High pressure water blasting is the use of a focused and pressurized water stream propelled at high speeds to clean or prepare surfaces, and to remove material, debris, or deposits from an area or structure.
Steel Structures Painting Council (SSPC) has adopted the following four definitions for cleaning operations using water jetting technology:
- Low-pressure water cleaning (LP WC) is the use of water pressure less than 5,000 psi (34 MPa).
- High-pressure water cleaning (HP WC) is the use of water pressure between 5,000 to 10,000 psi (34 to 70 MPa).
- High-pressure water jetting (HP WJ) is the use of water pressure between 10,000 to 25,000 psi (70 to 170 MPa).
- Ultrahigh-pressure water jetting is the use of pressures above 25,000 (170 MPa).
Waterblasting is an accepted method of cleaning and surface preparation and has been in use for decades. It is used in several applications across a wide range of industries and may also be referred to as hydrocleaning, hydroblasting, waterjetting, high pressure cleaning, and hydrodemolition.
The most common applications are: