Surface Preparation UHP Services can produce the desired surface, up to and including a "white metal" finish. It does so economically and at high production rates, without the environmental and health hazards of grit blasing. Surface Preperation Standards Water jetting is the use of standard jetting water high or ultra high pressure to prepare a surface for recoating and using pressures above 10,000 psi. Water jetting will not produce an etch or profile of the magnitude currently recognized by the surface preparation industry; rather, it exposes the original abrasive blasted surface profile. Standard jetting water is water of sufficient purity and quality that does not impose additional contaminants on the surface being cleaned and, of critical importance to water jetting operations, does not contain sediments or other impurities that are destructive to the proper functioning of the water jetting equipment being used. Low pressure water cleaning: Performed at pressures less than 5,000 psi. High pressure water cleaning: Performed at pressures from 5,000 to 10,000 psi. High pressure water jetting: Performed at pressures from 10,000 to 25,000 psi. Ultrahigh pressure water jetting: Performed at pressures above 25,000 psi. Surface Preparation Definitions WJ-1: Free of all previously existing rust coatings, mill scale, and foreign matter with a matte metal finish. WJ-2: Cleaned to matte finish with at least 95% of the surface are free of all previously existing visible residues and the remaining 55 containing only randomly dispersed stains of rust, coatings and foreign matter. WJ-3: Cleaned to a matte finish with at least two thirds of the surface free of all visible residues (except mill scale), and the remaining one third containing only randomly dispersed stains of previously existing rust, coatings and foreign matter. WJ-4: All loose rust, loose mill scale and loose coatings uniformly removed. Non-visual SC-1: Free of all detectable levels of contaminants (water-soluble chlorides, iron-soluble salts and sulfates) as determined using available field test equipment with sensitivity approximating laboratory test equipment. SC-2: Less than 7ug/cm2 chloride contaminants, less than 10ug/cm2 of soluble ferrous ion levels, and less than 17ug/cm2 of sulfate contaminants as verified by field or laboratory analysis using reliable, reproductive test equipment. SC-3: Less than 50ug/cm2 chloride and sulfate contaminants as verified by field or laboratory analysis using reliable, reproducible test equipment.

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