How to determince weld joint thickness set-in and set on

How to determine base metal wall thickness for set-in and set on weld configurations.
Nozzle-Set-in-and-Set-on

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ASME IX, QW-403.16:
(a) Groove weld of SET-ON nozzle shall be based on the nozzle or branch pipe O.D.
(b) Groove weld of SET-IN nozzle shall be based on the shell, head or pipe run O.D.

If pressure vessel design RT-1, these joints are in category D.

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