Blocked Flow - Liquid Relief - 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

Requiring ASME capacity certification

  1. Calculate total back pressure:

  2. Effective coefficient of discharge: Kd =0.65 (if Kd is not entered by user).

  3. Determine correction factor for back pressure:

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

    2. For Bellows valve:

      Case Pb / Ps <0.16:

      Kw =1

      Case 0.16 < Pb / Ps < 0.5:

      Kw = 1.152 -- 0.95•Pb / Ps

      Case Pb / Ps >0.5:

      Kw = 0.677

  4. Calculate upstream relieving pressure:

    *Pup[psi-g]

  5. Estimate required effective discharge area:

    *W[US gal/min], Pup [psi-g]

  6. Calculate Reynolds number:

  7. Calculate correction factor for viscosity:

  8. Calculate required effective discharge area:

    1. With Rupture disk:

    2. Without Rupture disk:

Not requiring ASME capacity certification

  1. Calculate total back pressure:

  2. Effective coefficient of discharge: Kd =0.62 (if Kd is not entered by user).

  3. Determine correction factor for back pressure:

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

    2. For Bellows valve:

      Case Pb / Ps <0.16:

      Kw =1

      Case 0.16 < Pb / Ps < 0.5:

      Kw = 1.152 -- 0.95•Pb / Ps

      Case Pb / Ps >0.5:

      Kw = 0.677

  4. Calculate correction factor for overpressure:

  5. Estimate required effective discharge area:

    *W[US gal/min]

  6. Calculate Reynolds number:

  7. Calculate correction factor for viscosity:

  8. Calculate required effective discharge area:

    1. With Rupture disk:

    2. Without Rupture disk: