Without knowing the piping matl or thickness, it would be imprudent to provide opinion about PWHT.
The flange it is assumed is a SO.
Certainly it is required to communicate to the inspector for reinspection/restamping.
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Considering that A333 gr.6 is P-1 , there appears to be no PWHT requirement as per 31.3 table 331.1.1purely for the butt weld joint between the pipe portion of nozzle and the piping to be hooked up with it considering the pipe thickness .
It would be better if the specification writeup is shared to understand as to why PWHT has been put in place for the piping concerned as per your statement.
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