Select Re-Pad when the nozzle has a pad. Select None if there is no pad. For FEA only, select Hub when the nozzle has a hub reinforcement.
For WRC 107/537, the software performs two separate analyses:
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Using the nozzle OD and the vessel wall thickness plus the reinforcing pad thickness
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Taking the pad into account by making the nozzle OD equal to the reinforcing pad diameter and assuming a solid attachment.
For FEA, the software performs analyses at critical locations such as the nozzle-shell junction and the edge of the pad.