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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 > Service Limits.
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Click the Insert Row Command to insert a blank row in the grid view.
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In the Temperature column, type the temperature service limit.
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In the Pressure column, type the corresponding pressure service limit.
The Service Limits sheet in the Piping Materials Class.xls workbook corresponds to the Service Limits node. See Piping Reference Data.