Hello Mohammed89,
PV Elite cannot put a stiffening ring on the nozzle. The first thing to consider is the necessity of such a stiffening ring. Usually nozzles have a much large D/t ration than does the shell to which it is attached. In the nozzle analysis, PV Elite normally check the nozzle for external pressure.
If you have any doubts, model a nozzle and its sump head alone, to see if the rings are required.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM