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Local PWHT of ASME VIII Div1 Vessel

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YMech

Mechanical
Joined
Aug 29, 2017
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22
Location
US
We have a local heat matching (Miller Proheat 35) and are fabricating a Vessel to ASME VIII, div 1 - requiring PWHT (made of SA 516-70 material). There are 4 longitudinal seams and 5 circumferential seams. Does anyone have experience in using local PWHT on longitudinal seams? Would like to do heat treat each weld at a time, so would need to do the long seams before getting into the circ seams.
 
If you are fabricating a vessel, I would outsource the PWHT to a heat treatment vendor that has a car bottom furnace or oven to perform the PWHT on the entire vessel at once and done only once.
 
We have a 60" x 120" that we are going to have local PWHT. I have never tried this method, but find a HT company that specializes in this, and they can take care of you. I believe they use heat blankets. What is the wall thickness thickness of the vessel?

There is no situation so bad that you cant make it worse. Cmdr_Hadfield
 
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