It is not a good practice but the code (ASME VIII-1) does not prohibit repairs in general.
If you have done spot radiography then you have to take care about additional RT increments.
It is an NCR since you have affected the out of roundness.
I would suggest to make a mock-up first
Dr. G. Dilintas
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Krissy D <krissy.diva@gmail.com>
Sent by: materials-welding@googlegroups.com 16/02/2010 13:18
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Posting a query from a Message Board:
Good Morning Everybody,
We have following situation during fabrication of a pressure vessel :
There are 3 Long seams in a fabricated Shell section.
Welding of all 3 seams are completed and all NDT are balance for these seams.
There are some stringent dimensional requirements as per client's specification. Due to high thickness, significant distortion (peak-in/out) had occurred. Now production people is planning to correct it. For that, they have removed some 50% of one side of weld in one particular joint by grinding. And planned to re-weld it to negate the distortion effect.
Shell material is SA387 Gr 11 Cl 2 with SA 240 Type 410S cladding having thickness of 44.5+4.5 mm.
Pre-heating, Interpass Temp., DHT & ISR/PWHT are required as per WPS.
Now my question is
(1) Is it allowed as per general engineering practice of pressure vessel fabrication ?
(2) Can I call it a repair and can use WPS of weld-repair ?
(3) Is it a case of NCR ?
(4) Is it acceptable as per Code ?
Please suggest your views on this.
Regards,
Krissy
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