Dear All,
We are going to do P91 piping fabrication, as per client specification the stroage time after welding is limited to maximum 7 days for PWHT. Is there any problem if it delays 10 days when we are following preheating procedure for welding as mentioned below:
Preheat at 200 degree C. Min. 300 degree C. Max.
Inter pass temperature 250 to 300 degree C.
Cooling 20 to 80 degree C. after wleding
Post heating (extended heating) after cooling 300 degree C.
for four hours or 400 degree C. for three hours.
Thanks in advance for your response.\
Manoj.
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