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Recent content by Don56

  1. Don56

    Difference Between API 5L / ASTM 53 / A106

    True SA-53 may be welded, but if also certified to SA-106 it must be seamless.
  2. Don56

    Difference between ASME and ASTM materials

    Be careful of the year of the ASTM Specification as Ed said. To use ASTM material, it must be acceptable to ASME. See ASME Section IIA Mandatory Appendix II for what years are acceptable. For example, if you purchase ASTM material that is newly wrought it may be certified to the 2019 or 2020...
  3. Don56

    normalizing or stress relieving

    What Code are you design/manufacturing to?
  4. Don56

    MMA50 corrosivity

    Thank you all.
  5. Don56

    MMA50 corrosivity

    Ed Google was of little help. 49 CFR 173.315 didn't help either.
  6. Don56

    MMA50 corrosivity

    I am not a chemist so I ask for your help. We have a customer asking for transport vessels to haul Monomethylamine 50% aqueous solution. Is it corrosive to steel (ASME/ASTM SA-517)? Is SA-240-304 or 316 a better or necessary option?
  7. Don56

    SA-455 Material

    I have used a lot of SA-455 making heads as well as SA-414G which is a similar sheet spec. I doubt you will find SA-455 at a steel warehouse. Most likely a mill buy.
  8. Don56

    Cold forming heat treatment requirement

    Being P11 material I assume this is QT material. If you hot form you will need to re-quench and temper the formed parts. Heating formed parts to the austenizing temperature will likely result in distortion.
  9. Don56

    Cold forming heat treatment requirement

    My bad. I missed that this is Div. 2.
  10. Don56

    Cold forming heat treatment requirement

    If this is a hemispherical head the FE=5.6%. If it is any other shaped head it is greater. Stress relieving is required for the fiber elongation per UG-79, UHT-79. PWHT is required per UHT-56.
  11. Don56

    UG-90(c)(1)(-l), UG-46

    Section VIII is for new construction, not in service inspections unles referenced by the NBIC, so UG-46 applies to new construction.
  12. Don56

    ASME VIII Div. 1 - Minimum distance between welds of pads

    To which Code are you inquiring? Nozzle size? Shell/head thickness?
  13. Don56

    Our supplier is fabricating a ASME

    Marty, Was it Q&T material? Was it hot formed? Was it re-Q&T'd after forming? Were mechanicals run on specimens heated with the part(s)?
  14. Don56

    Our supplier is fabricating a ASME

    There are very few head manufacturers that can make a head this size, this thick from a welded blank. Those that can will most likely need to do it hot (heating above the lower critical and tempering temperature). Welding and forming the round center section can be done as if forming any SE...
  15. Don56

    ASME Non Code Vessel repairs

    See the DOT requirements. 49 CFR 178.318 etc. https://www.ecfr.gov/cgi-bin/text-idx?SID=06dc33a334a4ca758900336bbdf92738&mc=true&tpl=/ecfrbrowse/Title49/49cfr178_main_02.tpl

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