Heat treatment to LPG sphere
Heat treatment to LPG sphere
(OP)
Once you have alleviated stress with heat treatment in an LPG sphere, do you have to X ray again?, or another NDT, acording to ASME VIII section 1.
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Heat treatment to LPG sphere
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RE: Heat treatment to LPG sphere
does not care if you radiograph before or after PWHT.
Many users/buyers require it to be done after PWHT.
RE: Heat treatment to LPG sphere
RE: Heat treatment to LPG sphere
RE: Heat treatment to LPG sphere
Additionally, the plate material should be adequate by ensuring the suitability by asking additional test in the purchase order. If you look at the ASME material standards, there are some nonmondatory requirements (S1, S2, S3, etc...) that purchaser can ask on the plate. All of them are to make sure the end product is adequate and in accordance with the design.
Otherwise, it will cause a lot of problem if yo find out some part or entire welds are not adequate after the PWHT. Each repair will/may require another PWHT and the same NDT. So, it will become an endless exercise and very costly.
Ibrahim Demir