Enter the axial load P that is trying to push the nozzle into the vessel or pull the nozzle out of the vessel. Define this value according to the WRC 297 and PD 5500 conventions below.
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In WRC 297, positive loads try to "push" the nozzle while negative loads try to "pull" the nozzle.
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In PD 5500, positive loads try to "pull" the nozzle while negative loads try to "push" the nozzle.
Axial force does not include the effect of pressure thrust.
WRC Bulletin 297 Force/Moment Conventions
PD 5500 Annex G Force/Moment Conventions