As per B31.3
a) In the case of branch connections, metal (other than weld metal) added as reinforcement, whether an integral part of a branch fitting or attached as a reinforcing pad or saddle, shall not be considered in determining heat treatment requirements. Heat treatment is required, however, when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment, even though the thickness of the components at the joint is less than the minimum thickness .
The question is what if thickness of components at joint like Tb ( branch pipe )or Th( header) is greater than the minimum thickness requiring PWHT. governing thickness would be based on weld metal through groove or Tb or Th if all are above minimum thickness requiring PWHT. it is a general question and i would be glad to hear from you.
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