You can view all the Nominal Piping Diameters (NPD) for a selected spec and its associated revision.
The NPD values are displayed only for the piping component.
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Select a spec from the PMC/Specs list.
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Click Get NPDs, and then from the Allowable Nominal Diameters section, click the NPD list.
Click the NPD Units list to see the corresponding units for the selected NPD.