weld buil up on pressure vessel nozzle hole- legal?
weld buil up on pressure vessel nozzle hole- legal?
(OP)
T here is nothing mentioned in ASME VIII about the subject. Tan somebody help me to know how much is allowed?
The operator made the nozzle hole in wrong direction so it must be modified to its right.
Thickness of the vessel is 100mm and modifying the hole needs about 100mm build up!!!
I know it's not logical but we couldn't find any reference.
The operator made the nozzle hole in wrong direction so it must be modified to its right.
Thickness of the vessel is 100mm and modifying the hole needs about 100mm build up!!!
I know it's not logical but we couldn't find any reference.





RE: weld buil up on pressure vessel nozzle hole- legal?
Cheers,
gr2vessels
RE: weld buil up on pressure vessel nozzle hole- legal?
RE: weld buil up on pressure vessel nozzle hole- legal?
we thought about both patching and buttering but we were not sure that buttering (or build up) is permissible for 100mm. it is equal to the plate thickness.
I believe that patching is more reliable than 100mm or even more weld build up. our contractor are insisting to build up instead of patching.
for your information, the plate is not weld overlay (explosion cladded type)and clad material is not considered to designing the required strength.
any other comment would be appreciated.
RE: weld buil up on pressure vessel nozzle hole- legal?
From a practical standpoint, since you're only relocating the opening around 4", in 4" thick material, even using a patch plate will result in pretty much 100% weld metal being used, however, it would be easier to perform RT on the repair area with a patch plate. Keep in mind you don't have to weld the patch around its entire circumference, you just need to weld the area outside the new opening plus an amount sufficient to facilitate welding and NDE.
RE: weld buil up on pressure vessel nozzle hole- legal?
black lines shows the present direction (wrong direction) and should be modified to red lines.
so the gray triangle must be weld build up.
Or make the hole larger, and prepare circular patch to close the hole and make the hole in right direction into the patch.
http://files.engineering.com/getfile.aspx
RE: weld buil up on pressure vessel nozzle hole- legal?
RE: weld buil up on pressure vessel nozzle hole- legal?
RE: weld buil up on pressure vessel nozzle hole- legal?
If this is a full penetration welded nozzle, for what I see a triangle with original opening of about 2 in around, now one side will have extra 2x2
area triangle, it is not that much fill after all. one side of the triangle will open +2inch.