Calculate Sizing of a Relief Valve in Case of Fire - Intergraph Smart Instrumentation - Help

Use this procedure to calculate the size of a relief valve in case of fire.

• By default, Smart Instrumentation updates tag values from the current unit of measure to their value in a new unit of measure that you set. If on the Options menu you clear Automatic Unit Conversion, the software changes the unit of measure without recalculating the values. Therefore, to protect the integrity of your values, on the Options menu, select Automatic Unit Conversion.

• To highlight the fields that are required for a calculation, on the Options menu, select Highlight Process Data.

1. With a calculation data sheet open for a relief valve item, scroll to the SIZING DATA section.

2. From the Case (fire/non-fire) list, select Fire.

3. Enter all the required values, especially the Area and Properties @relieving condition values. Some properties vary for the Liquid and Gas fluid states.

4. Complete the Relief Valve Calculation dialog, and select the Calculate command button to get the calculation results.

   Calculation is disabled for N/A or other fluid state.

The Sizing basis and other calculation results (the calculated area, selected area, and Orifice designation) appear on specifications based on Smart Instrumentation library form # 7.