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Posted by Arjun Sen "VNKTR", as an alternate states the use of "steel balls" as a blast media. Are we sure that this is an answer? Steel balls are round, and possess a smooth surface and are very expensive. Their use will require a costly recovery process to be set up at blasting site. Secondly, would this round & smooth steel balls generate the required profile on the steel substrate? Steel shots were used at one time as blast media but they required very heavy and high powered blasting operation to make the desired profile onto the substrate. They may still be in use, but rarely. I do not think that steel balls or even steel shots serve as the blast media in reinforcement bar or rebar blast cleaning operations. If we do accept that blasting the exterior surfaces of Penstock & Crosscountry pipes and accessories prior to application of FBE or even liquid coatings as the best answer, then what is the best blasting media for such an operation and what is the desired surface profile for FBE & liquid coatings? And secondly, are there any standards for blast media and surface profile requirements for FBE & liquid Pipe coatings in India? Best wishes, A. SEN.
on 8/30/2002, 8:06 pm
Using sand as a blasting media will always leave the danger of chloride & sulphate contamination of the blasted surface, all because of the source of sand. These retained contaminants would become detrimental to coating performance, may even cause early delamination of the coating from the substrate. This is not any personal feeling, but is a universally accepted reason for avoiding sand as a media for blast cleaning.
Consultant, Protective & Functional Coatings
Bombay, INDIA.
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