I understand that manufacturer recommendations should be followed when welding in valves of all types but my question is, "what is the reasoning why some would recommend, say gates, to be in the closed position when others say to have them open". My question also relates to PWHT, which seems to usually be the same as how the valve is welded in. My opinion is to have valves closed during welding and PWHT but bearing in mind the welding lead is on the same side of the valve as the welding is taking place. Also unless recommended by manufacturer the valve is not disassembled.
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