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CL BLOG Continued from page 51 pipe of the proper pressure rating and spray. I have seen this done. Clean the unit, replace the mixer, and then move on to the next coating. These plural systems can be used in many ways. Simplistically, they are two single airless pumps ganged up. There is no single tool that covers all situations, but if I could have only one spray pump, a plural-component unit would be it. media formulated in the United States that left a zero profle. Sponge-blasting also uses abrasives to produce an anchor pattern. The abrasives are encapsulated inside the sponge so that when the sponge strikes the surface, the abrasives are exposed and the blasting takes place. The sponge is used to absorb the dust produced during blasting. It is usually used in areas with sensitive equipment. A Glass beads are a good option if a profle of up to 15 µm is acceptable. You can try using dry ice blasting, a very clean method that can be operated at different blasting pressures. This is being used on new liquid petroleum gas tanker vessels in Germany. One problem is availability. Continued on page 55 A Plural pumps are widely used for many different coating applications, including aerospace and automotive fnishes, and are not by any means restricted to 100% solids or to rapid reacting systems. Their main advantages are in reducing waste and inconsistency of the product. You need to check with your coating supplier to get his recommendations; the only possible issue I can think of is a product that requires an induction time. Stainless steel surface cleaning Q We have been asked to clean the external surfaces of large-capacity drilling fuid tanks. I need a fast and effcient method to clean well-bonded drilling muds from the surface of stainless steel (SS) without profling. Do you know of a method of blast cleaning that provides a zero anchor pattern? What about sponge-blasting? Do you think that would work well? A Have you considered ultrahighpressure waterjetting? It cleans the surface without creating a profle. You can use acid cleaning, although that becomes a health, safety, and environmental issue. Calcium carbonate (CaCO3) (chalk) blasting, either as a slurry or dry, will clean without producing any profle whatsoever. A I used sponge-blasting on a SS housing on a platform that had ferrite impregnation from grinding. We bought equipment and had a special mix of sponge-blasting NACE International, Vol. 52, No. 5 May 2013 MATERIALS PERFORMANCE 53