Published by the WaterJet Technology Association for the benefit of its members APRIL 2006 906 Olive Street, Suite 1200 l St. Louis, MO 63101-1434, USA l Telephone: (314)241-1445, Fax: (314)241-1449 ABSTRACT Steel process lines and tubes are commonly cleaned using waterjet systems with pressures up to 40,000 psi. There is a risk of damaging these lines depending on operating parameters such as jet pressure, angle, rotation and rate of traverse. These lines vary from small diameter heat exchanger tubes to larger pipes. The highest energy concentrations with greatest risk typically occur in the small diameter tubes. Testing was performed to identify the operating parameters for which no damage would be caused to steel process lines. 1. INTRODUCTION Waterjet cleaning of steel tubes, piping and vessels is routinely conducted at pressures from 5,000 Waterjet Cleaning Of Steel Process Lines Without Damage To The Steel Wall by: D. Wright, J. Wolgamott, G. Zink, StoneAge, Inc., Durango, Colorado, U.S.A. Rotating Jet Damage at 140 MPa (20,000 psi), Drilled Steel Nozzles, Time Periods of 30 and 60 Seconds On the inside Industrial Vacuumers Consider Publishing Best Practices ........................................ pg. 5 NLB 605 Convertible Pump Sets Bar For Flow And Horsepower ............................ pg. 6 Jetstream Updates Waterblasters For Reduced Maintenance .................................... pg. 7 New Massive Pumps From KMT Waterjet Systems ................................................... pg. 8 Rotating UHP Water Jets Are Field-repairable ....................................................... pg. 11 Jetstream Names Krupowicz VP, General Manager ................................................ pg. 13 Flow International Launches Waterjetpro TM Line Of Cutting Tables ....................... pg. 15 World Of Concrete Debut For New Robot From Aquajet ........................................ pg. 16 Butech Pressure Systems Restructuring ................................................................... pg. 19 (continued on page 2)
Transcript
Published by theWaterJet Technology
Associationfor the benefit of its
members
APRIL 2006
906 Olive Street, Suite 1200 l St. Louis, MO 63101-1434, USA l Telephone: (314)241-1445, Fax: (314)241-1449
ABSTRACT
Steel process lines and tubesare commonly cleaned usingwaterjet systems with pressuresup to 40,000 psi. There is a riskof damaging these linesdepending on operatingparameters such as jet pressure,angle, rotation and rate oftraverse. These lines vary fromsmall diameter heat exchangertubes to larger pipes. Thehighest energy concentrationswith greatest risk typicallyoccur in the small diametertubes. Testing was performedto identify the operatingparameters for which nodamage would be caused tosteel process lines.
1. INTRODUCTION
Waterjet cleaning of steel tubes,piping and vessels is routinelyconducted at pressures from 5,000
Waterjet Cleaning Of Steel Process LinesWithout Damage To The Steel Wallby: D. Wright, J. Wolgamott, G. Zink, StoneAge, Inc., Durango, Colorado, U.S.A.
Rotating Jet Damage at 140 MPa (20,000 psi), Drilled SteelNozzles, Time Periods of 30 and 60 Seconds
On the insideIndustrial Vacuumers Consider Publishing Best Practices ........................................ pg. 5
NLB 605 Convertible Pump Sets Bar For Flow And Horsepower ............................ pg. 6
Jetstream Updates Waterblasters For Reduced Maintenance .................................... pg. 7
New Massive Pumps From KMT Waterjet Systems ................................................... pg. 8
Rotating UHP Water Jets Are Field-repairable ....................................................... pg. 11
Jetstream Names Krupowicz VP, General Manager ................................................ pg. 13
Flow International Launches WaterjetproTM Line Of Cutting Tables ....................... pg. 15
World Of Concrete Debut For New Robot From Aquajet ........................................ pg. 16
Butech Pressure Systems Restructuring ................................................................... pg. 19 (continued on page 2)
to 40,000 psi. The concerns byplant operators have beendamage by high pressurewaterjets and mechanical wearcaused by the rubbing of thenozzle against the wall of thetube. Another sometimesoverlooked failure mode of pipingand tubing is due to corrosionrelated to the plant process, inboth carbon steel and stainlesssteel materials. There have beeninstances of blame placed onwaterblast contractors for damagethat was actually due to corrosion,because the waterjet cleaningremoved the material from thecorrosion pits and cracks that hadbeen keeping the tubes from leakingthrough these tiny pits and cracks. Acorrosion damaged stainless steel tubeis shown in Figures 1 and 2. Thepitting caused by corrosion has
Waterjet Cleaning Of Steel Process Lines Without Damage To The Steel Wall, from page 1
Figure 1. Pitting Caused by Corrosion inStainless Steel Tube Figure 2. Detail of Corrosion Pits in
Stainless Steel Tube
relatively sharp edges. A waterjetattacks steel through the process ofcavitation erosion by water dropletimpact, which looks much moresmooth and rounded (see Figures 4, 6,9, 12, 14 and 15). The purpose of thistesting was to determine operating
parameters which will not result inwaterjet damage to the tubes, and toillustrate what the damage caused bywaterjet action looks like.
for all of your water blasting needs!
(continued on page 4)
Page 2 WJTA on the web: www.wjta.org April 2006
For surface preparation and industrial cleaning applications, contactAQUA-DYNE regarding the most innovative Water Energy products.
FEATURES • 40,000 psi • 200 gpm • 1000 hp • Vacuum attachments
TOOLS • Rotary Gun - 4 or 8 Nozzles • Aqua-Spider - Wall/hull cleaner • Mini-Scrubber - Hand held cleaner • RHD - Rotating pipe cleaner
2. TESTING
Tests were performed using a singlefixed jet and multiple rotating jets;Figure 3 illustrates the typical testarrangement for multiple rotating jets.The standoff distances used would betypical of tube and small pipe cleaningbut considered relatively close for pipesizes larger than six inches unlessprovisions were made to place the jetscloser to the pipe wall. For tests
Waterjet Cleaning Of Steel Process Lines Without Damage To The Steel Wall, from page 2
performed at and below 140 MPa(20,000 psi), two types of nozzle wereused, one being drilled steel of poorquality, and the second high qualitystainless steel nozzles with flowstraighteners. Tests performed at 250MPa (36,000 psi) used good qualitysapphire nozzles. The tube sampleson which the tests were conductedconsisted of new 304 stainless steeland 1018 DOM carbon steel, both1.88 in. inside diameter. The amountand type of damage was found to bequite similar in the stainless steel andthe carbon steel, so most of the testingwas done in the 1018 carbon steel toallow for better visual contrast. Thedamage was quantified and comparedin terms of depth of material removal.
3. RESULTS
3.1 Stationary Jets
The first of these tests used a poorquality drilled steel nozzle orifice,
typical of small tube cleaning nozzleswithout replaceable inserts. An orificesize of 1.07 mm (.042 in.) was drilledat 90° in the head and tested with thejet perpendicular to the tube wall, at astandoff distance of 9.6 mm (.38 in.)Tests were run on both carbon steeland stainless steel for periods of 10, 30and 60 seconds at pressures of 70, 105
Figure 3. Rotating Nozzle TestArrangement
Figure 4. Damage to Carbon SteelTubing, at 140 MPa (20,000 psi) withStationary Drilled Steel Nozzle, for TimePeriods of 10, 30 and 60 Seconds
(continued on page 10)
Page 4 WJTA on the web: www.wjta.org April 2006
From a contractor’s standpoint,you can hardly offer waterjet
service and not offer vacuum truckservice and vice versa,” says PatDebusk of Debusk Industrial Servicesand a board member of the WaterJetTechnology Association (WJTA). “Buteven though both types of equipmentwork the same job, their operatorsface different hazards.”
Clearly, both waterjet and vacuumtruck operators need safety training.High-pressure presents an obviousdanger to operators and the peoplearound waterjet equipment. High-powered vacuums are also potentiallydangerous, and some combinationvacuum units use high-pressure wateras well. Vacuum operators often workin confined areas and trenches, andmust cope with electrical cables,pressurized pipes, and potentiallyhazardous structures.
Twenty-one years ago, the newlyformed WJTA addressed safe andefficient waterjet use with its guide,Recommended Practices for the Useof Manually Operated HighPressure Water Jetting Equipment.This collection of best operatingpractices quickly became theindustry’s safety bible.
Guidelines
Now WJTA has begun exploringwhether it should create a similar setof guidelines for vacuum truckoperators.
“Our waterjet handbook is not atraining manual, but a set of tried andproven practices developed by peoplethroughout the industry, says WTJAAssociation Manager Ken Carroll.“Many of the vacuum companies havereally good safety programs that wecould pull together into a single guide.”
A need appears to exist. AlthoughOSHA does not specifically regulateportable equipment, managers andsupervisors must comply with relevantOSHA regulations. Larger companiesoften have specialists who monitorsafety requirements and managetraining and compliance. This is oftenmore difficult for smaller firms.
Adopting a single, generic set ofoperating guidelines and personnelclassifications would benefit bothsmaller and larger companies.
Advantages
To start with, managers would find iteasier to tell whether their safety
Industrial Vacuumers Consider Publishing Best Practices
“
(continued on page 17)
April 2006 WJTA on the web: www.wjta.org Page 5
he 605 Series water jet pumpunits from NLB Corp. offer
higher horsepower and flow than anyother convertible pump — up to 600hp and 143 gpm (447 kw and 541lpm). A simple conversion kit letsusers operate at any of five pressuresto suit their applications: 6,000, 8,000,10,000, 15,000, or 20,000 psi (414 to1,400 bar).
Since the conversion can becompleted with just six parts (and nomanifold change), operating efficiencyis high and maintenance is easy. TheNLB 605 has many wear-reducingfeatures, including a slow-runningtriplex plunger pump and hard-coatedvalves and plungers. Corrosion-
NLB 605 Convertible Pump Sets Bar For Flow And Horsepower
resistant stainless steel isused throughout the pump,instead of carbon steel.Minimum flow is 34 gpm(129 lpm).
The NLB 605 Seriesunits all feature an internalgear pac instead of atraditional external drive.Other important featuresinclude a heavy-duty poly-chain system with belt guard andwater pressure-actuated throttlecontrol to adjust output to operatordemand.
NLB Corp. manufactures a full lineof quality waterjetting systems and
accessories for contractor andindustrial uses. These include surfacepreparation, paint removal, tank andtube cleaning, concretehydrodemolition, concrete and pipecutting, and more. For moreinformation, visit www.nlbcorp.com.
T
NLB 605 Series water jet pump unit
Page 6 WJTA on the web: www.wjta.org April 2006
etstream of Houston, amanufacturer of high-quality
waterblast equipment, recentlyannounced several improvementsto Jetstream waterblasters thatincrease reliability and reduceroutine maintenance requirementsfor greater uptime and reducedowning and operating costs.
Several changes add to thereduction in maintenancerequirements. First and foremost,according to Tony Fuller, director,Industrial Sales & Marketing, isthat the PTO has been redesignedwith an oil-bath lubricated bearing.“Instead of requiring dailygreasing, you change the oil afterextended intervals, much as youwould do an engine oil change,” hesaid. “We realize that, in thereality of the contractor’s workday, daily maintenance may sometimesbe neglected. More than that, weknow that this maintenance can bedifficult to do in the field. This‘greaseless solution’ significantlyreduces daily maintenancerequirements and will extend the lifeof the power takeoff.”
Fuller pointed out other changes thatwill reduce routine maintenance andextend machine life, including the newshutdown harness, which is sealedfrom water and pre-tested to ensurereliable operation in virtually allconditions. The Uni-valve cartridgehas also been redesigned to last longer,while still offering the same mainte-nance characteristics as the original.
Another key improvement is theswitch to banded belts. “The bandingreduces the likelihood that the beltswill creep over on one another or roll,”Fuller said. “This means you get morelife out of the belts, less downtime andgenerally smoother, more consistentoperation.”
Jetstream Updates Waterblasters For Reduced Maintenance
A new control panel, consistentacross all models, iseasy to read andreach, so theoperator is betterable to observeand controloperations. New,long-life LEDlights are shockproof and energyefficient. “Whenit’s easier to see,operation issafer,” said Fuller.“And these lightsare designed tolast, withoutmaintenance.”
He noted thatlater this spring,Jetstreamwaterblasters willincorporatecertain additionalfeatures, includingan automatic belt
J tensioner, which keeps the beltsrunning tight on the idlers. Otherimprovements soon to be availableinclude an integral filter on the watertank and trailer-to-skid conversionkit.
Jetstream produces waterblastersup to 40,000 psi, along with parts andaccessories for Jetstream andcompetitive equipment. Productofferings include skid-and trailer-mounted units, pumps, control guns,valves, hoses, replacement parts andnozzles.
Jetstream of Houston is a subsidiaryof Federal Signal Corporation’s(NYSE:FSS) Environmental ProductsGroup, which includes ElginSweeper, Vactor Manufacturing,Guzzler Manufacturing, and LeachCompany. For more information, call800-231-8192 or visitwww.waterblast.com.
April 2006 WJTA on the web: www.wjta.org Page 7
MT Waterjet Systems, a manufacturer ofextreme-pressure waterjet equipment, has
introduced new massive pumps for waterjet cutting: theSL-V 150 hp and the SL-V 200hp. These are the latestadditions to the StreamlineTM series of intensifiers,providing more pump sizes to better accommodatespecific applications.
Designed for customers who need more horsepowerbut who do not want to increase the number of pumps,the new massive pumps eliminate the need to haveseveral smaller pumps driving large numbers of cuttingheads. These new pumps produce water under extremepressure using just two intensifiers, leaving room for abackup (redundant) intensifier. The net benefit is loweroperating costs.
The new pumps set a new industry standard for easeof operation by using the same, proven technology as thesmaller pumps along with the added benefits of: stackedintensifiers on the very front of the machines for easieraccess, electronic proportional control which automateschanging the pressure to any level desired, balancing andstroke control software, and doors with windows foreasy visual inspection.
When compared to other pumps, the new massivepumps in 150hp and 200hp sizes produce more highpressure water at a lower cost per gallon.
Additional features:
l Redundant Option – Add an extra intensifier asbackup, for a total of three intensifiers, and moreassurance that at least 2gpm will be available.
l Largest High Pressure Intensifiers – Output for justone intensifier is up to 2gpm, using any of up to
New Massive Pumps From KMT Waterjet Systems
three intensifiers. Total maximum output at any timeis 4gpm for the 200hp model and 3gpm for the150hp machine.
l Easier to Maintain – Thread-together cylinderdesign for ease of access to components, seals, andparts.
l Biggest Attenuator Capacity – Up to 1.5 gallons formore consistent pressure signal and smoother cuts.
KMT Waterjet delivers extreme-pressure waterjetsystems which have great reliability and ease of use atpressures up to 60,000 psi and provides high levels ofcustomer service.
KMT Waterjet Systems is part of the KMT Groupwhich markets, develops and manufactures advancedproduction solutions for the engineering industry withinprecision grinding, sheet metal working, tube forming,and waterjet cutting. The KMT holding company,Karolin Machine Tool AB, is quoted on the “O” list ofthe Stockholm Stock Exchange.
For more information, visit www.kmt-waterjet.com.
K
Page 8 WJTA on the web: www.wjta.org April 2006
OUR HOURS OF OPERATION?ALL OF THEM.
Mechanical breakdowns can result in lost time, money and opportunities. Nobody understands that better than Jetstream.
That s why we re the only company in the industry that provides replacement parts, accessories and technical support
around the clock. In this industry, you can t afford to be down. With our after-hours parts shipment and professional advice,
we can have you up and running in no time. No matter what time that may be. The Jetstream 24/7 Support Program.
If your equipment goes down, we ll be up. You can count on it.
For more information, contact a Jetstream representative at 800.231.8192,
or visit us at www.waterblast.com.
NS40451P1.indd 1 7/21/05 3:13:11 PM
and 140 MPa (10,000, 15,000, and 20,000 psi). Figure 4shows the damage created at 140 MPa (20,000 psi) with adrilled jet in carbon steel; the carbon steel results aregraphed in Figure 5. Figure 6 is a photograph of thedamage created at 140 MPa (20,000 psi) in stainless steel;the stainless steel results are plotted in Figure 7. Note thatthere is very little difference in results between the twomaterials. At 70 and 105 MPa (10,000 and 15,000 psi), nodamage was caused at the 10 second exposure, while slightdamage occurred at 140 MPa (20,000 psi). The damagecaused at 70 MPa (10,000 psi) can only be felt as surfaceroughness rather than depth; after exposure for 120seconds the damage did not increase.
The next series of stationary jet tests used a high qualitysteel nozzle with a flow straightener and an orifice diameterof .97 mm (.038 in.), exiting from a nozzle head at 90° tothe tube wall. Due to the nature of the cavitationmechanism by which the waterjet damages the tube wall,this more coherent jet did not produce any damage up to orincluding 140 MPa (20,000 psi) after 60 seconds when thestandoff distance was 9.6 mm (.38 in.) from the tube wall.Cavitation and damage did occur when this nozzle wastested with increasing standoff distance at 105 MPa(15,000 psi) for 30 seconds at each point. These resultsare shown in Figure 8.
The final series of stationary jet tests, conducted at 250MPa (36,000 psi), used a sapphire nozzle insert, diameter.61mm (.024 in.), tested at 80° to the surface of the tubewall. Results showed that allowing a nozzle operating atthis pressure to stop rotating or traversing can result insignificant damage to the tube wall. Figure 9 shows thetest sample used and the resulting damage. These resultsare plotted in Figure 10, along with the results at 140 MPa(20,000 psi) from the drilled jet tests for comparison.
3.2 Rotating Jets
Use of rotation as a means of keeping the jet moving overthe surface can greatly reduce or eliminate damage to steeltubes and pipes. Figure 11 illustrates the great differencebetween rotating and stationary jet damage; a stationary jetat 140 MPa (20,000 psi) can cause more damage thanrotating jets at 250 MPa (36,000 psi).
Damage by rotating jets will still be incurred if the tool isleft rotating in the same place; the amount of time to causedamage is dependent on the pressure. At 70 MPa (10,000psi) a head rotating 500 rpm with three drilled steel jets of.84 mm (.033 in.) diameter (30 kW) at 85° in the samepath, at a standoff distance of 9.6 mm (.38 in.), did notcause any damage after 4 minutes in the same location,
Waterjet Cleaning Of Steel Process Lines Without Damage To The Steel Wall, from page 4
LB Corp. has introduced two ultra-high pressure(UHP) waterjet accessories that improve
performance and can be repaired in the field in under fiveminutes. The Viper 40™, the first self-rotating head tooperate at pressures up to 40,000 psi (2,800 bar), easilyattaches to astandard NLBNCG40-286lance. Thisnew lance issimpler thanair-drivenUHP lancesand eliminatesthe expense ofan air source.
The Viper40™ has around stainlesssteel bodywith recessednozzle inserts,to reduce damage from nozzle strikes. Its combination ofrotating UHP action and a wide spray path make itexceptionally effective in a wide range of product removalapplications. Unlike previous SPIN-NOZZLE® heads,which must be returned to the factory for repairs, the Viper40™ can be repaired in the field in less than five minutes.
The NCG40-286 lance is also field-repairable, thanks toa unique quick-change cartridge seal that can be replacedin just 60 seconds. This lightweight lance features apatented trigger design (Patent No. 5,636,789) that allowsthe operator to dump pressure instantly. Other operator-friendly features include easy trigger actuation andadjustable shoulder stock and handgrip.
For more information, visit www.nlbcorp.com.
Rotating UHP Water Jets AreField-repairable
Figure 8. Effect of Standoff Distance with a StationaryHigh Quality Steel Nozzle With a Flow Straightenerat 105 MPa (15,000 psi)
Figure 9. Damage at 250 MPa (36,000 psi), Time Periodsof 10, 30 and 60 Seconds
Figure 10. Stationary Sapphire and Drilled NozzleDamage to 1018 Carbon Steel Tube
Waterjet Cleaning Of Steel Process LinesWithout Damage To TheSteel Wall, from page 10
(continued on page 14)
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The Jet News is published by the WaterJet TechnologyAssociation (WJTA) and is a benefit of membership inthe Association.
Alejandro VegaBefesa TLIAvda. Ingenieros Marcos Seguinnave 2. Pol. Ind. Las Salinas de Levante11500 Puerto de Santa MariaCadizSpainPhone: [34](956)543776Fax: [34](956)543681
WJTA Welcomes New Members
Corporate Alternate
Corporate
Clinton BirdVeolia Environmental Services Industrial Services806 Hoods Creek PikeAshland, KY 41101Telephone: (606) 329-1306Fax: (606)325-8475
Randy MillarVeolia Environmental Services Industrial Services3410 South Service RoadBurlington, ON L7N-3T2CanadaTelephone: (905)633-7172Fax: (905)633-7720
Ken MitchellVeolia Environmental Services Industrial Services511 E. Channel RoadBenicia, CA 94510Telephone: (707)748-3715Fax: (707)748-1681
Corporate Individual
(continued on page 18)
Veolia Environmental Services IndustrialServices formerly ONYX Industrial Services Inc.
etstream of Houston, LLP ispleased to announce the
appointment of Bill Krupowicz to vicepresident, general manager.Krupowicz replaces Ron Schmidt,who has been named vice president oftechnology development at the FederalSignal Environmental Products Group.Jetstream is a subsidiary of this group.
In his new role, Krupowicz willassist Jetstream with current growthinitiatives as the company continues topursue a global leadership position inthe high-quality, high-pressurewaterblasting equipment industry.Krupowicz, who joined Federal Signalin 2000, was most recently vicepresident, general manager of LeachCompany, another subsidiary of theFederal Signal Environmental ProductsGroup.
“Bill brings a wealth of engineering,product management and internationalbusiness knowledge to Jetstream,”said Mark Weber, president, FederalSignal Environmental Products Group.“His experience is a great complementto Jetstream, which has significantrevenue growth opportunities in newdomestic applications and internationalmarkets.”
Jetstream Names Krupowicz VP, General ManagerJetstream manufactures industrial
high-pressure waterblasting equipmentoperated at pressures up to 40,000 psifor a wide range of industrial cleaningand surface prep applications. Productofferings include a complete line ofskid- and trailer-mounted pump units,
control guns, valves, hoses,replacement parts and nozzles.
For more information, call 1-800/231-8192, or visit Jetstream online atwww.waterblast.com.
Mark Your Calendar
2007 WJTAAmerican Waterjet
Conference
August 18-22, 2007Marriott HoustonWestchase HotelHouston, Texas
J
April 2006 WJTA on the web: www.wjta.org Page 13
w w w . n l b c o r p . c o m
NLB. The Contractor’s Choice.
Experienced contractors can tell you: the first name in water jet solutions is NLB.
From immediate equipment needs to simple questions, help is only a click away. NLB is the source for:
• top-quality pumps and accessories (to 40,000 psi) for virtually any job
• 1-man pump conversions• convenient rentals, parts and service• industry-leading R&D• on-line water jet tips and forumsFor a 24/7 link to the most productive water jet solutions,
visit www.nlbcorp.com. Or speak with one of the NLB pros, toll-free, at 1-877-NLB-7988.
and only slight damage had occurred after 6 minutes. Withthe same conditions at 105 MPa (15,000 psi) and .79 mm(.031 in.) diameter jets (48 kW), no damage was causedafter 60 seconds, with slight damage after 120 seconds, andat 140 MPa (20,000 psi) with .79 mm (.031 in.) diameterjets (74 kW), slight damage was caused after 30 seconds.The damage produced at the latter condition is shown inFigure 12. The plotted results are shown in Figure 13 inaddition to those obtained from a rotating head at 250 MPa(36,000 psi) with three nozzles, .48 mm (.019 in.) diameter(62 kW) at 80° to the tube wall with 9.6 mm (.38 in.)standoff distance. At 250 MPa (36,000 psi), a smallamount of damage was caused after 10 seconds, and a fairamount was created after 60 seconds. Figures 14 and 15show the test sample used and the resulting damage.When operating at 250 MPa (36,000 psi), even withrotation, the tool should be kept moving along the tube.
3.3 Jet Angle
The effect of jet angle of impingement on the tube wallwas studied at 250 MPa (36,000 psi) with rotating jets todetermine if a shallow angle resulted in reduced damage.A single .61 mm (.024 in.) sapphire nozzle was used. At 10degrees, no damage occurred after 60 seconds ofexposure, but a small amount of damage did begin to occurat 20 degrees after 30 seconds, and after 10 seconds with a30 degree angle. These results are shown in Figure 16.
4.0 CONCLUSIONS
Waterjet damage to steel tubing and pipe is quite dependenton the operating pressure, rotation or other motion of thejet, and the amount of time the jets are left in the sameplace. Damage is also dependent on the standoff distanceand somewhat dependent on the quality of the jet. There isa fairly high risk of damage at 250 MPa (36,000 psi); thejets must be kept continuously rotating and traversing alongthe tube or pipe; if the rotation or linear motion stops for asmuch as 10 seconds, damage may be caused. There is adecrease in risk when the pressure is lowered to 140 MPa(20,000 psi); however, a stationary jet is still likely to causedamage and the operator should not allow a rotating tool tobe left in the same place for 30 seconds or more. The riskdecreases considerably further at 105 MPa (15,000 psi);rotating jets require over a minute in the same location tobegin to create damage, while a stationary jet could cause asmall amount of damage after 30 seconds. Operatingpressures at or below 70 MPa (10,000 psi) are at veryslight risk of causing damage with any combination ofconditions.
Waterjet Cleaning Of Steel Process Lines Without Damage To The Steel Wall, from page 11
Figure 11. Rotating Jet Damage Compared to Station-ary Jet Damage
Figure 12. Rotating Jet Damageat 140 MPa (20,000 psi), DrilledSteel Nozzles, Time Periods of 30and 60 Seconds Also pictured on thecover
Figure 14. Rotating Jet Damage at 250 MPa(36,000 psi), at Time Periods of 10, 30 and 60Seconds
(continued on page 15)
Page 14 WJTA on the web: www.wjta.org April 2006
Figure 15.Detail ofDamage by 250MPa (36,000psi), RotatingJet after 30Seconds
Figure 16. Effect of Jet Impingement Angle at 250MPa (36,000 psi) with Single Rotating Jet
Waterjet Cleaning Of Steel Process LinesWithout Damage To The Steel Wall, from page 14
April 2006 WJTA on the web: www.wjta.org Page 15
Flow International Launches Waterjetpro™ Line Of Cutting Tableslow International Corporation(NASDAQ: FLOW) has
announced the launch of itsWaterjetPRO™ line of waterjetcutting tables.
For less than the price of a usedwaterjet, WaterjetPRO™ offersaffordable tables that are dependable,fast and accurate and include suchfeatures as a jogging pendant andprogrammable Z-axis. WaterjetPROtables are made possible thanks toFlow’s new program, Powered byFlow™, which enables machine toolproviders to integrate Flow’s ultrahigh-pressure (UHP) pump technology aspart of their existing product lines.
Powered by Flow™ givescompanies looking to expand theircapabilities a consistent, reliablesource of ultrahigh-pressure. In
addition, customers of thisprogram will receive the awardwinning, high quality serviceprovided by Flow including 24/7online parts ordering, trainedfield service engineers locatedaround the country, and superiortechnical support anddocumentation.
“WaterjetPRO™ cutting tablesoffer companies previouslyunable to afford waterjet machines thebenefits of ultrahigh-pressure waterjettechnology, keeping them competitivein today’s manufacturingenvironment,” said Marjorie Millay,product manager, Flow International.
Target markets for WaterjetPRO™tables include stone, tile anddecorative glass companies; small jobshops; sign shops; university and
technical colleges; R & D areas withinmanufacturing operations; companiesseeking economical methods forprototyping, producing small batchesand allowing suppliers to quicklydeliver product while setting up highcapacity cutting such as stamping ordie cutting; and anyone seeking a fast,flexible way to cut soft materials.
For more information, visitwww.flowcorp.com.
F
WJTA Administration
Vice-President
Pat DeBusk(281)842-8000
Chairman of the Board
John Wolgamott(970)259-2869
President/Jet News Editor
George A. Savanick, Ph.D.(952)432-7594
Secretary
Craig Anderson(281)925-4501
Lydia M. Frenzel, Ph.D.(512)392-2210
Mohamed Hashish, Ph.D.(253)850-3500
Bill McClister(713)307-2142
2005-2007 DirectorsHugh B. Miller, Ph.D.
(520)621-4689
Carl Olsen(253)872-2300
Forrest Shook(248)624-5555
Association ManagersMark S. Birenbaum, Ph.D. l Kenneth C. Carroll
(314)241-1445
Andrew F. Conn, Ph.D.(410)532-3452
Thomas J. Kim, Ph.D.(401)874-5991
Emeritus Members
Thomas J. Labus(262)245-9702
Fun-Den Wang, Ph.D.(303)279-9415
David Summers, Ph.D.(573)341-4314
Treasurer
Larry Loper(800)289-7447
he WJTA Safety Committeehereby solicits comments
regarding improvements to thepublication, Recommended Practicesfor the Use of Manually OperatedHigh Pressure WaterjettingEquipment. While RecommendedPractices is reviewed periodically atthe biennial conferences of theWaterJet Technology Association, yourcomments and suggestions forimproving the publication are invitedand welcome anytime.
Please address your comments andsuggestions to: Safety Committee, c/oWJTA, 906 Olive Street, Suite 1200,St. Louis, MO 63101-1434, fax:(314)241-1449, e-mail: [email protected],web site: www.wjta.org.
Tew robot from Aquajeteliminates the need for hand
trimming and offers more stableoperation during vertical indexing.
A new top-of-the-range HVD robotfrom hydrodemolition specialistAquajet made its debut at the recentWorld of Concrete Congress in LasVegas, Nevada.
The new model features animproved front skirt and power head,offering increased versatility andeasier access up to the wall edge andinto corners. This eliminates the needfor final hand trimming any untreatedareas of up to 10 cm left by previousmodels against the wall edge.
A new elevator hoist verticallypositions the cutting head. Itincorporates a sturdierconstruction to hold the headmore securely when indexingup to 6m freestanding height,ensuring more stable operationand eliminating any flexing andmovement.
A stronger dual drive systemoffers increased hoist safety inthe event of a failure with thesecond unit automaticallystarting.
The diesel-powered HVDrobot also features the provenhigh pressure lance controlsystem to provide enhancedsmooth and exact movement bythe highly efficient cutting head.
A splashguard ensuresreduced splash by water anddebris.
The simplified computercontrol system assists the
World Of Concrete Debut For NewRobot From Aquajet
operator in avoiding mistakes inprogramming and the use of thehydrodemolition robot.
The new unit is also shorter to offerincreased mobility.
New US distributor
The launch of the new robot atWorld of Concrete also marked thefirst appearance by the newlyappointed USA distributor, PutzmeisterAmerica Water Technology Division.
For further information pleasecontact: Stefan Hilmersson, AquajetSystems AB, Brunnsvägen 15, SE-57015 Holsbybrunn, Sweden, Tel: int +46(0)383 508 01, Fax: int +46 (0)383 50730, email: [email protected].
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Page 16 WJTA on the web: www.wjta.org April 2006
IMPORTANT NOTICEREGARDING SPAM
Email addresses and other member contactinformation published in the WJTA MembershipDirectory is meant to encourage helpful, informativecommunication between members. The informationis not provided to circulate spam or junk mail.
The WJTA leadership requests that members respectthe contact information of fellow members and not usethat information for the dissemination of spam or junkemail. Membership information is not meant to becirculated beyond the WJTA membership.
procedures were the best way to meetOSHA and other regulations. “Whenwe issued our waterjet guidelines 21years ago, many companies thatthought they were in compliance reallywere not,” recalls Debusk.
Third party recommendations alsoprovide greater credibility, says BillMcClister, Onyx Industrial ServicesVice President of Support Servicesand WJTA board member. “TheWTJA is a disinterested third partyinvolved with technical education. Ithas nothing to gain from how it writesits recommendations,”he explains.
This is especiallyimportant if a lawsuit arisesfrom a vacuum-relatedaccident. Without guidelinesthat define best practices,lawyers may challengecompanies to show that theytook all necessary safetyprecautions.
Established, industry-wideguidelines provide abenchmark for industrialcleaning companies to showthey operate safely. “Ourguidelines have been cited incourt cases as evidence that acompany was followingrecommended practices,” saysCarroll.
Even more importantly, saysMcClister, collaborating onbest practices gives the entireindustry a way to improve itsprocedures. “We’ve all mademistakes, we’ve all hadaccidents,” he explains. “Eachone is a black eye for theentire industry. By workingtogether, we can create acentral clearing house where
we can learn from our individualmistakes and improve safety foreveryone.”
Moving Forward
The WJTA plans to bring togethervacuum equipment operators, end-users, and manufacturers in Chicagothis August to discuss potentialguideline development.
“While we will go into the meetingwith an agenda, our real goal is tolisten to what the industry wants fromour organization,” says Carroll. “Most
industrial cleaning companies we’vetalked with seem interested.”
“If you’re a leader in this industry,you certainly want to be involved,”says Debusk. “This is a chance tostate your case and help make ourindustry safer and more efficient.”
If you want to learn more, call KenCarroll, LeAnn Hampton, or MarkBirenbaum at WJTA at 314-241-1445or e-mail [email protected].
Reprinted by permission of Jetstream ofHouston, a subsidiary of Federal Signal
Corporation’s Environmental Products Group.
Industrial Vacuumers Consider Publishing Best Practices, from page 7
April 2006 WJTA on the web: www.wjta.org Page 17
Gary NotoVeolia Environmental Services Industrial Services3018 N. Hwy 146Baytown, TX 77520Telephone: (713)307-2145Fax: (713)307-7260
Bob TurnerVeolia Environmental Services Industrial Services29906 North Legends Chase CircleSpring, TX 77386Telephone: (713)307-2127Fax: (713)307-7644
Patrick AdamsAll State Technology, Inc.10 Lark LaneOak Ridge, NJ 07438Telephone: (973)697-8989Fax: (973)208-9542
Sean BenoitPSC330 Walcot R.D.West Lake, LA 70669Telephone: (337) 882-1313Fax: (337) 8821314
John DemakasDemakas Plumbing & Heating Inc.2370 Oakdale AvenueSan Francisco, CA 94124Telephone: 4152822121Fax: (415)282-2177
George A. Savanick, Ph.D.,ChairmanLydia Frenzel, Ph.D.Rick HeinJenny HoustonMarilee JardineKevin ObornForrest ShookDavid A. Summers, Ph.D.Gary TootheBob Turner
Waterjet Short CourseProgram CommitteePlans and oversees theshort course programs heldin conjunction with thebiennial WJTA Conferences.
Lydia Frenzel, Ph.D.Thomas Kim, Ph.D.Hugh B. Miller, Ph.D.David A. Summers, Ph.D.John Wolgamott
WJTA Welcomes New Members, from pg. 12
Individual
WJTA Committees(as of March 21, 2006)
Page 18 WJTA on the web: www.wjta.org April 2006
Following is a list of WJTA committees and the memberscurrently serving on those committees. All WJTA membersare invited to participate on committee or committees oftheir choice. Contact the WJTA office to volunteer for acommittee.
To volunteer for any of these WJTA Committees,contact: WJTA Committees, 906 Olive Street, Suite 1200,St. Louis, MO 63101-1434, phone: (314) 241-1445, fax: (314) 241-1449, email: [email protected], web site: www.wjta.org.
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utech Pressure Systems hasbeen a division of Haskel
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The Butech Pressure Systemssales and engineering organizationwill remain in Erie, Pennsylvania, andit will continue to need parts andservices delivered there for theirwork.
As of January 1, 2006, the ButechPressure Systems productsmanufacturing organization wasrestructured.
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The assembly and tubingoperations will be transferred to theHaskel International plant inBurbank, California, with ownershipcontinuing under HaskelInternational, Inc.
Advanced Pressure Technologies,LLC in Erie will continue as aprimary supplier of machined partsfor the Butech Pressure Systemsproduct line, under contact withHaskel International, Inc.
Butech PressureSystemsRestructuring
B
April 2006 WJTA on the web: www.wjta.org Page 19
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