What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that...

Vendor: API
Product: API-577
Update on: Feb 8, 2026
Questions: 110

API API-577 Question Answer

What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that has been in caustic service for welding?

Neutralize and clean the surface within 6 in. (150 mm) of weld bevels

Steam out the piping system and dry

Verify with pH paper that any surface liquid is “basic"

Grind the surfaces near the bevel to remove contaminants

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