What material specification should be used for gas piplines with high partial pressure H2S (P(H2S) = 4 psig)? I am under the impression that MR0175 does not address HIC, SWC, and others and that I should spec conformance with ISO 15156-2. The pipe vendors respond that MR0175 is equivalent to ISO 15156-2. I'm confused. Should I require Full Body Normalized? Do I need to specify a max on manganese and sulfur content? Also, should I spec Gr B or is X-42 okay? I'm concerned that the actual yield of X-42 may be as much as X-60. Is there a problem with full body normalized ERW vs. seamless?
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