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In the tree view, click Piping > Piping Specification > Piping Materials Classes.
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In the Piping Materials Classes branch, open a specification and click Piping Materials Class Rules > Pipe Bend Radius Multiplier Rule.
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Click the Insert Row Command to insert a blank row in the grid view.
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In the NPD column, type the nominal pipe diameter for which you are defining a bend radius.
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In the NPD Unit Type column, type the units for the NPD. For example, type mm or in.
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In the Bend Radius Multiplier column, type the NPD multiplier to calculate the bend radius.
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In the Bend Radius column, type the bend radius for the NPD. Leave this column empty if you define a Bend Radius Multiplier.
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For more information about each allowable pipe bend radius property that you can define, see Pipe Bend Radius Multiplier Rule.
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The Pipe Bend Radii sheet in the Piping Material Class.xls workbook corresponds to the Pipe Bend Radius Multiplier Rule node in the Catalog task. See Piping Reference Data.