Not necessary as in "having previously checked this, it is not the limiting factor for a standard nozzle".
Note that API-650 does allow variations in repad size, shape, thickness, etc., and I expect you'd be most likely to run into weld issues either using repads thicker than the shell or outer fillet welds smaller than the repad thickness.
If in doubt, do the check for the tank in question. It lends itself to a spreadsheet design.