Gas, Steam - Intergraph Smart Instrumentation - Reference - Hexagon

Intergraph Smart Instrumentation Sizing Equations
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Intergraph Smart Instrumentation
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Reference
Smart Instrumentation Version
13.1

  1. Calculate XT:

    ControlValveSizing_GasSteam 1

  2. Calculate effective velocity head coefficients:

    ControlValveSizing_GasSteam 2a

    ControlValveSizing_GasSteam 2b

  3. Calculate FK:

    ControlValveSizing_GasSteam 3

  4. Calculate X:

    ControlValveSizing_GasSteam 4

  5. Calculate first value of CV:

    *d [in]

    ControlValveSizing_GasSteam 5

  6. Calculate FP:

    ControlValveSizing_GasSteam 6

  7. Calculate XTP:

    ControlValveSizing_GasSteam 7

  8. The condition ContrlValveSizing_GasSteam 8 determins:

    Case A - Critical flow

    1. Eps=0.667.

    2. Calculate new CV:

      ControlValveSizing_GasSteam 8a1

    Case B ControlValveSizing_GasSteam 8 CaseB a - Usual

    1. ControlValveSizing_GasSteam 8 Case B 2

    2. Calculate new CV:

      ControlValveSizing_GasSteam 8 Case B2

  9. Calculate the relative change in CV:

    ControlValveSizing_GasSteam

  10. Steps 6 to 9 are repeated until the relative change in CV is less than 0.001.

  11. Calculate outlet pipe velocity:

    ControlValveSizing_GasSteam 11

  12. Calculate outlet Max number:

    ControlValveSizing_GasSteam 12