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It is not likely that this will be allowed, especially if you have had any PWHT performed!

Thank you both for your insights, they were very helpful.

I have been reading through another post - HIC, SSC, SCC, HCL and HTHA - and I see Nelson Curves are mentioned. Do these apply to H2S? They seem to refer to the partial pressure of hydrogen instead of hydrogen sulfide. We do not have a copy of API 941 in-house, but may be able to porvide...

Thank you for the reply, that was at least a step in the right direction. Do you know the justification for those who choose to use carbon steel all round? Is it just water condensate that could cause a potential problem, or could these same problems arise if operating conditions place you...

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...