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PWHT vs PHT

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Trig_Shah

Mechanical
Joined
Sep 27, 2016
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5
Location
US
I am new to Vessel Industry and would like to know the differance between PHT and PWHT. I have a vessel that has PHT stamped on it and I wanted to know does it mean the entire vessel is Post Weld Heat Treated or just the portions of the vessel (like Nozzle...) is Heat Treated.
 
Partial Heat Treatment - only part of the vessel has been stress relieved.
 
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