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  1. grosenbalm

    Hydrotest Pressure Exceeded

    Back to the question at hand: unclesyd, How do you know it will take 7100 psig to start permanent deformation? Is there a specified %SMYS not to be exceeded?
  2. grosenbalm

    Hydrotest Pressure Exceeded

    dcasto, The minimum yield strength for the flanges is 50,719 psi. The minimum yield strength for the pipe is 53,800 psi. Yield strength was not exceeded during the hydrotest, thus there was no plastic deformation. We believe the pipe and flanges to still be usable but wanted to confirm.
  3. grosenbalm

    Hydrotest Pressure Exceeded

    unclesyd, The pipe is 6" sch 120 A-106 GR B Flanges are 6" RTJWN 900# sch 120 A-105 There was leaking between flanges during the hydrotest, which was abruptly stopped after this was noticed.
  4. grosenbalm

    Hydrotest Pressure Exceeded

    For a 2220# piping system, the hydrotest pressure (3330# - 1.5 x MAWP) was exceeded. The piping system (pipe, flanges, gasket, and bolts) were hydrotested at 6500#. Since this is a test for leaks only and not a test for integrity, i.e. x-ray, are the pipe and flanges still usable or do they...
  5. grosenbalm

    MAWP for NPT fittings

    Does anybody have the write up from 16.9 on proof testing of components in piping systems? I don't have or know anybody with a copy. Thank you.
  6. grosenbalm

    MAWP for NPT fittings

    O.K., I am putting together a formal report on the subject: So, how would you explain the process of determining the maximum allowable working pressure of something (pipes, fittings, flanges, valves, etc.)? What process do manufacturers go through to determine an exact number for its product's...
  7. grosenbalm

    MAWP for NPT fittings

    So, is the only way to find out the MAWP of a pipe fitting to test it under pressure until it fails? Do all manufacturers do this and is it made public? Is there another way to predict the outcome mathematically?
  8. grosenbalm

    MAWP for NPT fittings

    From my knowledge, a 10,000# rated fitting is rated for its ability to withstand the pressure equivalent of a 10,000# rated pipe. I have been wondering myself if the MAWP is limited by the yield of the thread. I'm still looking for the answer. I know I saw something that calcualted the shear...
  9. grosenbalm

    MAWP for NPT fittings

    O.K. well I have B31.3-2000 now. What do you know about the pressure and wall thickness formulas from Chapter IX K304.1?
  10. grosenbalm

    MAWP for NPT fittings

    Well I'm getting the equations and the tables from a Technical bulletin (No. 128) and it back references B31.1, B16.11, and B31.3. It's kind of old (1981) so I don't know if some information has changed or not. I guess what I'm really getting at is, for high pressure piping, how do you solve...
  11. grosenbalm

    MAWP for NPT fittings

    I have been trying to put this all together for a little while now and I could use you guys' help to get through this. I am trying to figure out how to calculate the maximum allowable working pressure for NPT threaded fittings. I know the formula P=2St/(D-2yt) can give you the pressure but I...

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