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Min number of thermocouples for PWHT

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bob74r

bob74r

Industrial
Joined
Nov 25, 2009
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19
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Is there anywhere in any code that actually states the number of thermocouples for PWHT. I know AWS has a "recommended" number but I cant seem to find anywhere that states required. Pipe is built to B31.3.
 
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No, this is a process detail. There should be a procedure for PWHT, and this procedure would contain placement of TC's, heating band, sooaking band and the gradient band details on size and location.
 
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