Published by the WaterJet Technology FEBRUARY 2007 Association for the benefit of its members 906 Olive Street, Suite 1200 l St. Louis, MO 63101-1434, USA l Telephone: (314)241-1445, Fax: (314)241-1449 An Introduction To Air-Mover Vacuum Trucks Figure 1. Anatomy of an air-mover ince an air-mover can vacuum delving into the technical information a On the inside Sliquids, dry materials, a mixture daunting task. of wet and dry materials, and sludge, Fan Jet Characteristics ................. pg. 4 This article is designed to provide a it is a very flexible piece of KMT Reorganizes ......................... pg. 5 comprehensive look at the equipment, equipment. As long as the material Nominations Open For WJTA available options and practical can flow through a six or eight inch Board of Directors .................... pg. 6 guidelines for air-mover operation and hose or tube and has a flash point Welcome New Members .............. pg. 10 maintenance. This is an overview and higher than 150 degrees, an air- Safety Of Waterjets For not a substitute for the more detailed Demilitarization ...................... pg. 12 mover can handle the job. and specific instructions provided by As more and more contractors, the manufacturer. To assure optimal Conference Information municipalities and utilities learn and safe air-mover operation, all Preliminary Schedule of Events .. pg. 12 about the performance advantages operators should be required to read Candidates Sought For and cost benefits of air-movers, they the equipment manual and to be 2007 WJTA Awards ................. pg. 13 are eager to evaluate this method of trained on the safe operation and 2007 American WJTA Conference vacuum excavation, but they find maintenance of the equipment. and Expo ................................. pg. 14 Seven Ways To Attend ................. pg. 19 (continued on page 2) Safety Committee Solicits An Introduction To Air-Mover Vacuum Trucks, from page 1 Comments On Improvements To Anatomy of An Air-Mover the center of the separator (see Figure 2). Recommended Practices An air-mover is referred to by a number of names such as a wet/dry he WJTA Safety Committee vacuum truck or even by the names of Thereby solicits comments major air-mover manufacturers such regarding improvements to the as Supersucker® manufactured by publication, Recommended Practices Super Products LLC or Federal for the Use of Manually Operated Signal’s Guzzler™. A typical air- High Pressure Waterjetting mover in today’s market has a high Equipment. While Recommended vacuum 27-28 inch dual lobe or tri- Practices is reviewed periodically at lobe high air flow (5000-6000 cfm) the biennial conferences of the vacuum pump. It also has a 16-18 WaterJet Technology Association, your cubic yard tank, cyclone separator and comments and suggestions for baghouse with filter bags. improving the publication are invited and welcome anytime. An air-mover uses a combination of vacuum and air flow to convey Please address your comments and material. It uses just enough vacuum suggestions to: Safety Committee, c/o to lift the material into the air flow Figure 2. WJTA, 906 Olive Street, Suite 1200, then let the air flow carry the material. St. Louis, MO 63101-1434, phone: To understand how to operate and (314)241-1445, fax: (314)241-1449, maintain an air-mover, it is essential to The air flow leaves the cyclone e-mail: [email protected], web site: learn about the air flow and filtration separator and goes to the third stage www.wjta.org. of the equipment. Most air movers of filtration, the baghouse. The have four (4) stages of filtration to baghouse normally contains acrylic remove material from the air flow. coated bags to handle wet or dry WJTA Administration Figure 1 (below and on page 1) shows material. The bags filter out material the air flow of a typical modern greater than one micron as air flows Chairman of the Board President/Jet News Editor through the bags. From the baghouse, John Wolgamott George A. Savanick, Ph.D. designed air-mover. (970)259-2869 (952)432-7594 the air flows through a final filter screen (stage 4) then through the Vice-President Treasurer Secretary Pat DeBusk Larry Loper (position open) vacuum pump and out the exhaust (281)842-8000 (800)289-7447 silencer. 2005-2007 Directors Lydia M. Frenzel, Ph.D. Hugh B. Miller, Ph.D. Performance Enhancing (512)392-2210 (520)621-4689 Options Mohamed Hashish, Ph.D. Carl Olsen Figure 1. (253)850-3500 (253)872-2300 To enhance air-mover performance, Bill McClister Forrest Shook (713)307-2142 (248)624-5555 there are a number of options Note the air flow going through the available to meet application-specific hose or tube into the debris tank needs. Emeritus Members where the air flow slows down Andrew F. Conn, Ph.D. Thomas J. Labus Hydraulic Boom (410)532-3452 (262)245-9702 allowing most of the material to drop into the tank. (stage 1) From the tank, Thomas J. Kim, Ph.D. Fun-Den Wang, Ph.D. This is an ideal tool for vacuuming (401)874-5991 (303)279-9415 the air flows into a cyclone separator material out of a trench or sewer, or (stage 2) where the air flow spins when it is necessary to reach over a allowing centrifugal force to separate wall or fence. It allows the user to Association Managers material from the air as the air exits Mark S. Birenbaum, Ph.D. l Kenneth C. Carroll (314)241-1445 (continued on page 7) Page 2 WJTA on the web: www.wjta.org February 2007 Fan Jet Characteristics himizu* recently published a material. The erosive S paper on the subject of structure intensity is fairly even and erosive characteristics of fan jets. when the jet operates Here are the highlights. immediately downstream of the liquid sheet and then gradually becomes uneven as the distance increases. The erosive power of a moving fan jet is also the highest immediately downstream of the liquid sheet. Shown in the picture is the topography of a damaged mild steel specimen by a moving fan jet at 300 MPa and 400 mm/min, with a standoff of 20 mm. * Shimizu, S. (2006) Structure and erosive Article reprinted with permission from the characteristics of water jet issuing from fan jet Quality Waterjet Newsletter, December 5, nozzle, in Peter Longman (Ed.), Proceedings 2006, published by QualJet LLC, of the 18th International Conference on Water www.qualjet.com. Jetting, Gdansk, Poland, September 2006, pp 337-345. Fan jets were produced with nozzles Jet Edge Releases New Precision like the one shown in the picture. This nozzle has a conical convergent inlet Waterjet Cutting Product Brochure section with a 84° convergent angle. ° The outlet face of the nozzle has a 52 et Edge, Inc., a leading precision cutting systems, which triangular notch. In the center is an Jmanufacturer of ultra-high include an expandable high-rail elliptic hole with major/minor pressure waterjet and abrasivejet gantry, a mid-rail gantry and an diameters of 0.43 mm/ 0.33mm (for a systems for precision cutting, abrasive machining center. The nominal diameter of 0.33 mm nozzle). coating removal and surface brochure also highlights Jet Edge’s preparation, recently released a new AquaVision Di motion controller and Instantaneous photographs of the brochure highlighting its precision precision cutting accessories that fan jets, with pressure varying from 70 waterjet cutting products. include cutting heads, abrasive to 300 MPa, were taken from two delivery, removal and recycling directions with an exposure time of 1.5 The new brochure features Jet systems, and a closed loop polisher. microseconds. The jet shown in the Edge’s ultra-high pressure intensifier picture was at pressure 300 MPa. It pumps which are rated for 60,000 To request a brochure, call 1-800- has a spreading angle of psi (4,100 bar), as well as its JET-EDGE (538-3343) or e-mail ° approximately 24 . Below a region of [email protected]. transparent liquid sheet is a region with streak structures of water droplets, where practical coating The Jet News is published by the WaterJet Technology Association removal takes place. (WJTA) and is a benefit of membership in the Association. A stationary fan jet produces a line ©2007 Jet News. All rights reserved. Reproduction in any form forbid- segment type of damage on the target den without express permission. Page 4 WJTA on the web: www.wjta.org February 2007 KMT Reorganizes ue to the recent acquisitions of RPT and H2O Jet, D as well as the new joint-venture KMT Spindle Technology, KMT introduces a new organization based on four business areas. In connection with the new organization, KMT also presents a new management structure. The new structure was effective January 1, 2007. KMT will be organized in four Business Areas as follows: KMT Waterjet, includes: - KMT Waterjet Systems, Baxter Springs, USA - KMT Aqua-Dyne, Houston, USA - KMT McCartney, Baxter Springs, USA - KMT H2O, Olympia, USA KMT Precision Grinding, includes: - KMT UVA, Bromma, Sweden - KMT Lidköping, Lidköping, Sweden - KMT NanoGrinder, Lidköping, Sweden - KMT LMV, Lidköping, Sweden - KMT Spindle Technology, Wafangdian, China KMT Robotic Systems, includes: - KMT RPT, Auburn Hills, USA - KMT Cutting Systems, Ronneby, Sweden KMT Sheet Metal Working, includes: - KMT Ursviken, Ursviken, Sweden - KMT Herber, Värnamo, Sweden In connection with this change, KMT introduces a new Group Management consisting of: Lars Bergström, Chief Executive Officer Joakim Roslund, Chief Financial Officer Per-Olof Jungqvist, Technical Director Duane Johnson, President Business Area KMT Waterjet Kevin McManus, President Business Area KMT Robotic Systems Johan Westberg, President Business Area KMT Precision Grinding Lars Bergström (CEO), President Business Area KMT Sheet Metal Working For more information, please contact Lars Bergström, CEO, Karolin Machine Tool AB, Telephone: +46 8 594 211 50 or e-mail: [email protected] Page 5 Nominations Open For WJTA Board Of Directors ominations for the WaterJet Technology Association N (WJTA) Board of Directors are now open.