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I do not have a case but it is general question came to my mind. I was thinking about the SAME vessel, there is heat treatment during the fabrication of plate and after completing the pressure vessel there is another Heat treatment! My question is mainly about CS.

I do not think you need to do PWHT because you are already covered by doing cladding.

What is the affect of doing the Heat treatment twice on the material? Does it enhance the mechanical property or the opposite?

BACKGROUND The 2007 Edition of ASME Section VIII, Division.2 of the ASME Boiler and Pressure Vessel Code is a complete rewrite of the 2004 edition that updates and modernizes the Code to provide for major technical advances in pressure vessel analysis, design, construction and related sciences...

There is no limit for the speed. Hoever, you need to control the flow that go to the tank to ensure there will be no high movment in the floud