PWHT of P1 Materials
PWHT of P1 Materials
(OP)
Hey guys,
I have a job that has Trunnion welded to an 18" x 1.75" wall thickness 106C Pipe. The trunnion is 8" sch 80 (1/2" thick) and is attached with a 1/4" fillet.
I am hoping that this falls into the non-mandatory PWHT category of Table 132 (a).1. from B31.1 as the nominal thickness of the weld is 1/4" throat. I have attached a sketch showing the detail
Am I correct?
Thanks
I have a job that has Trunnion welded to an 18" x 1.75" wall thickness 106C Pipe. The trunnion is 8" sch 80 (1/2" thick) and is attached with a 1/4" fillet.
I am hoping that this falls into the non-mandatory PWHT category of Table 132 (a).1. from B31.1 as the nominal thickness of the weld is 1/4" throat. I have attached a sketch showing the detail
Am I correct?
Thanks





RE: PWHT of P1 Materials
And yes, you are below the PWHT region, BUT ensure that the welder uses a good preheat even for the tacks. 100 - 150°F should be plenty, and will reduce the residual weld stress. Also, make the weld in 2 passes and do not allow much oversize. Too much throat = mandatory PWHT.
RE: PWHT of P1 Materials
I would love to hear other peoples interpretation of this.
Tahnsk
RE: PWHT of P1 Materials
132.4 Definition of Thickness Governing PWHT
132.4.1 The term nominal thickness as used in
Table 132 and Notes is the lesser thickness of (A) or (B)
as follows:
(A) the thickness of the weld
(B) the thicker of the materials being joined at the
weld
Self explanatory.
RE: PWHT of P1 Materials
So my original thinking is correct?
RE: PWHT of P1 Materials