Calculate the Sizing of a Relief Valve - Intergraph Smart Instrumentation - Help

Intergraph Smart Instrumentation Help

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English
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Intergraph Smart Instrumentation
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Smart Instrumentation Version
13.1

Use this procedure to calculate the size of a relief valve. This option works for single phase fluids only and for all fluid states, except for Solid/Powder and N/A or other.

  • 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. Open a calculation window for a relief valve item.

  2. If you defined multiple process cases, from the Case list, select the case that you want to calculate.

  3. Make sure that you enter process data in all the fields in the data sheet that are required for calculation.

    SHARED Tip Although from the Pressure/Vacuum list, you can select Vacuum only or Pressure and vacuum, Smart Instrumentation calculates pressure relief valves only, and not vacuum relief valves or dual mode pressure/vacuum relief valves. The vacuum service set point value that you enter beside Valve Set Vacuum is displayed in the process data report for this instrument, but not in the calculation report.

  4. Select Save Icon 16bit.

  5. Select to display the Relief Valve Calculation dialog.

    SHARED Tip The default selection for Use Rupture Disk at the inlet? is No. Selecting Yes enables the Combination Capacity factor (Kc) field below.

  6. Select user-defined conditions for the relief valve:

    • ASME Capacity Certification requirement.

    • Sizing basis.

    • Rupture Disk at the inlet use.

  7. If you are using the Bellows valve style in liquid or water applications, you can also let Smart Instrumentation calculate the correction factor for back pressure (Kw) by checking the Calculate check box.

  8. Type the required value for Effective coefficient of discharge (Kd) or select Default to use the Smart Instrumentation default value.

  9. If available, type the required value for Combination capacity factor (Kc) or select Default to use the Smart Instrumentation default value.

  10. Select the Calculate command button.

  11. Select Close to return to the calculation data sheet.