71 , 71 , 71 , 71 , 71 , 7

3535353 5353536363 63 635353 53 5

3,52 5,8 7,847,84 10,04 15,56

11 74 15,4 21,2815,4 20,r 27,7219,04 26.e4 34,1022,68 29,4 40,0420.32 33,88 46,9229,96 38,08 61,5233,88 42,54 58,5637,8 46,79 61.324 1 , 1 6 5 1 , 5 2 6 5 , 844,8 55,72 70,5847,88 58,8 74,4960,96 81,88 77,84

9,8 11,218,76 22,122 7 , 6 4 3 1 , 9 235,54 4r,4443,40 50,450,96 68,867,68 67,264,12 75,0170,28 82,0476,44 88,768 1 , 7 6 9 5 , 286,4 [email protected] 106,4s4,38 110,42

2,43,244, 85,26E,46, 87,27,688. 48, 88,8

t{oTEs dt t 8E of APPUCAtXtil FfTTnfCSEtECnq{ CHART1 - Ban&:Desbn ManifoH PreesLre c 5OOmm wator columnpragurg.2 - ltr{ninwn.recornrnended yent erea equals twico thc aFplication itting orifice area.3 - Mqlnum recolnrnended nanifoH pressure or mist fittingsis 5O mm HzO.4 - Mininum rec-onrmen{ed manifoU p.eaauro or rpray fit-

rhg6 s 2OOmm H2O,

5 - [vlinimumeggmmendc{mcnifoHpreaswc or condensingfittinss 3 3O0 mm HzO.

6 - Oesign tianifold tsscure of 1OOOmm H2O is rcom-nreniled or:a. Dkect apray apdbatbns over lO m/sec aurfec8peod.b. Applicationc whers tho Embism remp. at ths thtingg

it'closa to th6 minimum recommen&d.ST'TUARY OF CALCUTANOilS FOR CI.T HT'T8 TO MACICNEEITTtrTTSbr.d on ot/*.r& of 4 mmZ d/horr/Gl..t *

A.L

b+rhgr

E h brrhef \loderat-e Service. rleawSorvheC. tleavi Servhe, HighLoEs

= DR/O,36- DR/O,175Spray ad mict finiuc rrc uscd.

D = *pft diamerr h dcclnetsrR = numbgr f rows of elemonts

Condensing, ondensed epray, and sprsy fittFqs ere used.L = beerinq enoth n dccimotorD = sfieft ilismo-tcr n docimotr

CLM=LD/O,22CLM LD/0.133CLM=LD/Q.O5

ffir* o-'C LM A/1 ,85CLM*A/O,92

CondcnCng, srd condonssd spray fitthgr arc usedA = maxinum contlc{ ae! ln dcimotsl

F|rr dr*r, po$r trrtlnltthg

Slbnt cfi.h

cLM=pDn\4iltootsloJzSpray, condensod sprEy, ond mist finhog are usad

P = pitch of chah ol sDrockct in dec-irnetor6 = iritch dia of snall iorocket h docimoterR = nunfier of rows of

'chehrollerc

W = width of chair in dccinrcterS = rpm of srnrlf sprockst

cuvr=wo!4mffiE:;

. sd"t:ff9.ffii#*T',3Y,T,:*ti3"""1fr*",Convoyot cholr CLM={3DW+O,1LW,/1 ,12 W = width oi Ctraln n O-ecimiter L = lengnh of chein in decimercrCamr CLM=FilO,g

Spray, and condcnsd $pray fittirrg8 ars uscdF = face width of cah in decimetcrD = maximum diarneter of canr h d$imter

Frclcd|thc rc*rc.brn ntrutr (.n+frHon fl rrutd CLM Df3o+DR/3ootxl ,7

Spray. and mirt fittings are usod

D = t*tch darnetei of nut, h decimsterR = ttumber of rows of elemsfits

HrH"+6"rf[P#ffirS[#o*-BiFihrui''frffi;SbMft?K$GB(x]vES;'AGErFoRDw.

12


16/30

APPLICATION

VATUESOF RADICATS ORCALGU]ANNGCLM l{ruTTO SItEilT CHAIN,AND ROLLER HAII\I,

FOWERTRAI'ISMITTF{Gn = rpm of rmal ryrccket

n

255075

r001251 5 01752002252502753003253s037340042545 04755005255505756m62 565 067570 072 5750775800825850875900

0,30,40,51 . 01 . 41 . 82.32.83.44.04. 65.25.96 .67 . 38.08.89.6

1 0 . 411 .212 .012.913 .81 4 71 5 . 616 .617 .51 8 . 519 .520.62 1 . 622.623.724.825.827.O

n

92 5950975

f000102510501475t 100112511 5 011 7 5120 01225r25 01275130013251350137 514001425145014751500't5251550r57516001625r6501675r7001725175017751800

28293032333435363839404?4344

464748505 15254555758606 ?63&6667697072737576

n

18251850187519001925195019752000?p,25205020752100212521 0

217522W222522542?75230023252350237824AO24252450247525002525255025752600262526502675270A

788081

838486888K)9193959698

r00

101103105r07109r 101t2114116118119

12112312512712e131133r35r36138lrto

/ n Y(,i*J

o

"Jm272527502775

?80028252850?4752900?g.2529502975300030253050

30753100312531s03r75320032253250327533003325

3i150337534003p.2534503/.7535003525355035753600

14 2144146

1/18150t 5 2154156r5816 0162lAt166168

17117317 5r77179181183185187190192

194196r982012032052872W212214216

tt


17/30

APPLICATIONTh e following ecommandations pply o:a - Selecting generator with best range of mist c - Determining eservoir efill intervals.

output- - -

d - Controlling nd adjusting il and ai r outputs.b - Determining eed or oil and air heaters. e - Oil selection.NEBOLGEIIERATORCLM OUTPUT:Generator air consumption is equal to the total CLM passing hrough the application ittings. TheGenerator elected or any application must provide he total application itting CLM, as calculated atDMP when operating with a proper regulated elirpressure. Minimum and maximum regulated air

pressures are listed for each model in the "NEBOL List". The air pressure necessary o have thegenerator CLM equal to the system CLM at DMP can be located on.the air flow vs. regulated airpressure curve of the mist generating nozzle.Where several nozzles can supply the CLM required at DMP, the nozzle hat will operate closest torated regulated air pressure s recommended because he range of adjustment rom DMP output isgreatest.USE OF OIL AND AIR HEATERS:At the temoerature at which atomization s occurring, oil viscosities between 324 and 54O cSt(15OOan O25OO SUS) are he heaviest or efficientatomization, nd he amount of oi lconverted ntodistributable mist per litre of air decreases apidly with decrease n tempe-rature. t some viscositybetween hese valles the oillair atio willequalthei esign tandard atio of 4 cubic millimetes er hourper CLM. The exact oil viscosity at which this occurs depends primarilyon the mixture of molecularstructures n the oil and ts additives.

I ines of constant operating conditions graphed on coordinates of oilviscosity in cSt, SUS at lOOo F--.rd minimum ambient emperature n centrigrade degrees, are shown on page 15. Th lines pertain-ing to NEBOL generators ndicate approximate limits for producing design standard oil/air ratio usingoils with minimum acceptable misting properties. The lines pertaining o application ittings indicatethe approximate imits for obtaining he CLM flow of these fittings shown on the CLM output chartsand graphs. The limits for mist fhtings and spray fittings with orifices smaller han 1,7 diameter areapproximately midway between the two application itting lines shown.The minimum ambient emperature and oilviscosity rating or any application s plotted as a point onthis chart. The location of the point indicates he extent to which oil and air heating s required. Thischart assumes:1 - Oi lheater hermostats are set between 32 an d 38" C.2 - Generators quipped with oil heaters but not air heaters are enclosed n a cabinet when operating

below 5o C.3 - The temperature of the air entering generators without Thermo-Aire s the same as ambienttemperature.

4 - Oil heaters are used in conjunction with air heaters where Thenno-Aire s required.

RESERVOIR EFILL NTERVALS:The maximum hours operation before refill for Generators operating at design standard oil/air ratiooutput is the usable eiervoir capacity n liters dividsd by the system CLM times 4OOO.For systemswithout Thermo-Aire he recommended efill schedule s 112 maximum operating hours.

/here specifications equire reservoir efillperiods exceed a certain number of hours {usually 2OO)the required eservoir capacity should be calculated as:

O , 2 S x h x C L MReservoir apacity Q = 1000

This reservoir capacity is the liters. Where nstallation of large reservoirs s inconvenient, or where alarge number of NEBOL ystems are operating, manualor automatic efillsystems are recommended.

SYSTEM CONTROLAND A&'USTMENT:All mist system controls are provided o:1 - Maintain manifold pressure y controlling he CLM output of th s Generator.2 - Maintain oil/air atio by controlling he oi l viscosity an d oil flow rate to the generating ozzle.

All adjustments made to change he performance of systems affect either manifold pressure oroil/air atio. Some model generators re equipped with devices permitting llpossible diustments,others are limited to a sihgle adjustment (change of regulated air pressurel. The type of adjust-ment an d range of adjustment ecommended or each yp e are isted below.

1 . CHANGEAIR TEMPERATURE ETTINGOF THERMO.AIRE EATERThis changes he oil/air ratio without changing manifold pressure. This change s most effective and

almost inear when the viscosi ty of the oil at the temperature of the heated air is between 108 and432 cSt (50O and 2000 SUS). Adjustment ncrements f 5Oo C are recommended, efer o NEBOLUst for adjustment rang of individual models. Thermo-Aire temperatures that produce oiltemperatures n the oil reservoir above 54 - 65o C are not recommended. Thermo-Aire emperaturesapproximately Oo C higher han the minimum recomrnended will usually suffice to obtain maximumoil/air atio.

Itl {il


18/30

APPLICATION

SELECTION F I{EBOLGEI{EBANNGCOMFOilENTSTO OBTAIT{OIUAIB RANO OF 4 CUBICMILUII'IETERF CtMThe minimum ambient emperature nd he oilviscosity or any ntended application s used o locatea point on this chart. The ocation of this point provides nformation used o determine he NEBOLequipment equirements or the intended application.

CSt SUS38 0C 100 0F

Temp3F

Temp.'C

13001060860650

453320

214

r60

10786

65

6000500040003oo0

20(X)1500

1000

750

500400

300

200

r50

roo9080

7A

60

55

mended operatingtempcratura fq 1,7 D

e r m o - A i r e

Gcncre or. t opcrat ingr.Frdcr. ftb lino do not rdqrro ngttrs

Oil haterg gro r6corn.mendcd for gencratorropruting bohrvgon hgao

-30 -20 -10 0 10 n s 40 50 60 70 go 90 100110120130140

-34,5 -29 -23 -179 -122 47 -1tr 4fr tO 15,6 rt3 49 54 60 66

f6! 1 5


19/30

APPLICATION

2. CHANGE REGULATED IR PRESSURE-niJcnanges th e generator CLM output which changes he manifold.pressure. liq adjustment willprovide a li-nearnc-rease r decrease h Ootn air anci oiloutput provicieci pplication itting efficiency sho t affected. Recommended ange s:

50-

2OOOmm HrO-

Systems with mist f ittings only.2O0 - 2OOOmm HrO - Systems with spray ittings ncluded'3OO 2OOOmm HiO - Sistems with condensing ittings ncluded.5OO 2OOOmm HiO - Direct spray on elements moving over m/sec surface speed also systems- with application ittings operating lose o minamum ecornmended emp.

1OOO 2OOOmm HeO - Direct'ipray on elements movlhg over 1O m/sec surface speed^ lsosystems with application ittings operating at or slightly below manlmumrecommended emp.

When application ittings operate close o minimum recommended emperaturg,. he oil tend.s o forma neavilioating in theboris or the passages of application ittings. The manifold pressure.increasesiaoidlv'under h--ese onditions so thbt theie is no bbrrelation between calculated and actual manifoldpiEsirlri. Since he total mist output is controlled by the generator and not the fittings, this.manifoldbressure ncrease s the only wai the system can bompensate or the restriction caused by the oilboatins. As long as the DMP s high enough, good sysiem balance and output is maintained nderthese Eonditioni, but the usefulneds of manifold presbure ndicators s greatly reduced. On Thermo-iire installations his effect can be reduced by usirig higher han normal air temperatures and nstalling

.e generator close to the fittings to raise helr operating emperature. Pipe agging and high-lowTfrerino-Rire operation can be used to further improve itting operating emperature.The above manifold pressure anges are possible o the extent the generator can provide mist withoutexceeding egulated'air ressurelimits. or a DMP or manifold pressure diustment bove 2OOOmmH2 O consult our technical ervice.

3 - CHANGE OIL AT}JUSTMET{T CREW SETNNGftris changsi the ffow rate of oilto the venturi device, which changeg he oil/air ratio without affec-tinq ma;if-old pressure. This adiustment s not linear. An incremeniof adjustment at large nitialset-iin6s chJnqes tte flow slishtly'while an increment of adjustrnent at low-initialsettings changes hefloil aoore6iably. he rans:o f adiustment s from 1/2 turn opn. o 2 to 4 turns open,-dpending ntype oi'generatbr. Maximum opening s recommended as initialsetting for all applications.

4 . OTHER T'IETHODS F CHANGI]IG OUTPUT NCLUDE:a - Change oil heater emperature setting.b - Change oil to different viscosity or typ.c - Add air by-pasd - use intermittent or high-low system operation.e - Change ype or size of individual application ittings.

OIt SELECTION:^il Type: Applications not requiring EP oils -Use urbine quality mineral oils or industrial pplication.Use motor oils for automotive applications.

Applications requiring EP oils -Industdal mist oils prefened.Automotive and industrial qear ubes are also suitable.

Oi l Viscoshy: Majority of industrialppticatlons se 10 8 - l

SQc$t

{!qq-

ZO 0SUS at lOOo F),

' Wl"iere old ambients rb encountered 3 - 108 cSt (2OO 5OO SUS at 1000 Fl ar eusually used.

Extremeiy cold ambients or very high speed rolling-element pplications use 7,4 - 65cSt (5O 3OO SUS at lOOo F).

Heavy Service applications se 150 - 21 6 cS t (7OO l OOOSUS at 1OO" Fl.Large'elements n heavy service use 324 - 5OB cs t (15OO_- 35 0 SUS at lOOo F).

Large, fow, semi-enclosed ear sets rse 65 0 - 13OO cS t (30O0 - 6000 SUS at l OO o F) .

Many additives commonly used n lubricating oils do not affect system operation. Exceptions nclude:a - Oils with solids n suspension, uch as graphite an d MoS2, should not be used without our aF

proval. Additionalmaintenance rocedures may be required.b - Oils compounded with most rust and oxidation nhibitors, detergents, and dispersants can be us-

ed. Oils containing viscosity index improvers can be misted, but these additives might con-siderably affect the mist output.

c - Oils compounded with paratac or soap fillers are not recommended.

16 o


20/30

I 2 3 4 5 6 7 8 j e to l l t2 /3 t 4 ts t6 t 7 t8 t9E

APPLICATION

BASICTTIEBOLYSTEMELECTRICALT{TERCOI{1{ECTIOI{IAGRATTI

-{Fc e Frs-e

1sff---1

/I

t6:rffi#s o L a

3 ^ 4

f- -

T S- l

* Lpsa

t--i." on * ots rtg"f^ l t

5 I -*-F-lt

l "I

A

1 HPS' . 6 ^I

o:- /3

,2G-- 7

l&Tom*ral 8 b not cot|nccr.d to t .mfud .ttlp.

|r-"tirrf16H wtc r'tsrdr to t mlh.l box, but b rct codt ciad lo arnhd rrb-

TABLEOF COMFONENTS

CodoSOLAAHOH

TS-1TS-2TS-3

OCAPLFSHPlSt"LsoLs

CqnponentAir valve solnoidAir heater elementOil heater lement

Air heater thennostatAir heatsr thermostatLow air tamperature switchCapacitorMist manifold ow Pressure whchMist manifold high pressure switchReservoir ow level switchReservoir oil level switch

High Level Switch 5 - 15 HLo w Level Switch 5 - 15 .switch can be modified (by user) o open when oil level s low.

oNot on all models,

NOTES:1 - This s the interconnection iagram or all generators, ut most models do not incorporate llttp

slectrical omponsnts.2 - Terminat oxes having he same erminal strip numbering re recomm$rded or ModularDeefi

Generators.3 - These erminal numbers are used n the recommended lementary diagrams or all units, ov6

though most models do not incorporate llthe electricalcomponnt8.4 - The recommonded lementary iagrams n this ssction are ntended o be represerrtativ f th

maiority f desired ookuPs.Where easible, ikeliahernatives re shown.

S - Availabilityof models or components with different vokage and/or requency atir3 must bdetermined y consulting he NEBOL ist.powsr consumption f riodels and components s also isted n NEBOL ist'

G 1


21/30

APPLICATION

RECOMIIIEIUDEDLEMENTARYWIRINGDlAcRAItts FOR NEBOL sysTEMS WfTHOUT otlHEATERSThese wiringdiagrams re ecommended or systems_integral ith a single machine. CR elay 5}canbe used o interlockmachine tart and stop wiih NEBoL fstem operation. S-l (1) can be omitted fmachine s equipped ith a power disconnect.

(t)

(2 )

p)

(4 )

(s)

(6)

p 8 - d

SEOUET{CEF OPERANON uPPERDIAGRAM}:1 - Manually losing ^P:1- {1.}energizes he air solenoid SoL A {41,allowingair to flow to thegnerator. losingDS-l also enelgizes he red ight 6}and CR sf; tr,ii"rore, CR contact 2} soFD, nd machine annot be started.2 - When sufficientmanifold rassure s attained, PS 51opens, e-energizing Band

he red ight.The machina an now be started by closingpB_l.'

FUilCNOil OF CR COHTACTS:1 - WithcR contacts n ocation1, machine annot be started withoutmist, and willshutdown whenthere s low oil level, ow manifold rssure, r high manifold r"""ui".

-

2'With cR contact^s n locstion 2, machine annot be started without mist, but once machine sstarted, ailure of the mist willenergize ed ight, but willnot shut down tho machine.

siouetce oF opERATtoN LowER DIAGRAMI:1 - Manually fosingDs-1 (1) start he.mist system simultaneousry ith the machine, nd ailure fthe mist willonly energize he red ight (Si.

(r)

(4

H

(4

os-t Main ewitch

Motor star l re lay

Motor start ralay

18

6)

o


22/30

APPLICATION

RECOMMET{DEDELEMENTARY WIRIilG DIAGRAN,ISFOR SYSTEMS WITH OIt HEATERS AT{DSIGNALSThese wiringdiagrams re recommended or systems ntegral with a single machine. CR elay 3) canbe used o interlock machine start and stop with systems operation. An alternate elay CR-2 (71canbe wired in series with DS-3, and CR omitted. Where DS-1 (1) is operated ust prior o machine start,th e oil heater should be wired upstream f DS-1. DS-1 can be

omittedf

machine s equipped with apower disconnect.

(t I

(2)

G)

(1)

(s)

@

(7)

(8)

(t )

e)B)(11{516)

0)(e)

Main rwhch

@I

ws

19

-*Stpply

Fc.s- / Mainswitch 6

SEAUEilCE OF OPERANOil {UPPEF DIAGRAMI:1 - Manually closing DS-1 (1) energizes he oilheater OH {2}and the red ight {b}indicatiqg powsr on,2 - Manually cfosing DS-2 {8} energizes he air solenois SOL A, alfowing air to flow to generator.3 ' When sufficient manifold pressura s attained, LPS 4! de-energizes he red light, a6d energizes he

gren ight (4! and optional relay coil CR (31.4 ' lf CR s used, machine can now be started. Afso, DS-3 {6}may now be closed o lock in howter Hfor annuciation of system fault and optionaf elay coil CR-2 (il.

SEOUEIICE OF OPERATION LOWER D|AGRAMI:1 - In the diagram Slow, WS Light Signal unit 1640650 - 1640660 is used n place of the indivldualred and green ights shown above. n case of a malfunction, ho red ight and'rc*f"t n, it usiC, witlremain-e-nergized ntif reset. Sequence of operation is the same, [xcepi there is no indicationwhen DS-3 can be closed without energizing he red light and howler.

-Also, there s no indication of power on when-DS-1 s cbled to energize he oil heater; nstead, hegreen ight indicates he air solenoid s energized.

supph

soL /,3 ^ a

o

!1"-:--


23/30

APPLICATION

RECOMMENDEDELEMENTARYWIBINGDIAGRAMS FOR SYSTEMS WIT}| AIR AND OIL HEATEBSAIUDSIGI{ALSThes.e. iring diagrams are recommended where system is lubricating a machine segment of amultiple-machine peration.Malfunction of the system energizes he warning signals, but does not stop the machine. WS alarmsignal units are interchngeable n either circuit irra'irgement.Upper circuit shows air heater on same power inpuias control circuits, and includes ow oil levelswitch.Lower circuit shows.air heater on soparate power input, and ncludes ow-high oil level switches, withonly the low oil level swhch connectedUpper circuit can include 2CR relay {4}for interlocking machine start with proper mist system opra_tion. when 2cF is used, 2cR contacts in start circuii are normally open.

Supply

7 S - e( t)

(2]

( r /

(41

(slt6t(7)

(8L(e)

SEOUENCE F OPERATIONUPPER TAGMMI:1 - Power across he nput ines energizes he oil heater OH (1).2 - Manually losingDS-l (21starts he lubrication ystem.S - Wltql _sysJems stabilized, S-2 6,8} s closed o lock n WS atarm, LightSignal 164O65O nd

1640660, H sound signal1638430 and 1640670 and optionat cR-relay.-

SEQUE]TCE F OPERATIONLOWER IAGRAMI:WS Light Signal nit,or equivalent. s shown n place of the alarm ircuitshown above, and DS-2 snot required.2CR elay cannot be used n circuitbelow, unless he WS afarm ystem shown n upper diagram s used.1 - Manually losingDS-1 1,5}starts he NEBOL ystem.2 - When he NEBOL ystem s stabilizsd, llwaming ights are de-energized.

Supply

4g-7 Main switch( t )

k)

(3)

(41

(5)

(6)

(z l

(8t(e)

(to)

ff-:;t ,o" nz-Ji4

20

7 s - 2

6.s-7 Malrowitch d

o.


24/30


25/30

APPLICATION

THE FOLLOWIHGRECOMMENDATION PPLY TO:1 - Air Piping, ncluding all piping, tubing, hose, devices, and connect ions used to supply air to the

genefator.2 - An piping, ubing, hose devices, and connections used o distribute he air-borne oil particles rom

the gene.rator.to he mist, spfay, and condensing ittings, or passages imulating ittings. This pip-ing is referred o as mist piping or manifold.

All air and mist piping should be free of dirt, scale, or other contaminating material. ntarnal diametersshould be of sufficient size o avoid excessive pressure drop. Materials s-hould e compatible with in-ternal fluids, and resistant o extemal abuse, hemical attick, and ambient temperatllre.

AIR PIPING:Galvanized r cgppej pipe,.copper r anodized aluminum ubing,. and rubber hoqe_or ynthet_icubingare recommended. Table A gives pressure drop, at various air flows, through 30 meiers of pipe.Since compressed air usu_ally ontains condensate, e water saparator should be used n the air pipingsupplying he generator. Since most supply piping contains scile or rust, a 25 or 40 microns aii fitte-rshould be installed upstream of the watei separat-or. he air filter may be either an integral part of thewatr separator, or a separate unit.The plant main supply.ptpe mist be larger han the^branch upplying he genrator. The plant supplypipe pressure, t the inlet to the branch, must be at leagt equai o ihe sum of tne regulated air presbureand the pressure drop througt the branch and the air acc6ssories, uch as air solenoid valvb, waterse.parator, nd air regulator.. f the strainers n the water separator and the air regulator become clogrg-

*;d, tlre pressure drop will increase.

TABLEA-AIRPIPINGPRE$8URE SOP PER3o.rnrtcrr Of PIPE. brrIB FLOW

CLMrt 7 brt

rt 25 o CPIPESIZE nrHmotfrr

7 , . D . 9 t.D. 12 .0 . 16 t .D. 2l t .D.56

t 1 21 9 642056098 0

12002800

0 , 1 4o ,3 6t , : ,

o,ozo ,2 to ,9 1t , : t

oizo , 2 1o,35o,98t f t

:o,o70 , 1 4o,28o,492 ,3 1

o,o7o , l 4o,58

MIST PIPING:Any manifold material meeting he generalrequirements bove can be used. Hack pipe and olain steeltubing can be used if protect-ed rom extemdl corrosion by paint. The bore of btiik pioe'should becoated with preservativo oil to prevent corrosion prior to the introduction of oil miit. Mist oioinoshould.permit mis.t low with minimum condensation of oil, and provide for drainage of the condbnset'il withow creating obstructions to the mist flow. Since thd mist systom ofrrates at verv low

-Trelltlur, he use gf pipe dopa or other thread-eealing compounds is n6t neces'sary and not ricom-mended..lmproperly used, these compounds can cbntaminate th mist pipinq.'Flushino of ttremanafold s recommended uring nstallation o eliminate cale and dirt which brin p-lug he sm-all oresof the application ittings.

srzlt{G F llsT PrPritG:The maximum recommended velocity of mist in the distribution manifold is 5 m/sec (meters Der se-cond). .Higher velocities will create rixcessive condensation, and may cause a rapU fluctualion-otmanifold pressure due to the "water hammer" effect of the liquid oil'in the manifbld.The distsnce hat mist can be canied in the manifold n any direction rom the gonerator s primarilydetermined. y.the allowabfe Fresgure_ rop. n the manifold-. Excessive pressure-orop Jni5use rm-proPr ubrication, by increasilg !h6 flow through application ittings nbar the geneiator, at the x-pense ot f low through remoto ittings. lt is assumed n Table B that a 2O% drop n manifold pressure,btween tfi6 genorator and the most remote application fitting in the sysiem, is the rhaximumallovable. Pressure differentlals hie great are rare n actual nstalfations, bobaus'it s impraitical tosize all the manifold so that the misfvelochy is always at the maximum.The service radius is Table B refers to the distance between the generator and the most rsmote ap-plication itting. This distance s obtained by adding he footase-ot ati manitotO izej ilirvi"l miitfrom the generator o the fitting. Application6 equirlig a longer-service adius

areeasible,

Uirt troutcibe referrecl o the factory for piping recommendation-s.

22 G


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APPLICATION

TABTEB. MIST PIPINGPIPC .D.

lmmlFIOW AREA

hq rilillilAX M|ST FLOW CLill IIAX IEIIGTHOF llsT Llltl mcterrl

3

4 , 6

78I

1 112,51 5 , 52 12 73 54 16 3

6378

7,06

1 5 , 9

3 8 , 550.253.69 5

122,7194,7346572962

132 022023 t 1 74778

One application itting - 5,6Two or more lttlngs - 3.08One application itting - 14

Two or more ittings - 71 620,52940,55 3 , 58 5

1 5 024442067 594 0

134 22080

. A P ICLMIL = --mi-

A P (CLMI

---frs-67 , 5

1 11 51 82 330.538496 17 37 373

TABLE B NOTES:1 - Table B applies o system designed o operate at manifold pressures above 4OO mm H2O. For

systems designed o operata betwean 4OO mm ard 150 mm H2O, divide either he service adiusor the air flow by 2. For straight mist systems de$igned o operate below 150 mm H2O, divideboth the servica adius and the air flow by 2.

2 - Table B assumes he minimum use of elbows, ees, and other connectors, and assumes maximumuse of straight uns of pipe or tubing. Changes n the direction of mist flow in the manifold produceadditional condensation and a p.essure drop eguivalent to many meters of straight run. In par-ticular, globe valves, angle valves, and solenoid valvss are not recommendEd unless he valve

orifice s twice the manifold low area shown in Table B.

3 - The manifold from the generator to any application fitting should preferably consist of no morethan three different pipe diameters should not be reduced mor than twice}'

4 - In Thermo-Aire systems, which use heated air to stabilize oil output under varying extsrnal am-bient conditions, Table B applies f temperature differentials among the apPlication ittings are notexcessive. Great temperature differentials can result in improper lubrication, by increasing heflow through hot fittings st the expense of flow through cold fittings.Table B thus applies o Thermo-Aire ystems operating under onc or more of the following condi-tions:al Heated ai r temperature ever exceeds ambient by more han 38o C.

b) All application ittings are about the same distance rom the generator.c) All application ittings located farther from the generator han distance L in the following

empirical ormula:6 = pipe ntemal diameter mm }

L = Txd/45O where T = trnFrature oClL = lenght {metersl

d) lf the Thermo-Aire system cannot be designed o setisfy al or bl or cl, allthe manifold shouldbe heated o maintain he same temprature at all appfication ittings.

MAfTIIFOLDNTERNALDIAMETER:The following formula is used to calculate he minimum manifold D when the mist flow is known:

d = 1 7\ffi where d = manifold nside diameter, millimeters

A 23


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APPLICATION

SLOPE OF MIST PIPING:The proper slope of horizontal manifold s as important as proper manifold diameter.The main manifold should be sloped oward the generator wherever possible. t is especially mportantto slope he first 3OO diameters of the main manifold oward the generator, since most of the oilcon-densation occurs within that distance. Branch manifold, f sloped oward the main manifold, should beconnected o the top or sides of the manifold, o avoid liquid oil traps.Table C indicates he recommended lope of manifold or proper drainage of condensed ilback o theNEBOLgenerator or other oil collector.

TABLE C . SLOPE OF MIST MANIFOLD TOWARD GENERATORo|Lvlscoslw MhIIilT'M AMBIEIIT OR MA'IIFOID TET#ERA'TURE

cst tSUS.r ooo Fl -17,80 C oo c loo c 25o C 38o c

20,5 100 5 ,3 3 ,7 3 ,0 2,4 2,13 8 , 5 1 8 0 8 , 8 s , 4 4 , 1 3 , O 2 , 56 4 , 5 3 0 0 1 0 , 5 6 , 1 4 , 6 3 , 7 2 , 9

108 500 '12,2 7,2 5 ,5 4,4 3,51 7 3 8 0 0 1 8 , O 8 , 5 6 , 5 5 , 1 4 , 03 2 4 1 5 0 0 1 , o 8 , 8 6 , 1 4 . 9540 2500 15,O 10,4 7 ,1 5,4

1080 5000 14,4 9,O 6, 7

Percont slope of meni{old

2% slope equals 50 mm H2O drop every 2,5 ml . of manifold

TABLEC NOTES:I - TaHe C is for rnanifold where condensad oilflow is opposite the mbt flow.2 - Wherc drainage provisions a[ow tho condensed oil and mlst to flow in the same drectbn, horizon-

tal runs do not reqtdre any slope. Hodrontal runs wHch an not sbped shor.ffi have &alnage Xrintemt farther apafi than 3OO knes tho manlfold l.D. The dralnage may be to pointc of fubrlcation, orto a sta@ipo or sump having provicirn for perlorfic dumping of condsnsod oil.

3 - Tabh G is for Installati6ns h continuous ofratbn.For $ystems oporating ono or two shifta daily, dvide dwc in TaHo C by 2.

OILTRAPS:quid oil traps should be avoided wherever possible. Small oiltraps do not stop the flow of mist, but-6ause

loss of manifold pressure equal to the pressure head of oil in the trap. The loss of manifoldpressure ecreases he flow of mist to machine elements served by the trapped ine. When he heightof oil in the trap is about equal o manifold pressure n millimeters water, the flow of mist will stop.

Oi l raps will not form in branch ines under 4,5 mm 1.D., f themanifold pressure

xceeds2OO mm

Hzo.To avoid traps, the manifold should have drainage provisions at all low points.Where oil traps are unavoidable, nd oil dripping s permissible, 12 mm diameter hole at the lowestpoint of the trap will drain the condensed oil. Where oil traps are unavoidable nd oil dripping s notpermissible, ondensate ines must be installed below the manifold, with connect ions o the bottomof the manifold.Where oil condensate ines are installed, he condensate an k should be vented with a 1,2 mmdiameter hole. The venting prevents back pressure n condensate ines, and allows the {low of mistthrough h condensate ines, hus aiding he flow of the condensed oil to the tank. The venting per-mits he use of small 3,75 mm l,D. condensate ines or mist systems, and 6,25 mm l.D. condensatelines or Thermo-Aire ystems. Without he venting, he condensate ines should be at least 9,5 mmLD.

24 o


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APPLICATION

TYPICATMIST SYSTEilIPIPII{GSCI{EtrIATIC

R(I,'TE OVEROSSTHJSNOilE TOAV()|D TFAFE

NAtrOTDPnEs8r.E8WrCHhlwryr mountndtdr o h.Yr r+wrrd routrd mlrtmdto|d com.cdonl

}IAITFOTD BLOCTS

SLOPEDmAn HAilFOLD lno omrcdonr to bottqn ofm$o|d prilrtltbd h tt* rrctbtl

AIR IIS.ET

Itrt5ll TAP?trlO Ef,AIrCH J{E @f$XECTORS DIRECTTY IilTOtrATIFOtD PIPE COTT{ECTORfiREAD 8HOIJ].D rcT MTN.IXIITO PfE

MST EX}TilJ3T TJil8lur whrr urit tr Eo.N. !o oFlcnrllvr nnrr*l

ST OI'TLET

ArRUilEOON{TnOL8

LIOUID OIL :RETURTI ITES Iltr rdrr m ol Idrhplnf l. Pff' Idrdrl Ir---l. )

l K .t \

o(ilTROt IPArEr I

itIIIIt ,r

RETIRtrt Oil. COL-LECTfi |do narauar ln rnlrtlrmrrOd

_.L____q,TLETAUIOTATIC

WATER SPARATOR

fG\ 25


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APPLICATION

NEBOLCONTROLUNITDEVICEThe complete NEBOLCONTROLUNITdevice permit an mmediate ontroland checking f oilmist into the manifold pressurized at real time,

It is c omposed n two principal arts:- one detector device- one digitalunit.

- -'lOL detectorThe mist detector is an electronic device that produce ananalogic lectricoutput n function of the optical signalfromdensity of mist in the manifold'The density of mist is continuously n according o electricoutput from the device.

Digital unitThe digitalunit is an electronic nalog-digital onveilor ha t

permit o visualize he quantity of NEBOL n the manifold.The visualizati on f NEBOL s dir ect and in real ime withnumbers on the digit proportionate o quanti{ of oil inpercentage t the mist.The electric connection between detector o control unit isfeasible with a little screened cable.Appropriate potentiometers allow to define the scale ofvalues ndicated on the digit.

26 o


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APPLICATION

In the picture below there s a particulary NEBOL nit device or explosion*proof ssembledcomplete with a NEBOL ontrol device.

Date post:	07-Apr-2018
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Nebol Ungere Aer-ulei Engleza

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