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  1. foxymophandlpapa

    ASME Section VIII Div. 1 Vessel Stamp

    This is a question regarding the specified MAEWP on the vessel's stamp. We would prefer that our vessel's MAEWP says "FV" but the tank vendor refuses, saying code requires them to put an actual number. Currently, they are showing "15 psi". First, I find "psi" as a very gray area, especially...
  2. foxymophandlpapa

    Old ASME vessel, new PSV

    I have a vessel with a MAWP of 15 psig, stamped as an ASME vessel back in 1973. We're relocating this vessel and a new PSV needs to be provided. Current ASME Section VIII Div. 1 states that to be a pressure vessel the rating must exceed 15 psig. How should I approach this relief...
  3. foxymophandlpapa

    API 521: Tw (vessel wall temperature)

    I'm using equation 5 in API 521 to calculate the relief orifice size of a gas filled vessel. The explanation for the Tw value isn't very specific. Am I supposed to use the maximum wall temperature? Otherwise it would seem that Tw would just be equal to Tn, the normal operating gas...
  4. foxymophandlpapa

    Enlarger before PSV?

    ASME states that you should not use an enlarger before a PSV on a vessel. Can someone give me an explanation to why this is?
  5. foxymophandlpapa

    Glycol coil

    How are tank coils usually configured inside large storage tanks? I need to calculate the volume for thermal expansion of a tank coil in a 30000 gal monomer tank, but the coil will not be constructed until its on-site.
  6. foxymophandlpapa

    Thermal Relief

    When calculating thermal relief PSV's do you typically include fire as a scenerio? I would think a fire would count as two failures since the first failure would be blocking in the liquid. But fire has such a higher heat input, than say solar, I think it would still be considered.

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