Calculation of Flow rate - Intergraph Smart Instrumentation - 13.1 - Reference - Hexagon PPM

Integraph Smart Instrumentation Sizing Equations

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  1. Calculate internal pipe diameter at flow temperature:

  2. Calculate correction factor for steam quality (for liquid, water, and gas FS=1);

  3. Calculate orifice diameter at flow temperature.

    1. For Lo-Loss tube, nozzles,and Venturi tubes:

    2. For other orifices:

  4. Calculate b ratio.

    1. For all Flow meters except Segmental orifices:

    2. Segmental orifices.

      1. Calculate segmental radius:

      2. Calculate b ratio.

        HS is calculated with the help of HS0 in accordance with step 3b.

  5. Calculate gas expansion factor (for liquid and water, EPS=1).

    1. For square edge orifice with 2½D and 8D pipe taps:

    2. For Lo-Loss tube, nozzles,and Venturi tubes:

    3. For eccentric orifices:

    4. For square-edge orifices specified in ISO 5167-2003 (flange tappings, corner tappings, and radius tappings):

    5. For other Flow meters:

  6. Calculate first estimate for flow rate:

    *W0 [kg/s]

  7. Calculate Pipe Reynolds number:

    *W0 [kg/s]

  8. Calculate discharge coefficient.For more information see the Appendix.

  9. Calculate new flow rate:


  10. For quarter of circle (Quadrant Edge) orifice, Lo-loss tube, Venturi tubes, and Segmental orifices go to step 13.

  11. Calculate the relative change in Flow rate:

  12. Repeat steps 7 to 11 until the relative change in the flow rate is less than 0.0001.

  13. For quarter of circle (Quadrant Edge) orifice, calculate radius of upstream profile: