Question: is pwht required for sour service?
Answer: PWHT of Piping components in Sour service. Greetings, I want to get clarified on PWHT requirement for seamlesss carbon steel piping [not equipment] to avoid Sulfide Stress Cracking [SSC] in refinery sour service. As per NACE SP 0472 & NACE MR 0103, PWHT is not mandatory requirement for carbon steel to avoid SCC.