Fire Case - Gas Expansion - Intergraph Smart Instrumentation - 13.1 - Reference - Hexagon PPM

Integraph Smart Instrumentation Sizing Equations

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English (United States)
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Intergraph Smart Instrumentation
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Reference
Smart Instrumentation Version
13.1
  1. Calculate upstream relieving pressure:

    *Pa [psi-a]

  2. Calculate Coefficient for critical flow equation:

  3. If heat absorption factor is entered, go to step 8.

  4. If normal pressure is not entered or normal temperature is not entered, a message appears: "Please enter heat absorption factor or normal pressure and normal temperature".

  5. Calculate Gas temperature at relieving conditions:

  6. If vessel wall temperature is not entered, the following message appears: “Please enter heat absorption factor or vessel wall temperature

  7. Calculate heat absorption factor:

  8. Estimate Required effective discharge area:

  9. If normal pressure,normal temperature, molecular mass, or vessel wall temperature is not entered, a message appears: "Maximum discharge cannot be calculated because normal pressure or normal temperature or molecular mass or vessel wall temperature is not entered". Then go to step 11.

  10. Calculate maximum discharge:

    Pa [psi-a], W[1b/h]

  11. For rupture disk application, calculate required effective discharge area: