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Open the Piping Specification.xls workbook.
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Select the MinimumPipeLengthRulePerSpec sheet.
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Select a row after the Start keyword but before the End keyword, and click Insert > Rows.
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Type the name of your piping materials class name.
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In the NPD column, type the nominal pipe diameter for which you are defining minimum values.
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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 Minimum Pipe Length column, type the minimum pipe length that you will allow for the specified NPD.
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In the Preferred Minimum Pipe Length column, type your preferred minimum pipe length for the specified NPD.
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Save the Piping Specification.xls workbook.
The piping materials class must be defined on the PipingMaterialsClassData sheet.