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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 > Weld Gap 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 Weld Type column, type the weld type code.
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Define the NPD range for the weld gap.
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In the Weld Gap column, type the gap between the welded ends of the welded joint. Be sure to include the units when defining this value, for example, 3mm.
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Valid weld type codes are listed in the Weld Type select list.
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The Weld Gap Rule sheet in the Piping Materials Class.xls workbook corresponds to the Weld Gap Rule node. See Piping Reference Data.