I have been looking at the NACE MR0175 / ISO 15156-1 standard and trying to determine the discharge material requirement for a sour gas compressor skid at 5000psig, with up to 10 mol% H2S present. The standard is very detailed in it's description of allowable carbon steel and stainless steel material compositions and requirements, but it does not state when each should be used. I know the norm is SS for acid gas systems, but I don't know what makes it "acid" or why SS is typically used over CS. Does anyone have any guidelines? Am I looking at the wrong standard?
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