minimum thickness for apply PWHT

hai all,

i have a doubt with PWHT process. we are using asme ix and asme B31.1 for contruction code.

i already made prewps for this,

material P11 to P11 ( p no 4 and group no 1) and 6'' sch120 wall thickness 14.27mm.

my question is. what the minimum thickness for applying PWHT?

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