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January 17 - January 23, 2011

How should surface preparation be conducted in non-sparking atmospheres?

Selected Answers

From Lee Edelman of CW Technical Service on February 7, 2011:
     UHP { Ultra High Pressure Water Jetting } should be considered for a non-sparking atmosphere. UHP does not achieve a desired anchor profile for coating operations, so doing the proper testing and history on the surfaces in question is important. Most coated surfaces have been abrasive blasted after being fabricated in new construction, which gives these surfaces an anchor profile. Keep in mind if this is the scenario the proper coating selection should be specified to meet the enviroment of the surfaces and profile requirements

From Alberto Castilleja of Copromex on January 24, 2011:
Many abrasive productsin the market can be used as an alternative to dry sand blasting. They include plastic, walnut shell and corn cobs. Or you can wet-blast with silica sand or copper slag.

From Michael Kontodiakos of N/A on January 19, 2011:
Surface preparation should not involve any form of metal-to-metal contact, as abrasive blast methods utilizing steel abrasive onto a metal substrate would produce sparks. An alternative method would to use sanding disks, which are pneumatically propelled and or possible even using wet cleaning methods such as water-jetting.

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