Damaged Flange
Damaged Flange
(OP)
Ok, I hate to ask a question like this with so little detail.... but I have to as it is bugging me.
Imagine a ~4"OD flange coming off a PV. Flange is about 18" long. It has been bent out of alignment.
No PV welders are available. It needs to be put back into alignment. Solutions?
PS- feel free to make any assumptions you want - that's all the info I have.
Imagine a ~4"OD flange coming off a PV. Flange is about 18" long. It has been bent out of alignment.
No PV welders are available. It needs to be put back into alignment. Solutions?
PS- feel free to make any assumptions you want - that's all the info I have.





RE: Damaged Flange
RE: Damaged Flange
The 4" OD flange tells me it is a small nozzle only NPS 0.5 to 1" which is flexible and prone to damage in shipment. Length of 18" is 3 times more than typical and even more likely to be bent during handling vessel.
If the amount of mis-alignment is small, then metengr's recommendation could be done. If the mis-alignment is very small (less than 1" ?) then a straightening without heating (especially for austenitic SS)might be acceptable with followup exam and testing.
This assumes that most deformation occurred in the nozzle neck. If most of deformation occurred at the shell wall then weld attachment may have significant damage if the mis-alignment is large (? greater than 3" = 9 deg. out)
RE: Damaged Flange
Is this an ASME coded vessel ?
This type of modification will require the services of a contractor with a National Board "repair" stamp.
Any possiblity the nozzle could be cut and shortened ?
(I agree that 18 inches is a very long nozzle neck)
-MJC
RE: Damaged Flange