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Uses a high-velocity stream of ultra high-pressure water 30,000–90,000 psi (210–620 MPa) which is produced by a high-pressure pump with possible abrasive particles suspended in the stream. Is used for machining a large array of materials, including heat-sensitive, delicate, or very hard materials.
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.
Concrete chipping is a process which requires trained chippers or a robotically-controlled machine with an ultra high pressure water source (20,000 psi) to enter the drums of ready-mix concrete trucks and central mixers to break away the dried concrete along the drums’ walls.
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.
A pressure washer is used to remove old paint from a boat. Patio flagstones being pressure washed using a rotary nozzle. Pressure washing or power washing is the use of high-pressure water spray to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces.
High pressure removal uses water at 2,000–15,000 psi (14,000–103,000 kPa) at up to 30 US gallons per minute (1.9 L/s) while ultra high pressure removal uses up to 40,000 psi (280,000 kPa) with a water usage between 8 and 16 US gallons per minute (0.50 and 1.01 L/s) (Speidel, 2002, p. 4).
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Thick scale, thick paint, barnacles and similar marine growth make cutting difficult and should be removed first. An ordinary paint scrapper is useful in removing light scale and paint, but for heavier growths, a high-pressure water jet cleaning tool may be additionally used. If possible, both sides of the metal should be cleaned before cutting.
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