The option enables you to enter a built-up back pressure value, which is considered for calculation when sizing the relief valves. The result is displayed in the NOTES section of the calculation data sheet, under Program Notes.
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With a calculation data sheet open for a relief valve item, on the Actions menu, select Enter Built-up Back Pressure.
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In the Built-up Back Pressure dialog, type the required value, select the unit of measure, and select gage or absolute pressure.
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Select OK.