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The A1 value is being forced to zero by a setting in the vessel screen. If the “Use excess vessel wall thickness for nozzle reinforcement calculations” box is not selected, material from the host will not be used for reinforcement, resulting in A1=0. This box should be selected unless your internal requirements or those of a customer indicate that A1 should not be considered. To change this setting, select Vessel Information from the Vessel menu on the Components pane and go to the Design tab.
The pipe size picked for the tb3 determination is too big
Occasionally, DesignCalcs may appear to select a bigger pipe size than it should be when determining the thickness from Table UG-45. The code requires that the pipe size selected for determining the thickness be based on the outside diameter of the nozzle. If the nozzle diameter is bigger than the outside diameter listed for a specific NPS in ASME B36.10M, the next size pipe is chosen.
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