SA387F11 casing
SA387F11 casing
(OP)
We are quoting building a boiler casing out of SA387F11 CrMo
1-1/4% Plate. Info that I have found says to preheat to 300F and HOLD THAT ELEVATED TEMPERATURE UNTIL PWHT.
Is that correct???? Please, someone, tell me how the heck that can be accomplished.
1-1/4% Plate. Info that I have found says to preheat to 300F and HOLD THAT ELEVATED TEMPERATURE UNTIL PWHT.
Is that correct???? Please, someone, tell me how the heck that can be accomplished.





RE: SA387F11 casing
RE: SA387F11 casing
This and a number of other queries scare the heck out of me but at least bryancobb asked the question; apparantly there may be no one in his company that he can effectively turn to for needed info to perform his assigned task - a pity.
bryancobb:
Assuming you are welding to ASME I or B31.1, you do not need to maintain preheat to onset of PWHT.
RE: SA387F11 casing
RE: SA387F11 casing
Where in code is this?
RE: SA387F11 casing
I guess holding preheating temperature till PWHT actually means you should never loose this temperature before and during welding plus perform PWHT immediately after welding to prevent cracking.
I don't think canceling preheating to let the plate cool down can cause ANY damage if for some reason welding cannot be performed immediately next. This material is good for a much higher temperature than 300F without changing properties. Just preheat up again and perform the whole procedure the next time when things are ready.
RE: SA387F11 casing
Second, does the Code require this? The answer for ASME Section I construction is no. See A-100 and PW-39.
For B31.1 conditionally yes, for P-No 3, 4 and 5A and 5B base materials, see section 131.6 Interuption of Welding and requirements.
RE: SA387F11 casing
This item I'm asking about is a non-pressure component and doesn't weld to any pressure retining item.
It will be neither Section I or B31.1.
Sorry for the confusion.
Bryan
RE: SA387F11 casing
RE: SA387F11 casing