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ASME B31.3-2016 <br /> (16) Table 331.1.3 Exemptions to Mandatory Postweld Heat Treatment (Cont'd) <br /> P-No. and Group No. <br /> (BPV Code Section IX, Control Thickness, Additional Limitations Required for <br /> QW/QB-420) [Note(1)] mm (in.) [Note(2)] Type of Weld Exemption From PWHT[Notes (3)—(5)] <br /> P-No. 6, Group Nos. 1-3 All All Specified carbon content of the base <br /> materials 50.08% <br /> Nominal material thickness <br /> 510 mm (% in.) <br /> Weld filler metal is A-No. 8,A-No. 9, or <br /> F-No. 43 composition [Note (8)] <br /> P-No. 7, Group No. 1 All All Specified carbon content of the base <br /> materials 50.08% <br /> Nominal material thickness <br /> 510 mm (%in.) <br /> Weld filler metal is A-No. 8,A-No. 9, or <br /> F-No. 43 composition [Note (8)] <br /> P-No. 7, Group No. 2 ... ... No exemptions from PWHT <br /> P-No. 8, all Group Nos. All All PWHT neither required nor prohibited <br /> P-No. 9A, Group No. 1 All All Specified carbon content of the pipe <br /> material 50.15% <br /> Nominal material thickness <br /> 513 mm (112 in.) <br /> Mandatory preheat has been applied <br /> P-No. 913, Group No. 1 All All Nominal material thickness <br /> <-16 mm (5/8 in.) and the WPS has <br /> been qualified using a material of <br /> equal or greater thickness than used <br /> in the production weld <br /> P-No. 10H, Group No. 1 All All PWHT neither required nor prohibited <br /> P-No. 101, Group No. 1 All All PWHT neither required nor prohibited for <br /> nominal material thickness <br /> 513 mm (112 in.) <br /> P-No. 11A <-50 mm (2 in.) All ... <br /> P-No. 15E ... ... No exemptions from PWHT <br /> P-No. 62 ... ... No exemptions from PWHT <br /> NOTES: <br /> (1) If differences with the P-No. listed in Appendix A are found, the P-No. listed in ASME BPV Code Section IX, Table QW/QB-422 applies. <br /> (2) The control thickness is defined in para. 331.1.3. <br /> (3) The nominal material thickness is defined in para. 331.1.3(c). <br /> (4) No exemptions are permitted for PWHTs required by the designer or the WPS. <br /> (5) Additional exemptions for welds made in accordance with para. 328.7 may be taken for the materials addressed. <br /> (6) Single-layer or single-pass welds may be exempted from PWHT, provided the WPS has been qualified using single-pass welds with <br /> ±10% heat input and that all other conditions for exemption are met. <br /> (7) Non-load-carrying attachments are defined as items where no pressure loads or significant mechanical loads are transmitted through <br /> the attachment to the pipe or pressure-containing material. <br /> (8) The A-Nos. and the F-Nos. are found in ASME BPV Code Section IX,Tables QW-442 and QW-432, respectively. <br />