Displays properties for pipe nominal diameters. A pipe nominal diameter defines what pipe diameters are valid for the different piping material classes.
The order in which the properties display in your view depends on your configuration.
Nominal Diameter
Specifies the nominal piping diameter for the object. If displays in the box, the nominal diameter is derived from a rule and not editable. If the icon does not display, the value is user defined.
Unit Type
Specifies the units for the NPD value. Select mm or in from the list.