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  • Users: alsy
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  1. alsy

    Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

    Hello all, Can a reverse loose ring flange, that has metal to metal contact outside of bolt circle be designed per Appendix Y? We have a customer that has provided a design and calculations from App. Y and has asked us to review for compliance. I take App. Y to be for metal to metal regular...
  2. alsy

    B31.8 fabrication hydrotest to obtain max MAWP but limited to test pressure of 1.5x flange rating

    Hello All, We have a B31.8 600# class fabrication (operating at over 30% hoop stress) that we will be hydro pressure testing with a customer supplied test range of 2160 psig-2225 psig. The customer wants a MAWP rating of 1480 psig. I have stated that the MAWP can only be rated at the highest...
  3. alsy

    B31.8-BVPC postweld heat treat on thick blinds with weld joint less than 1.25" effective throat

    Subject: Is stress relieving (PWHT)on a B16.47 6.75" thick A-105 blind flange required when attaching a nozzle that has an effective throat less than 1.25"? This is a non lethal service- UW-2 does not apply. Construction code is B31.8 Reference section 825.2 Hello all. I am looking for some...
  4. alsy

    Using Yield/Tensile results from MTR's in piping/vessel stress design

    Hello All, I vaguely recall reading a document awhile back that stated in piping design one could use actual MTR yield results uo to 20% above the given specification for the material in question. I have since tried to locate this in the BVPC/B31.8/B31.3 to no avail. Assuming applicable...
  5. alsy

    Reinforcement pad on top of existing reinforcement pad, Construction code: B31.8

    Code: B31.8 Hello all, Although not typical, is there any provisions restricting the placement of a repad on top of an existing repad to come up with the required area per 831.4 and appendix F, and as long as the additional area needed is within the reinforcement zone, and applicable...
  6. alsy

    nozzle/opening in blind flange B31.8 vs BVPC

    Hello all. Please be easy on me since this is my first post on here :-) Subject particulars: Construction code: B31.8, Flange specification: B16.47 Subject matter: 42" blind flange,600#, that requires 2 openings. Opening A, d=3" and is located near the top of blind at 12.00 o'clock position...

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