Dear Members,
We have crude and petroleum tanks in which shell plates thickness vary from 8 mm to 45 mm and the tanks are constructed by our contarctors. We just want to be sure whether PWHT has to be carried out or not in vertical and horizontal joints. Our contrcator says as per API 650 there will be no PWHT of shell plates. I also refered API 650 but couldnt find any thing about pwht of shell plates. please anyone help me out on this issues, in case pwht is to be carried out for shell plates, kindly provide the reference clause no from API 650.
5.7.4 Thermal Stress Relief. I know but If i am not wrong the below clause is for the flush type cleanout fittings rather than the shell butt welded plates.
Regards
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