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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 > Bend Angles 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 Bend Angle column, type the bend angle you want to allow.
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In the NPD column, type the nominal pipe diameter for which you are defining a bend angle.
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In the NPD Unit Type column, type the units for the NPD. For example, type mm or in.
The Bend Angles sheet in the Piping Materials Class.xls workbook corresponds to the Bend Angles Rule node in the Catalog task. See Piping Reference Data.