Fire Case - Liquid Filled Vessel - 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 maximum discharge:

  2. Calculate upstream relieving pressure:

  3. Calculate Total back pressure:

  4. Calculate Critical flow throat pressure:

  5. Effective coefficient of discharge: .

  6. The condition determines:

    Case A - Critical flow

    1. Calculate Coefficient for critical flow equation:

    2. Calculate Capacity correction factor due to back pressure (if Kb is not entered by user).

      1. For conventional and Pilot operated valves,.Kb =1.

      2. For Bellows valve:

    3. Estimate Required effective discharge area:

Case B - Sub-critical flow: Bellows Valve.

  1. Calculate Cr:

  2. If Capacity correction factor due to back pressure is not entered by user, Kb =1.

  3. Estimate Required effective discharge area:

Case c - Sub-critical flow: Conventional and Pilot operated valves..

  1. Calculate Coefficient for sub-critical flow equation: *Pb [psi-a]

  2. Estimate Required effective discharge area:

7. For Rupture disk application, calculate Required effective discharge area:

A = A0 / Kcc