We are going to construct an above ground storage tank per API 650.
Regarding the PWHT requirements:
1) Do we must PWHT whole the thickened insert plate together with the welded reinforcement pad and the welded nozzle? OR Can we only PWHT for the welded re-pad together with the welded nozzle...
ASME B31.3-F308.2 state that "The need for venting the space between the welds in double-welded..."
Please help me in clarification it. Is this mean drill a hole for venting during welding? And after that is need weld to close it?
Thanks,
nlgcode