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In 1956, Carl Johnson of Durox International in Luxembourg developed a method for cutting plastic shapes using a thin stream high-pressure water jet, but those materials, like paper, were soft materials. [4] In 1958, Billie Schwacha of North American Aviation developed a system using ultra-high-pressure liquid to cut hard materials. [5]
Ultra high pressure water jet cutters are used to cut a wide variety of materials including granite, concrete (see hydrodemolition), ceramics, fabric and even Kevlar. [15] One such cutter delivers 55,000 psi (380 MPa) through a nozzle 0.003 inches (76 μm) in diameter at 1 kilometre per second, which can cut a person at a close range.
Robotic Hydrodemolition in Folkestone, UK. Hydrodemolition of concrete exposing the rebar.. Hydrodemolition (also known as hydro demolition, hydroblasting, hydro blasting, hydromilling, waterblasting, and waterjetting) is a concrete removal technique which utilizes high-pressure water, often containing an abrasive material, to remove deteriorated and sound concrete as well as asphalt and grout.
A similar technology is the high pressure hybrid water-abrasive-ice jet treatment. Such technology is based on a high- pressure abrasive-water jet with addition of dry-ice pellets CO 2. Borkowski et al. [Bor03] show that effectiveness of surface treatment with the hybrid jet depends on the quality of ice particles.
OMAX was established in 1993 by Dr. John Cheung and Dr. John Olsen. They made high-pressure abrasive jet machining (a machining and fabrication process using a mixture of strong abrasives and liquid propelled by a high velocity gas) to erode material to form intricate shapes or specific edge shapes. [3] [4] [5]
The methods used for dismantling and clearing structures underwater include hydraulic cutting, oxy-arc cutting, oxyacetylene cutting, Jackhammers, hydraulic breakers, explosives, non-explosive demolition agents (expanding grout), submersible diamond wire saws and ultra high pressure water jetting. [14] [15]
Black Harris staffers have accused the campaign of "outright racial discrimination" and mistreatment, according to an article by the New York Times.
Water jet may refer to: A jet of water under pressure, like in an ornamental fountain or drain cleaner; Pump-jet, a marine propulsion mechanism for jetskis and other types of boats; Water jet cutter, a tool for cutting and the machining of engineering materials; Water-jet printer, a printer that makes use of water instead of ink
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