NDT after Heat Treatment
NDT after Heat Treatment
(OP)
Dear All..
Since Heat Treatment (on HAZ) will affect metalurgical of base metals wich (at the end) caused welds imperfections.. So I do believe that NDT (radiographic) shall take place following Heat Treatment (PWHT)..
Could you give me the code/std which align with my thinking (NDT required after PWHT)... ??
FYI.. The pipeline was designed by B31.1 and constructed by API 1104..
I already read those code.. Unfortunately couldn't find it.. I think I miss it somewhere..
Since Heat Treatment (on HAZ) will affect metalurgical of base metals wich (at the end) caused welds imperfections.. So I do believe that NDT (radiographic) shall take place following Heat Treatment (PWHT)..
Could you give me the code/std which align with my thinking (NDT required after PWHT)... ??
FYI.. The pipeline was designed by B31.1 and constructed by API 1104..
I already read those code.. Unfortunately couldn't find it.. I think I miss it somewhere..





RE: NDT after Heat Treatment
The sequence of NDT either before or after PWHT is only identified in B31.3 for base materials P-3, P-4 and P-5A.
In B31.1, NDT can be performed either before or after PWHT to meet code NDT requirements.
RE: NDT after Heat Treatment
Quote from your thread "..The sequence of NDT either before or after PWHT is only identified in B31.3 for base materials P-3, P-4 and P-5A..." need rectified.
Not only for base materials P-2, P-4 & P-5A..Heat treatment requirement as per table 311.11 (B31.3)..
I wonder that the weld imperfections (as well as crack) will be initiated during PWHT.. Does it possible?? How to verify this possibility..???
RE: NDT after Heat Treatment