l Telephone: (314)241-1445, Fax: (314)241-1449 Hydro ... news 01-07/JetAug06.pdf ·...

Published by theWaterJet Technology

Associationfor the benefit of its

members

AUGUST 2006

906 Olive Street, Suite 1200 l St. Louis, MO 63101-1434, USA l Telephone: (314)241-1445, Fax: (314)241-1449

Long Reach Applications

Water Shutoff Repair

On the insideAWJ Cutting Of Thick Materials .. pg. 5

Twin Aqua Cutters SolveCorrosion Problems On GermanBridge ...................................... pg. 8

PaR Systems PurchasesUnidynamics ............................ pg. 9

New Multi-Gun Valve DesignedFor Higher Flow .................... pg. 10

New Products, Services ............. pg. 12KMT Receives Substantial Order

For High Pressure InjectionPumps .................................... pg. 16

Call For Papers ......................... pg. 18Heavy Clay Soil Repairing Steam Line Under Foundation

Minimal Disruption To Landscape

Drilling Mud Removal

Hydro-Excavation Applications

See article, “Hydro-Excavation: ASafe, Cost-Effective AlternativeFor Underground Constructionand Municipal Use,” page 2.

Photographs provided courtesy of VactorManufacturing, Inc., a Division of FederalSignal Corporation.

Utility Construction

Introduction

Every day, contractors, munici-palities and utilities excavate forinstallation of underground facilities, ormust locate existing pipes, cables andlines for maintenance and repairs. Inthe past, this usually involved diggingby hand (often a slow and tediousprocess) or with a mechanicalexcavator, backhoe or similarmachine.

Every year, there are numerousreports of injuries, deaths, explosionsand fires from unsafe or poorlyplanned excavations that strikeunderground facilities or result fromcollapsed trenches. Many of theseincidents can be avoided and the risksminimized by utilizing techniques suchas vacuum excavation.

Definitions

Vacuum excavation is a generalterm that may include processesusing either water (hydro-excavation) or high-pressure air toloosen soil. In either case, an airvacuum is used to move the loosesoil and rocks, often into a debristank for later disposal or back-fillingthe hole that’s been made.

Hydro-excavation is a process thatutilizes pressurized water to breakup and remove the soil via airconveyance (vacuum) into a debristank, providing a non-destructivemeans to safely locate utilities andprecisely excavate an area.

This article will focus specifically onhydro-excavation and its origins,benefits, safety factors, applicationsand economic value.

Hydro-Excavation: A Safe, Cost-Effective Alternative ForUnderground Construction And Municipal Use

Historical Perspective

Hydro-excavation as we know ittoday can trace its growing popularityto the Canadian oil and gas industry,which realized years ago theefficiency of using a hydro-excavationmachine to “daylight” buried gas pipesand other utility lines. With coldweather and permafrost,petrochemical plants and facilities inCanada found that using heated watermade hydro-excavation the only viableoption to excavate year-round.

In the early 1960s, catch basincleaners were adapted for hydro-excavation use, but the technologywas crude. Vactor® built its firsthydro-excavation machine, theExcaVactor,” in 1969. However, themarket then was immature and it wasthe only unit built.

In the 1970s and ’80s, customersmodified vacuum trucks and sewercleaners for hydro-excavation use.Some took vacuum components offthe trucks and mounted them on all-terrain vehicles to get into remotelocations. In the 1990s, a number ofcompanies saw a growing demand forhydro-excavation machines and beganmanufacturing truck- and trailer-mounted units in varyingconfigurations.

By 2000, hydro-excavation was widelyused across Canada and was movinginto the United States. In recent years,the practice has rapidly gainedacceptance in the U.S.

Safety and Damage Prevention

Improved safety and damageprevention top the list of key benefits

of hydro-excavation. An undergroundutility strike can be catastrophic,affecting thousands of people andcosting millions of dollars. A singleincident may cause personal injury ordeath, property damage, lost workopportunity, community disruption,ecological damage and insuranceliability.

More than 40 percent of pipelinesystem leaks and ruptures are causedby damage from outside force, andmore than half of all cable serviceoutages are caused by excavationdamage.

While disruption of a telecommuni-cations network is not as inherentlydangerous, it can be expensive andinconvenient, impacting traffic controlsystems, health services andemergency response activities. Theimportance of minimizing undergroundutility strikes and their consequencescannot be denied.

Using hydro-excavation in suchsituations can avoid:

• “Hits” or “strikes” on undergroundutility lines, cables and pipes

• High costs to repair damagedinfrastructure

• Costs and inconvenience ofinterrupted utility services

• Serious injury or death to workersand the public

• Liability and increased insurancecosts

• Loss of a company’s reputation,revenues and employee morale

In addition, hydro-excavation canimprove overall productivity andefficiency for contractors,municipalities and utilities.

(continued on page 4)

WJTA on the web: www.wjta.org August 2006

Government regulation

The U.S. presently has more than 14 million miles ofburied utilities and pipes. Current laws prohibit the use ofmechanical means to dig within 18 inches of buried cableand pipe in the U.S., and 45 cm in Canada. Buried utilitiesare often miss-marked or maps are inaccurate, requiringunderground facilities to be located by sight, either by hand-digging or another means, to maximize safety. This is oftencalled “daylighting.” Unfortunately, digging by hand is oftentime-consuming, and mechanical excavation is inherentlyrisky.

The U.S. Department of Transportation’s Damage Pre-vention Quality Action Team views the situation this way:

The United States has a vast undergroundinfrastructure of pipelines, conduits, wires, andcables that affect every individual. Thisunderground infrastructure is critical to our wayof life, constantly providing oil and natural gas,telecommunications, electricity, water, sewage,cable TV, and other vital products and services.Disruption of any of these underground facilitiescould affect the safety of the public, theenvironment, and continued service reliabilitythat could impact our entire economy.

One of the leading causes of disruption to ourcountry’s underground facilities is external forcedamage (sometimes called ‘third-party damage’)that occurs during excavation activities. Bothindustry and government have recognized this.Although such damage occurs far too frequently,it is usually preventable. Responsibility forpreventing excavation damage is shared by allstakeholders. Advanced planning, effective useof one-call systems, accurate locating andmarking underground facilities, and the use ofsafe-digging practices can all be very effectivein reducing underground facility damage. In moststates, increased and mandatory use of the state’sone-call system has significantly reduced theincidence of excavation damage. However,damage still occurs.

Risky business

Strikes on natural gas lines are particularly hazardous andoccur all too often, resulting in significant property damage,

injuries and even deaths. The tables below illustrateincidents for natural gas distribution pipelines during theyears 2000-2004.

As these statistics show, property damage from gasdistribution pipeline incidents more than doubled from 2003to 2004, from over $22 million to $54 million. Of the 171incidents reported in 2004, 48 were caused by third-partyexcavation, resulting in more than $10.6 million in propertydamages.

Applications

Virtually every construction contractor, municipality andutility does underground construction and/or has subsurfacefacilities. At times, a subcontractor with expertise or

Hydro-Excavation: A Safe, Cost-Effective Alternative For Underground ConstructionAnd Municipal Use, from page 2



n article written by Hashish*presented interesting results on

precision cutting of thick glass, titani-um, and steel with abrasive waterjets(AWJ). Here are the highlights.

Pictures of some examples of reallythick materials cut with AWJs wereshown, including 450 mm (18”) thickaluminum (cut in single passes), 300mm (12”) thick glass (cut in twopasses from top and bottom), and 1meter (39.4”) thick concrete (cut withpenetrating tool).

Jet trail-back, taper, and surfacefinish were identified as the three maincharacteristics of AWJ cuts. Resultsof 14 cutting tests on a 300 mm thicksample of titanium with differentabrasive flow rates and cutting speedswere presented. The trail-back curvesmatch the prediction of a universalAWJ kerf equation. The kerf widthprofiles show some similarity to kerfwidth profiles predicted with a kerf

shape model ofpure waterjets.This purewaterjet modelwith somemodificationswas applied to AWJs. Tilting thenozzle forward or sideways canminimize the trail-back and taper.

An equation to predict propermixing tube length for achieving acertain mixing efficiency was alsopresented. The table above showspredicted mixing tube lengths for amixing efficiency of 90% (i.e. particlevelocity at 90% of its maximumpossible velocity). According to thistable, longer mixing tubes are requiredwith larger particles and shortermixing tubes can be used with higherabrasive flow rates.

Examples of AWJ nozzles used forthick material cutting were shown.Mixing tubes for these nozzles were

AAWJ Cutting Of Thick Materials

300 mm (12”) and 450 mm (18”)long. Two abrasive inlets were used tofeed abrasive into each nozzle. As anexample of work done with thesenozzles, a hexagonal honeycombshape with 2-mm thick struts was cutout of a 300 mm thick glass block. Atilting cutting head was used to correctfor trail-back and taper.

* Hashish, M. (2004) Precision cutting of thickmaterials with AWJ, Proceedings of the 17th

International Conference on Water Jetting, ColinGee (Ed.), Proceedings of the 17th InternationalConference on Water Jetting — Advances andFuture Needs, Mainz, Germany, 7th - 9thSeptember. p. 33-45.

Article reprinted with permission from theQuality Waterjet Newsletter, July 4, 2006,published by QualJet LLC, www.qualjet.com.

August 2006 WJTA on the web: www.wjta.org

they believe to be six feet underground, then backfill withclean material and restore to its original condition.

Option 1: Conventional Method

Open hole with sloped sides to allow for legal hand diggingfor exposure of utility.

specialized equipment is needed to handle certainexcavation jobs. There are many potential applications inwhich hydro-excavation is a viable option. These include:

• Line location, installation and repair for utilities andpipelines

• Sewer and pipe rehabilitation• Telecommunications maintenance and repair• Slot trenching• Waterline maintenance and repair• Directional drilling• Sign and pole installation• Landscaping (i.e., digging holes for new trees and

shrubs)• Repair work or excavation in tight spaces and congested

areas• Potholing

With hydro-excavation, buried natural gas and petroleumpipelines can be uncovered without risk of puncture. Fiberoptic cables, telephone lines, water mains and other utilitiescan be efficiently located without damage. This methodalso causes less surface damage, traffic disruption andother potential digging drawbacks.

Operators can use hydro-excavators to dig withprecision, offering a less invasive method for slot trenching,potholing or pipe location. In grassy areas, sod can bereplaced and, within a week, a casual observer wouldnever know a hole had been dug there.

Cost/Benefit Analysis

To effectively evaluate the costs versus benefits ofhydro-excavation compared to mechanical excavationmethods, worksheets such as the ones in the followingcolumn and on page 11 can be used. The first worksheet ineach of the two sets includes typical figures for theexample shown. Use the second, blank worksheets to plugin your own numbers and compare conventional digging andhydro-excavation.

In most cases, a yard-for-yard comparison between ahydro-excavator and a bucket machine favors the bucketmachine. However, the actual removing of the dirt is only asmall part of the overall job.

Let’s look at the following job as an example: AcmeUtility Co. has contracted you to uncover a 2 ft. x 2 ft. area

Limited Access Areas

Multiple Utility LinesSafely Exposed

Live Gas Lines Exposed




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NS40451P1.indd 1 7/21/05 3:13:11 PM

wo hydrodemolition robots fromSweden’s Aquajet Systems are

being used on a German bridge projectclose to the Austrian border removingmore than 140 m3 of badly corrodedconcrete from the parapet beams andhard-shoulders under a very “tight”contract.

Built in 1957, the Loithal Bridge onthe busy Salzburg - Munich A8autobahn, is experiencing severecorrosion problems on the parapetbeams and hard-shoulders, caused bysalt laid over the winter months tocombat the heavy snowfalls. The salthas also caused considerable corrosionto the parapet’s rebar.

In a two-month contract –scheduled to have started in April 2006but set back more than a month due toheavy snowfalls – main contractor,Kassecker, awarded thehydrodemolition contract toHochdruck Industrie Service GmbH.Based in Frankfurt, Hochdruckentered the hydrodemolition sector in2004. According to Project ManagerDirk Simon, approximately 40% ofincreased turnover is from newhydrodemolition business.

Beset with problems, including theinitial bad weather at the start of the

Twin Aquajet Robots Solve Corrosion Problems On German Bridge

contract, Hochdruck had initiallyproposed using its single Aqua CutterHVE Evolution and electronicallycontrolled robot.

“We soon recognized the need for asecond unit so as to be able to tackleboth sides of the autobahn at the sametime, in an already very short contractperiod,” said Dirk Simon.

Making use of the Aqua CutterHVE Evolution, water is blasted atextremely high pressure into theconcrete. The high pressure water isdelivered to the tracked robot throughflexible high pressure hoses. Inside therobot there is a gimbal-mounted lancewith a nozzle attached. The operators

can select the nozzle operating widthto meet the requirements of the jobthey are working on.

The nozzle compresses the jet ofwater and delivers over 200 litres aminute under 1000 bars of pressure.The lance is mounted to a rollerassembly, which traverses on a beamdelivering a consistent high pressurejet to the concrete beneath aprotective skirt. The robot is operatedthrough either a wireless or alightweight hard-wired remote system,which also features a shoulder harnessfor operator comfort.

The operator can program the robotto vary the angle of penetration, thelance speed and the degree ofoscillation. This allows the contractorto determine the number of passesneeded to meet the specification forremoval – usually this means removingthe unsound concrete while leaving thesound concrete with a superiorbonding surface.

“This is the beauty of this robot,”says Jan-Åke Petersson, “It cleans theconcrete and base underneath andleaves a craggy surface, which gives amuch greater bonding area than asurface prepared with jackhammers orsandblasting machines.”

He adds, “There is no risk that thearea treated will have any impact orvibration damage – if you strike rebarwith a jackhammer it is most likelythat the vibrations will travel deeperinto the sound concrete leading tomicro-fractures and loosening of therebar. This does not happen using theAqua Cutter.”

Both Aqua Cutters are supported ina tailor-made gantry and steel surfacepreparation deck covering thecomplete width of the autobahn. Thegantry and deck is 20 m wide and ishydraulically moved forward 20 m at atime. In addition to providing a

T



The 286 m long Loithal Bridge on Germany’s A8 autobahn was experiencing corrosion problems withrebar along the parapet caused by salt laid over the winter months to combat the heavy snowfall.

Two hydrodemlition robots from Aquajet enclosedwithin a gantry above the parapet on both sidesof the bridge are removing more than 140m3 ofbadly corroded concrete.

aR Systems, Inc. has announcedthe acquisition of the assets of

Unidynamics, Inc., a leading U.S.material handling and specialtyequipment company, based in Conroe,Texas. The purchase was funded withcapital from PaR Systems financialpartner, American Capital Strategies(NASDAQ: ACAS).

Unidynamics joins Jered LLC, awholly owned subsidiary of PaRSystems, to provide specialty materialhandling design, manufacturing, andservice to the marine and militarymarkets. Recently, Unidynamics madespecialized handling equipmentinstalled in military applicationsincluding the Littoral Combat Ship, thefirst of the U.S. Navy’s planned next-generation surface combatants.

“The acquisition of Unidynamicsenhances PaR Systems’ existing

automation and material handlingsolutions and strengthens our supportfor military and commercial marinecustomers,” said Rick Edger, Jeredpresident and head of PaR Systems’military division.

PaR Systems purchasedUnidynamics’ assets from their section363 bankruptcy sale process. PaRSystems plans to act quickly tocomplete Unidynamics’ immediateprojects before relocating the facilityto Jered’s Brunswick, Ga., location.

For 45 years, PaR Systems hasprovided automation and materialhandling solutions and remains focusedon specialized robotics, materialhandling, and crane equipmentapplications to improve customerquality, safety and productivity.Headquartered in Shoreview, Minn.,

PaR Systems serves highly specializedindustries including aerospace, marine,semiconductor, food and beverage,military, government, research,semiconductor, medical, laboratory andmanufacturing. In August 2005, PaRSystems acquired the assets of JeredIndustries, Inc. and expanded itsautomation and material handlingexpertise into the military andcommercial marine industries. Formore information, visit www.par.com.

Unidynamics, Inc. has designed andbuilt innovative solutions and world-class equipment for material handlingapplications. These includeapplications for such markets asmarine, offshore energy, hazardousmaterials, aerospace, pleasure cruiseships, and others requiring customizedsolutions.

PaR Systems Purchases Unidynamics

P

Acquisition Advances PaR Systems March Into Military Markets


new high-flow multi-gun valvefrom NLB Corp., the MGV12-

3000, lets users operate two or morewaterjet lances from a single high-pressure pump unit at flows as high as60 gpm (227 lpm). The new valve isdesigned for operating pressures from4,000 to 12,000 psi (276 to 830 bar),and can be repaired in the field in lessthan five minutes.

The MGV12-3000 can be used withany dump-style waterjet lance, and thenozzles in the lances can be differentsizes. Each operator independentlycontrols the loading and dumping of hisown lance. The assembly comescomplete with mounting plate, guard,pressure gauge, and NPT couplers forinlet/outlet connections, and weighsjust 27 lbs. (12kg).

The new multi-gun valve features adisposable, screw-in cartridge that canbe replaced at a job site in under fiveminutes. It is the same, proven quick-change cartridge used in the latestNLB lances and foot control valves,minimizing inventory needs.

NLB Corp., a leader in high-pressure and ultra-high pressurewaterjet technology, manufactures afull line of quality waterjetting systemsand accessories for contractor andindustrial uses. These include surface

ANew Multi-Gun Valve Designed For Higher Flow

Mark Your Calendar

2007 AmericanWJTA Conference

and ExpoAugust 18-22, 2007

Marriott HoustonWestchase HotelHouston, Texas

preparation, paint removal, tank andtube cleaning, concretehydrodemolition, concrete and pipecutting, and more. For more informa-tion, visit www.nlbusa.com or contactJim Van Dam by phone: (248) 624-5555 or e-mail:[email protected].


w w w . n l b c o r p . c o m

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From immediate equipment needs to simple questions, help is only a click away. NLB is the source for:

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• 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.

29830 Beck Road, Wixom, MI 48393MI: (248) 624-5555, TX: (281) 471-7761NJ: (856) 423-2211, LA: (225) 622-1666CA: (562) 490-3277e-mail: [email protected]

Option 2: Hydro-excavation Method

Open hole with sloped sides to allow for legal hand diggingfor exposure of utility.

These tables illustrate the time, labor and cost savingsbetween the different methods. The Option 1 crew willlikely be occupied onsite almost all day, while Option 2’screw has time for multiple jobs in one day. This may ormay not be a typical example in your area.

Cost/benefit analysis worksheets used with permission ofwww.safeshovel.com.

Today’s Technology

The most effective hydro-excavators today are dedicatedunits designed and built specifically for hydroexcavation.They combine high-pressure water systems that cutthrough and break up sod and soil with a highflow airvacuum that lifts soil and small rocks out of the excavationarea.

In the late 1990s, Vactor® Manufacturing saw thatcustomers needed a dedicated machine, resulting in theVactor HXX Hydro-Excavator introduced in 1999.

Fan System or Positive Displacement (PD) System

On most dedicated hydro-excavators available today,customers may choose either a fan system or a positivedisplacement (PD) blower as the vacuum source. Each hasdistinct advantages:

• A fan system moves an incredible amount of air,excavating more rapidly than other systems. It’s also

easier to operate and maintain, and the unit’s overallweight is usually less. Also, fan units are generally lessexpensive than the PD versions.

• A PD blower moves air over long distances, allowingfor excavation at greater depths, but at slower speeds,than fan units.

Typical hydro-excavation jobs do not require digging togreat depths or at long distances, so the fan type is moreproductive for the majority of hydro-excavationapplications.

In either the fan or PD configuration, a simplified airflowpath design will maximize pickup and filtrationeffectiveness. Additional features that improve the unit’soverall productivity include extendable or telescopic boomsoffering a wide range of rotation and mounted on the curbside, large-capacity water tanks and debris bodies, heavy-duty solid construction, heated pump and hose reel cabinets,convenient operator controls andtool storage.




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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

ichel, Inc. has introduced the DARDI waterjet systems, available inthree standard table sizes. The DARDI waterjets are complete abrasive

systems. They come with the full support of the RICHEL team includingsoftware and technical support, spare parts, installation, and training. For moreinformation, contact Julie Kaiser or Ben Gerhardt, RICHEL, Inc., phone: 330-677-9100, fax: 330-677-9121, website: www.richel.com, email:[email protected].

Lindsay Gorrill, former president and CEO of WGI Heavy Minerals, andMelanie Delfakis, former direct sales for WGI Heavy Minerals and UniversalMinerals, have partnered together to create Precision Industrial Supply,LLC. Precision Industrial Supply delivers quality garnet products and service tothe abrasive waterjet industry. Precision’s Durajet Garnet is a premium washedgarnet produced specifically for the waterjet cutting market, and it isstrategically located across the U.S. and also available through a network ofdistributors. For more information, call 208-762-3536 or visitwww.precisionindustrialsupply.com.

he WJTA Safety Committee hereby solicitscomments regarding improvements to the

publication, Recommended Practices for theUse of Manually Operated High PressureWaterjetting Equipment. While RecommendedPractices is reviewed periodically at thebiennial conferences of the WaterJetTechnology Association, your comments and

Safety Committee Solicits Comments On Improvements ToRecommended Practices

New Products, Services

R

T suggestions for improving the publication areinvited and welcome anytime.

Please address your comments andsuggestions to: Safety Committee, c/o WJTA,906 Olive Street, Suite 1200, St. Louis, MO63101-1434, phone: (314)241-1445, fax:(314)241-1449, email: [email protected], website: www.wjta.org.


working surface for the Aqua CutterHydrodemolition units, the deck andgantry allow easy access to thedeteriorated concrete and rebar alongthe bridge. It also provides protectionfrom the traffic – in a ‘live’ applicationhaving minimal effect on the trafficflow – and a base for the treatedconcrete to fall safely.

The Loithal Bridge is 286 m longand features six sets of columns, thehighest with a bridge height of 33 m.With the balustrade safety barrierremoved, Hochdruck is clearing up to9 cm depth along the top of the 1.10 mparapet beam, between 17-20 cmfrom the bottom of the 70 cm deepbeam and up to 8 cm on its facingedge.

Due to the extremely short contract,Hochdruck is working two 12-hourshifts for 10 days, breaking for a longweekend break before starting thenext 10-day session. Working a three-day cycle, the robots are used toremove the deteriorated concrete from20 m of the facing edge of the beamover the first 12-hour shift. The AquaCutters are then returned to the startof the 20 m section to work the topedge of the beam in the second shift.This, according to Dirk Simon, is amajor feature of the tracked robotsfrom Aquajet Systems, compared withcompetitive wheel-mounted units.

“Being a tracked unit means theAqua Cutters can move backward andforward along the beam plus the robotis able to turn 360º on the same spot,”he said, adding, “Within the confinedworking width of the enclosed hard-shoulder area means turning with awheeled-unit would be impossible,”said Mr. Simon.

On the second day, the AquaCutters are used to remove the 17-20cm of concrete on the underneath ofthe beam along the same 20 msection. For the third day, the basearea of the surface preparation deck iscleared of fallen concrete debris andthe gantry moved over the next shift;

in readiness for the next 20 m, three-day cycle.

According to Site Supervisor BerndKlyne, each of the Aqua Cutters isremoving up to 4 m3/day. He is, hesays, “Very pleased with thisperformance, which is totally removingthe concrete belowthe rebar withoutcausing anydamage ormisplacement ofthe rebar.”

Providing waterpower for the tworobots, Hochdruckis using two highpressure pumpseach powered byCaterpillar C15diesel engines ratedat 440 kW, toprovide up to 250 l/min at 1000 bar foreach unit.

With the rebarexposed, the maincontractor is ableto identify andreplace largequantities of thecorroded rebar.

“The robots fromAquajet are by farthe best machinefor this job,” says

Twin Aquajet Robots Solve Corrosion Problems On German Bridge, from page 8


With over 200 litres a minute delivered at 1000bar of pressure, the robot removes the corrodedconcrete to expose the rebar without anydamage, leaving a ‘craggy’ surface for asuperior bonding with the new concrete.

Dirk Simon, adding, “It can operate onthe underbeam operations as easily asthe top face cleaning and with the 6 mstandard tower it can performvertically and overhead with the sameefficiency.”

For its next job, one of the AquaCutters will be moving closer toHochdruck’s base in Frankfurt for abridge project on the A66.

Although removing a similar amountof concrete as the Loithal Bridgeproject, “It will,” he says, “be easierwith not such a critical ‘tight’schedule.”

For further information, contact:Stefan Hilmersson, Aquajet SystemsAB, Brunnsvägen 15, SE-570 15Holsbybrunn, Sweden,Tel: int +46(0)383 508 01, Fax: int +46 (0)383 50730, email: [email protected].

Water flow and pressure

There are several benefits to usingwater (vs. air) as a nondestructiveexcavation tool.

Water flow andpressure

• Acts as its ownlubricant

• Controls staticelectricity

• Avoids thesandblasting effectof air

• Works in almost allsoil conditions

Low Water Usage


• Can be heated to excavate frozenground

Vactor recommends in most casesusing three to nine gallons per minute

(gpm) of water volume for hydro-excavation. Contractors are paid toexcavate the soil, not to dump debris,recover water or get more water.

Frozen-Ground Excavation



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WJTA Welcomes New Members

Corporate

Individual

Nancy LausengJet Edge12070 43rd Street N.E.St. Michael, MN 55376Telephone: (763)497-8726Fax: (763)497-8701

Esther LinHoong Yeu Precision Technology, Inc.No. 162 Sect. 4 Chung Hwa Rd.Hsinchu 300Taiwan, Republic of ChinaTelephone: [88](63)538-5161Fax: [88](63)538-9996

Jared PotterPotter Drilling LLC1665 Industrial RoadSan Carlos, CA 94070Telephone: (650)620-9232Fax: (650)620-9237

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Ed SmithHartman Walsh Corporation7144 N. Market StreetSt. Louis, MO 63133Telephone: (314)863-1800Fax: (314)863-6964

Wayne WiskMK HydroblastingPO Box 1573White Court, AB T7S 1P4CanadaTelephone: (780)778-6985

James Zohar5 Bruce StreetDartmouth, NS B2W 1L3CanadaTelephone: (902)434-4117Fax: (902)462-1834

The Jet News is published by the WaterJet Technology Associa-tion (WJTA) and is a benefit of membership in the Association.

©2006 Jet News. All rights reserved. Reproduction in any formforbidden without express permission.


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KMT ReceivesSubstantial OrderFor High PressureInjection Pumps

MT Waterjet Systems hasreceived a significant order

for high pressure pumps for the newHuntsman Polyethylene plant inEngland.

KMT Waterjet Systems hassigned a contract with SembCorpSimon-Carves to deliver KMTMcCartney injection pumps to anew plant for production of plasticsin Teesside, England. The plant,which is being built by Huntsman,one of the leading global chemicalproducers, is set to start productionin the fourth quarter of 2007. Theunit will be the world’s largest singleline Low Density Polyethylene(LDPE) plant.

KMT’s high pressure injectionpumps provide the process stabilityand high reliability required for thenew plant. The unit will produce400,000 tons of low densitypolyethylene annually through asingle line tubular reactor under thelicense of ExxonMobil.

“Injecting initiator solvent atreactor pressure is process criticaland KMT is pleased to provide thepump equipment and knowledge thathas been gathered during more than50 years of high pressureengineering expertise. KMTMcCartney is the origin to KMTWaterjet Systems and is today aseparate profit center within KMTWaterjet Systems,” says LarsBergström, CEO of KMT.

The new plant is beingconstructed by SembCorp Simon-Carves, one of the world’s mostexperienced process engineeringcontractors for the design andsupply of LDPE plants.

K


Therefore, using the proper watervolume is cost-effective and savestime. In addition, the resulting debrishas minimal water content, not a slurryas with systems using high watervolumes, which often allows debris tobe put back into the excavation.

Vactor recommends using waterpressures between 1,500 and 2,000psi. Pressure higher than 2,500 psi isunsafe. Operating a hydro-excavatorat the proper water pressure virtuallyeliminates the chance of damaging linecovers or casings.

Industry outlook

Many facilities and areas in Canadahave experienced intolerance to utilitystrikes and, as a result, they now relyheavily on hydro-excavation. The U.S.still has somewhat of a tolerance forhits as a “cost of doing business,”although that’s changing.

Enhanced enforcement from agovernment level may drivecontractors increasingly towardvacuum and hydroexcavation incoming years. While legislation hasbeen enacted in a few cities and statesacross the U.S., those examples arelimited. However, many people in theindustry say it’s just a matter of time.

The vacuum excavation market willhave to deal with plenty of unknownsin the near future – a recovery ofdirectional drilling, the possibility of afiber resurgence, and furtherlegislation to prevent “hits” andenforce existing one-call regulations.

Conclusion

At the time of this publication, itlooks like hydro-excavation willcontinue to grow in acceptance andpopularity for the foreseeable future.Contractors are increasingly finding

value in hydro-excavation forthemselves and their customers. Moremunicipalities are gaining confidencein the practice as new projects arecompleted.

Hydro-excavation can virtuallyeliminate the unknown or unintendedconsequences from any projectinvolving drilling, trenching orexcavation. Whatever the future holds,


hydro-excavation is here to stay andgaining ground.

Photographs courtesy of Vactor Manufacturing,Inc.

Article reprinted by permission from the Hydro-Excavation White Paper published by VactorManufacturing, Inc., 1621 S. Illinois St., Streator, IL61364, phone: 815-672-3171, toll-free: 800-627-3171, fax: 815-672-2779, email: [email protected],web: www.vactor.com. Vactor Manufacturing is adivision of Federal Signal Corporation.


Impressive progress and a fast-growing understanding of the diversified applications of waterjet technology are generating a growing excitement in theindustry. New techniques and applications are being developed and current ones are being improved. Waterjet technology, now being used in nearly alltypes of industry — manufacturing, mining, construction, concrete, stone, aerospace, engineering, process, and medical industries — continues toexpand at a rapid pace.

The 2007 American WJTA Conference And Expo will focus, from a practical and scientific viewpoint, on the most up-to-date advances inwaterjetting equipment, techniques, and applications. The areas to be addressed include, but are not limited to:

Commercial and academic authors are encouraged to submit titles and abstracts for consideration. To submit an abstract(s), please complete theabstract submission form on the back of this sheet, attach a copy of your abstract(s), and forward to the attention of the Conference Coordinator at theWaterJet Technology Association. The deadline date for submission of abstracts is December 29, 2006.

An Abstract Review Committee consisting of five referees will review the abstracts. Authors will be advised by February 28, 2007, regarding thedecision of the Abstract Review Committee.

The 2007 American WJTA Conference And Expo is organized by the WaterJet Technology Association. The WaterJet Technology Associationlooks forward to providing this forum and to your involvement and participation.

Authors - Please Note

● Papers must be original. Papers must not have been published elsewhere or be pendingpublication.

● Publication Fee. A nonrefundable publication fee (equal to the price of a member FullConference registration) is required. This publication fee will be waived if at leastone author registers (Full or Combo) for the WJTA Conference. (Authors must pay theapplicable member or nonmember price.) Also, one registration is good for multiple papers.The deadline date for receipt of your final paper will be April 20, 2007. The publication fee orpayment for a Full or Combo registration is due no later than June 1, 2007. Your paper willNOT be included in the Proceedings if the publication fee or registration fee is not paid by thisdate.

● Papers and presentations must be in English. Papers should be no longer than 15 printedpages. A “Paper Guide” containing directions for submitting papers will be forwarded to youafter your abstract is accepted. Papers that do not follow the “Guide” will be returned to theauthor(s) for correction(s) or charged a fee for revisions made by the WaterJet Technology Association office.

● Papers should be free of commercialism.

● Papers should be submitted as a Word file and a PDF file. If an author cannot produce a PDF file, a fee may be charged to convert a Wordfile to a PDF file if the Word file requires significant reworking (e.g., page breaks, pictures moving).

2007 American WJTA Conference And ExpoAugust 18-22, 2007

Marriott Houston Westchase Hotel ● Houston, Texas, USA

Announcement and Call for Papers

● Abrasives, Water, and the Environment

● Advanced Industrial Applications

● Advances In High Pressure Technology

● Automotive and Aerospace Applications

● Cleaning and Coating Removal

● Components and Systems

● Construction and Non-Manufacturing Applications

● Contractor Applications and Processes

● Demilitarization, including Removal of Land Mines (Demining)

● Drilling Applications

● Excavation, Tunneling, and Mining Applications● High Pressure Equipment and Systems● Hydrodemolition● Jet Mechanics● Jet-Material Interaction● Manufacturing Processes● Market and Future Needs● Novel Jets and Applications● Process Modeling and Control Studies● Rock Cutting● Safety, Training, and Environmental Protection

2007 WJTA Conference Committee

Pat DeBuskCo-ChairmanDeBusk Industrial Services Company

Bill McClisterCo-ChairmanOnyx Industrial Services

Craig AndresonParker Polyflex

Mohamed Hashish, Ph.D.Flow International Corporation

2007 American WJTA Conference And ExpoAugust 18*-22, 2007 l Marriott Houston Westchase Hotel l Houston, Texas

Abstract Submission FormFor each paper to be submitted for consideration, please complete this form, attach a copy of the abstract, and mail or fax to WJTA byDecember 29, 2006. Authors will be advised by February 28, 2007, regarding the decision of the Abstract Review Committee. Please mail orfax this form even if you email your abstract.

Paper Information

Paper Title _________________________________________________________________________________________

Authors ____________________________________________________________________________________________

Contact Person(Please print or type)

Name _____________________________________________________________________________________________

Position/Title _______________________________________________________________________________________

Company/Organization ______________________________________________________________________________

Street Address _____________________________________________________________________________________

City, Province ________________________________________ State _______________________________________

Country _____________________________________________ Zip/Postal Code ______________________________

Business Telephone __________________________________ Fax _________________________________________

Email _______________________________________________ Web site _____________________________________

Signature__________________________________________________________ Date ___________________________

Please check the category that best describes the topic of your paper. q Applications q Research q Contractor

Key words (Check the boxes under the different categories that apply to your paper):

*August 18 is reserved for the short course(s).

Mail completed form and abstract, NO LATER THAN DECEMBER 29, 2006, to: Conference Coordinator, 2007 WJTA American Waterjet Conference, WaterJetTechnology Association, 906 Olive Street, Suite 1200, St. Louis, MO 63101-1434, USA, telephone: (314)241-1445, fax: (314)241-1449,email: [email protected], web site: www.wjta.org

Jetsq Waterjetq Abrasive-waterjetq Abrasive suspension jetq Pulsedq Cavitationq Polymer Jetsq Other _____________

Environmentq Field workq Factory workq Submergedq Nuclearq Demilitarizationq Offshoreq Other _____________

Materialq Metalq Rockq Glassq Ceramicq Compositeq Concreteq Other _____________

Type of Studyq Modeling (theoretical)q Experimental studyq Hardware developmentq Contractor case studyq Manufacturing case studyq Software developmentq Economic analysisq Legalq Other _____________

Related Industryq Genericq Shipyardq Miningq Constructionq Aerospace/Aircraftq Automotiveq Oil/Gas/Refineryq Quarryingq Other _____________

Processq Cuttingq Drillingq Surface preparationq Cleaningq Strippingq Safetyq Millingq Jet-assistedq Other _____________

(First Name) (Surname/Family Name)

(First Name) (Surname/Family Name)

Safely delivering water at elevated pressures for cutting and cleaning applications demands reliable operation from your valves, fittings and tubing. It demands Performance Under Pressure.For over 50 years, HiP has been focused on producing a complete line of the highest quality valves specifically designed for just such waterjet applications.

We’re committed to providing our customers with the consistent quality and responsive service that helped us earn ISO9001 certification. We stock an extensive inventory of valves and accessories, allowing us to offer same day shipping of many products. For special orders, including custom manifolds, we have short lead times and experienced engineering assistance.

Before you spec high pressure valves, fittings or tubing, check out the company that Performs Under Pressure… HiP.

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Count on our proven valves, fittings & tubing for your waterjet cutting & blasting system

HiP…Our Name is High PressureTo find out more, come see us online at

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