Bipin,
Look in the output of the WRC 107, if the curves for looking up stress due to load "P" are exceeded. If that is the case, then you may be using a wrong tool. WRC 107 simulates pressure thrust as radial load on the vessel puling the nozzle out.
Instead, use WRC 368, it provides stresses due to internal pressure including pressure thrust. There is a check box in PV Elite's nozzle dialog, Local stress Analysis Tab.
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Best Regards,
Mandeep Singh
CADWorx & Analysis Solutions
Hexagon PPM