If the piping lines to be used for process,with welding defects as the owner,s decision due to some reasons,contrary to our recomendation(we are client,s consultants) with following conditions:
1- Specificatin type and grade of material:(A335 P11CL1,A691 1 1/4 Cr CL22) and P No.4.
2- The thickness :more than 13mm,require PWHT.
3- The service is high pressure steam(the pressure is more than 42 bar and the temprature is more than 370 centigrade).
4- The type of welding defects:LOF,LOP
Will you kindlly let us know:
1- How long will be the life expectancy of the A.M.welds?
2- If welding defects are repaired and radiography results are acceptable
before PWHT,is it possible to ignore the radiography after PWHT?
(although this is against the standard)
3- When the joints were repaired,PWHT was performed by contractor mistake,now is it necessary for the joints to be cut and rewelded and again PWHT performed?
Best Regards
O.khodabandeh