Hi Aslam
In case of WNC there also will be some load at nozzle. For me yes we need to check it.
Is your question whether that should have to qualify exactly with vendor/code allowable ?

That is quiye tricky one. Like say some people/company allow 50% more allowable load for pump when pump is in standby condition.

For WNC case also if calculated load exceed allowable with some small percentage I see no serious problem But it should not be very high.

I think it's better to know the exact situation. Since it,s not a operating/sustain case we may be quite flexible with the calculated figure.

Regards

Habib