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Recent content by Nfroh

  1. Nfroh

    External Design pressure or FV

    You do not need to stamp a pressure vessel if the internal/external design pressure is less than 15 psi (U-1(c)(2)), but it does not mean that you should not perform a design calculation. As soon as there is over/under pressure it’s MF responsibility to assure that the vessel is safe.
  2. Nfroh

    MAP

    I checked it and found that compress does not consider a hydro head neither for shell nor for head in the calculation for MAP. IMO the reason is not existing official Code definition of MAP. If you need it for the calculation of the hydro pressure UG-99(c) than the base is “calculated test...
  3. Nfroh

    Allowable stress for circumferential stress at horn of saddle

    It’circumferential bending stress, bending stress is limited by 1,5*Sallowable
  4. Nfroh

    Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

    You cannot use joint efficiency factor in an App.2 calculation, since there is no any mentioned. Of course if you want, you can reduce the allowable stress for the flange to be conservative, but you do not need to. If the flange is 3,25” thick made of ferritic steels you’ll need to perform 100%...
  5. Nfroh

    MAP and UG-99(c)

    Hi gr2vessels, I know that the calculation of UG-99(c) is optional and there is nothing wrong with this paragraph. In my opinion it is wrong to calculate UG-99(c) with 1,3*MAP. According to Code, the test pressure UG-99(c) shall be calculated using 1,3 * “basis for calculated test pressure as...
  6. Nfroh

    MAP and UG-99(c)

    Hi, Compress and as I know other PV computer programs use for the calculation of test pressure according to UG-99(c) the term MAP, which is in my opinion wrong. The Code tells that “basis for calculated test pressure as defined in 3-2” shall be used and not the MAP. App. 3-2 says that ”basis...
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