Water Jetting

We have robust methods of containing and filtering any of the waste water produced by the UHP water jetting process

UHP Water Jetting

Ultra high pressure water jetting is a method of surface preparation that uses water projected onto a surface at pressures between 25,000 and 36,000 psi.  No abrasives are used in the operation as water jetting relies on the energy of the water striking the surface to achieve the preparation standard.  

All coatings and surface contaminants have a removal threshold energy which is predominantly sheer rather than tensile. If the water jetting exceeds this threshold the coating and contaminants will be removed. When using UHP water jetting as a process of surface preparation, part of the energy kinetic used is transformed into heat. The heat raises the temperature of the substrate and accelerates the evaporation of the water and the drying of the surface. The metallic steel surface will quickly ginger as a result of surface oxidation, this is known as flash rusting.

An additional benefit of using UHP water jetting as a method of surface preparation is that any soluble salts and invisible surface contamination will be removed. Surface tolerant primers must be utilised after the UHP water jetting process in order to obtain the optimum adhesion strength between the primer and the steel surface.

We have robust methods of containing and filtering any of the waste water produced by the UHP water jetting process. This is increasingly important when removing existing coating systems containing lead. UHP water jetting has become increasingly popular as an alternative to dry abrasive blast cleaning due to the speed of coating removal and reduction in air borne contaminants.

SPG have the capabilities to use UHP water jetting as a method of surface preparation and have extensive experience in this specialist application.

Case Studies

Waalbrug Bridge, Nijmeg...

SPG collaborated with Dutch contractorFeijenoord to undertake the removal of a coating system containing hexavalent chromium using RPR Heat Induction....

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Irthlingborough Lock

Working in collaboration with JN Bentley, SPG successfully demonstrated the benefits of implementing a more efficient process of coating removal, surf...

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London Eye

SPG supported Red 7 Marine in the refurbishment of the London Eye substructure. The substructure of the London Eye is located in the Thames riverun...

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