Hello Anilkumar
The UG-45 requirement is there to ensure the nozzles subject to external loads from piping thrusts is thick enough to accommodate those loads, without doing a detailed analysis. For example, in the code, that requirement is not required for manways, because piping is not attached to manways. Now, if you have a nozzle serving the purpose of drainage, it too might not have attached pipework. In which case you could probably treat in the same way as one would do with a manway. In the PV Elite nozzle dialogue screen, there a check box asking if the nozzle is a manway. If that box is checked, the UG-45 analysis will not be done by PV Elite.
As to you question about having part of the nozzle satisfying UG-45, I see not reason why you cannot do that. The pressure vessel envelope terminates at the first joint in the nozzle, so presumably it is not a code violation.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM