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...
At present time, my company intent to distribute/utilized the steam which generate from Co-Gen Plant to several facilities.. The Steam pipelines app.length is 20 km.
Need your advise regarding the piping code should be applied/refered..
B31.4 ??? or
B31.8 ??? or
B31.1 ??? or
else ???