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  1. jt1234

    Div. 1, UG-37, Correction factor "F" not making sense

    Dear experts who specialize in nozzle reinforcement: Div. 1 UG-37, Correction factor “F” and Figure UG-37, if code insists it must be 1.0 for re-pad at theta =90 degree, which is the circumferential plane with the longitudinal stress of PR/2t , then “F” shall be 2.0 for re-pad at theta =0, which...
  2. jt1234

    Reducing flange analysis using FEA or Div 1

    Dear all, I have a Div. 1 vessel with top 36" nozzle, 600# B16.47 series A, connected to a forging flange with hub ( we call it reducing flange) and a 18" outlet pipe as shown. Can this reducing flange be classified as custom made component, not fitting UG-34, UG-39, Appendix 2 or Div 2 Part...
  3. jt1234

    Steam drum, Section I, how to stamp

    Dear all, A Korean vendor arguing that steam drum shall be stamped with "S-PART", as it is part of the boiler, shall not be stamp with "S". I think this coming down to the definition of "what is part ?". Steam drum, which can be either designed per Section VIII or Section I, in my opinion is a...
  4. jt1234

    Nozzle reinforcement for high temperature stainless steel vessel

    Dear all, I have a stainless steel (SS321) vessel with design temperature 1050F, not heavy wall, not cyclic service. In general, do you use re-pad for nozzles ? or use integrally reinforced nozzles due to high temperature ? (If for low alloy, we do use integrally reinforced, but not sure for...
  5. jt1234

    MDMT for a plant

    Dear all, We will build a new plant in northern USA. The project MDMT is -20F. However a question was raised that years ago there was an extreme cold temperature last about couple of weeks below -20F, says -40F. The question is, shall the MDMT be re-set to -40F just for that rarely extreme...
  6. jt1234

    How to verify the reinforcement and rigidity of large blind flange with nozzle

    Dear all, I have a low alloy 30"-600# ASME B16.47 manway blind with 8" nozzle welded to the blind. Note that the nozzle will have axial force and bending moment acting on the blind too. What is the method to include MAWP and external piping load to calculate the nozzle hub reinforcement to make...
  7. jt1234

    Allowable compressive stress for low alloy at high temperature

    Dear all, I believe this must have been discussed in the past. I have a 2 1/4Cr-1 Mo vertical vessel with full vacuum at 1100 F (593C). It is beyond the chart to find out allowable "B" value. Then what is the best approach to get the allowable compressive stress ? Thanks in advance for your help.
  8. jt1234

    Normalized w/Accelerated Cooling & Tempering (NACT) vs Normalize & Tempered (N&T)

    Dear all, Normally we put "N&T" as a common term and practice on vessel data sheet for low alloy material. Supplier is offering "Normalized w/Accelerated Cooling & Tempering (NACT)" heat treatment. I see it is acceptable. However, supplier's PQR is showing " N&T" material. Is it necessary to...

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