This dialog opens when, in the Properties window, you select the Calc button beside the Piping Materials Class property (PMC) for a pipe run. It allows you to choose a PMC from a piping specification. This functionality is not available unless the proper settings are defined in Options Manager and the applicable Program IDs are assigned in Data Dictionary Manager. See Using the Piping Specification Utility.
Piping materials class
Lists the PMCs in your piping specification. Choose one, and depending on the settings in Options Manager, property validation for piping segments and inline components is run. This can include checking service limits.