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PWHT Requirements As Per UCS-56-1 General Notes b (1) & (2) 1

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SmallInfo

Petroleum
Oct 30, 2017
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Hi Experts
I'm a bit confused about the differences between these highlighted points. Can you please help me understand them better?
Thanks in Advance
DIFFERENCE_g0m0z7.png
 
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If the nominal thickness exceeds 1-1/4" you must preheat your welds, or else you have to do PWHT.

If the nominal thickness exceeds 1-1/2" you must ALWAYS do PWHT.
 
This is one of those rare cases where the Code language reads exactly as it means :)

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
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