It depends on where the nozzle loads where calculated. If the loads were calculated at the flange then you build a model with the nozzle and apply the load at the flange.
I have Gould end suction SSH pump (4SH2K52B0) pumping water out of cooling tower via 2" piping maybe 2 ft long. On loss of CW make-up and subsequent shutdown air gets introduced into system. Operator start the pump but forgets to bleed air from suction at start-up. This later result is a...