[MW:2625] service wise requirement for PWHT

Hello to all of you.
Dear friends I have one query which I like to ask you
As per table 331.1.1 of ASME B31.3,it is mentioned here the
requirement of PWHT as per thickness and tensile strength for
mentioned materials.But how can I get information according to service
vise? This requirement is depend on project specification but i want
to know that, on which basis they calculate this requirement? Which
factors will consider during calculation? and how this factors affect
during service?
Regards
SADIQUE

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