Regarding PWHT THICKNESS

[SEN SEN]

Dear all,

         Pls I needs your all valuable comments regarding PWHT thickness,

As per ASME B31.3 2018 

,Table 331.1.1, whether PWHT based on thickness of base metal or P.No and Group No,

 I appreciate your guidance,

SENTHIL P

[Sagar SK]

Some basic understanding on code reading, In B31.3 they have simply mentioned about material thickness, P No and group no which is interlink with each other in one table and below is code statement. 

331 HEAT TREATMENT

331.1 General

331.1.1 Postweld Heat Treatment Requirements ð18Þ

(a) PWHT shall be in accordance with the material

groupings (P-Nos. and Group Nos.) and ranges in

Table 331.1.1 except as provided in Table 331.1.2 and

Table 331.1.3. See Appendix F, para. F331.1. The P Numbers

and Group Numbers are defined in ASME

BPVC, Section IX, Table QW/QB-422. (Note that the PNos.

are also listed in Appendix A.)

It means all factor shall be always taken in to consideration and not any particular. 

Check also about CEV for PWHT. 

Regards,