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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 > Permissible Taps.
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Click the Insert Row Command to insert a blank row in the grid view.
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In the Permissible Tap Number column, enter the tap number that you want to allow in the piping materials class.
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In the Is Preferred Tap column, enter TRUE if the tap number is the preferred tap. Enter FALSE if the tap is not the preferred tap.
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The tap numbers must be defined using Tap Properties.
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The Permissible Taps sheet in the Piping Materials Class.xls workbook corresponds to the Permissible Taps node. See Piping Reference Data.