Calculation of Pressure Loss - Intergraph Smart Instrumentation - 13.1 - Reference - Hexagon PPM

Integraph Smart Instrumentation Sizing Equations

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Intergraph Smart Instrumentation
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Reference
Smart Instrumentation Version
13.1
  1. Calculate internal pipe diameter at flow temperature:

  2. Calculate correction factor for steam quality (for liguid, water, and steam, Fs=1):

  3. Calculate orifice diameter at flow temperature.

    1. For Venturi tubes and nozzles:

    2. For orifice plates:

  4. Calculate pipe Reynolds number (W[kg/s]):

  5. Calculate b - ratio:

  6. Calculate discharge coefficient. See Appendix.

  7. Calculate critical flow rate.

    1. For liquid/water:

    2. For gas/steam

  8. Checking for critical flow and pressure loss calculation.

    1. Case A - Critical flow: W>0.999*Wcr and W<1.001*Wcr.

      For this case, pressure loss:

    2. Case B - Wrong data: W=>1.001*Wcr. Flow rate cannot be achieved, check data.

    3. Case C- Sub-critical flow: W<=0.999*Wcr:

      First estimate for differential range:

    4. Calculate discharge coefficient. See Appendix.

    5. Calculate gas expansion factor (for liguid and water, Eps=1).

      1. For Venturi tubes and nozzles:

      2. For Orifice plates:

    6. Calculate new differential range (W[kg/s]):

    7. Calculate the relative change in the differential range:

    8. Repeat steps e to g until the relative change in the DP is less than 0.0001.

    9. Calculate pressure loss: