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November 19 - November 23, 2018

What is the best low-maintenance approach to coating power-tool-cleaned field weld joints on process pipework that is protected with thermal-sprayed aluminum?

Selected Answers

From Katheravan Arumugam of ENI on December 6, 2018:
I would suggest a suitable organic zinc rich with high loading of zinc as a low-cost maintenance approach for the field weld joints. A stripe coat should be followed by a full coat application

From Bryant Chandler of Greenman-Pedersen, Inc. on November 27, 2018:
Going to the expense of applying TSA to the pipe, then the field weld joints should have nothing less if you are looking for the low-maintenance approach. The power-tool-cleaned areas should be grit-blasted to SSPC-SP 5 with a 3+ mil profile, then field- apply the TSA. I would also specify a seal coat over the TSA for the field joints to provide extra protection. All things being equal, the field joints would be the first to show evidence of corrosion due to the slight dissimilar metallurgy (weld metal vs. base metal), so the added seal coat would be a plus at very little cost.

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Tagged categories: Power tool cleaning; Surface Preparation; Surface preparation

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