Welding on ASME B31.3 PWHT Component Requirements
Welding on ASME B31.3 PWHT Component Requirements
(OP)
We have a ASME U-Stamped vessel that has been PWHT. The Section VIII code boundary stops after the first nozzle weld. After that weld it is considered B31.3. After the nozzle to shell weld,(the Section VIII code boundary) there is a YALE closure welded to the end of the nozzle. This customer wants us to add an olet to this section pipe. It falls out side of the Section VIII code, so i was wondering what are the requirements for welding on ASME B31.3 pipe that has been PWHT. If it were within the code boundary, per the NBIC we would just preheat to 300 DEG F and maintain, however it is outside the code boundary. The thickness of the pipe is 1.125, P1 Materials. I would greatly appreciate any advice.
Thanks,
Thanks,





RE: Welding on ASME B31.3 PWHT Component Requirements
RE: Welding on ASME B31.3 PWHT Component Requirements
Is the preheat to 300F as the welding WPS, but not for PWHT? right?
RE: Welding on ASME B31.3 PWHT Component Requirements
Thanks,
RE: Welding on ASME B31.3 PWHT Component Requirements
RE: Welding on ASME B31.3 PWHT Component Requirements
RE: Welding on ASME B31.3 PWHT Component Requirements
I saw that as well but wasn't sure what a YALE closure was so presumed the Olet was intended to be inserted in a spool attached to the nozzle (therefore past the ASME VIII code boundary).
However, if a YALE closure is just a fancy end cap welded to the end of the nozzle then an Olet in the nozzle itself would fall within ASME VIII jurisdiction - as you have noted