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Open the Piping Specification.xls workbook.
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Select the PipeNominalDiameters sheet.
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Select a row after the Start keyword but before the End keyword, and click Insert > Rows.
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In the Spec Name column, type the name of your piping materials class.
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In the NPD column, type the nominal piping diameters that you want to define in your piping materials class.
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In the NPD Unit Type column, type the units for your NPD. For example, type mm or in.
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Save the Piping Specification.xls workbook.
The piping materials class must be defined on the PipingMaterialsClassData sheet.