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  1. Tugboat1984

    With multiple MAWPs/MDMTs, where do I set my RV?

    I have a pressure vessel that has a U-1 form (as well as the nameplate) that has two different sets of MAWPs and MDMTs. One MAWP is 250 psi @ -20F to 300F and the other MAWP is 85 psi @ -20F to -50F. This vessel is operated on a 24/7 basis between -30F and -40F. The vessel contains anhydrous...
  2. Tugboat1984

    Can a Relief Valve Set Point be set higher than the MAWP (Dual Stamped)?

    I have a pressure vessel that has a U-1 form (as well as the nameplate) that has two different MAWPs and MDMTs. One MAWP is 250 psi @ 300F to -20F and the other MAWP is 85 psi @ -20 to -50F. We operate this vessel between -30F and -40F. The vessel contains anhydrous ammonia and is operated at...
  3. Tugboat1984

    Can a Relief Valve Set Point be set higher than the MAWP

    I have a pressure vessel that has a U-1 form (as well as the nameplate) that has two different MAWPs and MDMTs. One MAWP is 250 psi @ 300F and the other MAWP is 85 psi @ -50F. We operate this vessel between -30F and -40F. The vessel contains anhydrous ammonia and is operated at around 9"hg...

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