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  1. sziva

    ASME B31.1 Postweld Heat Treatment (PWHT)

    Now it is clear. The P-No and Group definition is described in ASME BPVC Section IX, section QW-420. Thanks a lot!
  2. sziva

    ASME B31.1 Postweld Heat Treatment (PWHT)

    Thanks Weldstan. The attachment clearly shows, that P91 is P No. 5B. Even if it would be 15E, as you stated. How does the grade number come into the picture in terms of PWHT?
  3. sziva

    ASME B31.1 Postweld Heat Treatment (PWHT)

    Hello All, I have some issues with the ASME B31.1 PWHT requirements. Issue: Table 132 contains the PWHT requirements based on material P-Nos (position) and Gr. Nos (grade). The P-No is clearly defined for each material in Mandatory Appendix A. For instance A335 P22 material's P-No. is 5A...

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