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
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Comments