Enter the axial load P that is trying to push the nozzle into the vessel or pull the nozzle out of the vessel. Enter this value according to the WRC 107 and PD 5500 conventions below.
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In WRC 107, 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 107 Force/Moment Conventions
PD 5500 Annex G Force/Moment Conventions