avg hardness on p5a base metal

[zombieweld]

on a mainsteam line of P5A material "as found" it had a Brinell Hardness AVG of 140 and 134 is this right? only 67,000 and 65,000 psi? welding with 9018 B3. wall thickness of 4.2". Can not do a temper bead process due to joint design. I want to use a SMAW process with PWHT 1350 F +or- 25 F. 2:45 hold. would this be ok? MAWP is 4050psi @ 1005 F

 

[metengr]

on a mainsteam line of P5A material "as found" it had a Brinell Hardness AVG of 140 and 134 is this right?

Since this is probably Grade 22, yes, it is in the ballpark for hardness of annealed material, based on my review of a CCT diagram for this material.

You should be following ASME B31.1 piping code for preheat, postweld heat treatment and inspection requirements for welding to this steam line. What exactly are you doing?