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  1. KD007

    SA-193 Gr.B7M bolt material used in Wet H2S service is not passing requirement of UG44b clause.

    Hello TGS4, Yes you are right code case 2901-1 wont help. The vessel which I am designing is carbon steel vessel for which I guess typically we have used B7M bolting only. Can we use B8M (S.S) bolting in CS vessel with wet H2S service? Isnt there any other CS bolting grade with higher allowable...
  2. KD007

    SA-193 Gr.B7M bolt material used in Wet H2S service is not passing requirement of UG44b clause.

    Hello All, I have to design high pressure vessel as per Div 1 for wet H2S service in which bolt material requirement is to use 'M' grade material for bolt i.e SA-193 Gr.B7M. However when using UG44b for flange derating the B7M bolting is not fulfilling the requirement of having higher allowable...

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