The system has not been opened or altered after the hydro test.
PWHT does not weaken or alter the pressure-retaining capacity of the system.
The PWHT is part of the planned fabrication sequence, and the test pressure already applied exceeds the pressure that the
system would experience at the elevated PWHT temperature.
However, some client specifications override this and may demand a re-hydrotest after PWHT, especially for P91, which is
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