Calculate Orifice Flowmeter Parameters - Intergraph Smart Instrumentation - Help

Intergraph Smart Instrumentation Help

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Intergraph Smart Instrumentation
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Smart Instrumentation Version
13.1

This option enables you to calculate orifice flowmeter parameters based on the fluid state values of the flowmeter and values retrieved from the Process Data module. In a calculation data sheet for a flowmeter item, you can accept or modify these values, or enter additional values. Then, in the Flowmeter Calculation dialog, you calculate orifice flowmeter parameters for a selected orifice flowmeter and view the calculation results.

  1. Open the Flowmeter Calculation dialog for the orifice flowmeter that you want to calculate.

  2. From the Flowmeter type list, select the required orifice flowmeter.

    SHARED Tip The Quarter of Circle Orifice (also known as Quadrant Edge Orifice) sizing is in accordance with the new edition of British Standard (BS 1042: Section 1.2; 1989).

  3. From the Sub type list, select the required sub type for the current orifice flowmeter.

  4. Type the required values in the fields next to the other two calculation options that you have not selected. Smart Instrumentation will then use these values to calculate the tube flowmeter parameters for the selected option.

  5. Under Pipe, view the data in the Material field and the Linear expansion coefficient field.

    • The data in the Pipe material field is retrieved from the Process Data module.

    • The linear expansion coefficient value for the displayed pipe is the standard value taken from Smart Instrumentation database.

    • From the Linear expansion coefficient list of units of measure, you can select a required unit of measure for the current linear expansion coefficient.

  6. Under Orifice, from the Orifice material list, select the orifice material.

    • The Orifice material list contains standard options provided with Smart Instrumentation. If the required orifice material is not in the list, select from the list the MATERIAL NOT LISTED option and in the Linear expansion coefficient field type the required linear expansion coefficient.

    • If you select a standard option from the Orifice material list, you cannot change the linear expansion coefficient value for the displayed orifice material because this is the standard value taken from Smart Instrumentation database.

  7. In the Diameter of bleed/vent hole field, type the required diameter of the bleed/vent hole or accept the given value.

    • When calculating the orifice flowmeter parameters for the Steam fluid state, in the Water in steam, %wt field, type the percentage of water in steam.

    • If the value in the Full scale flow field has been changed, you can select PPM All Outputs Graphic to get the values from the Process Data module.

  8. Under Select calculate field, select one of the following options to calculate the orifice flowmeter parameters:

    • Orifice diameter

    • Full scale flow

    • Differential range

  9. Select Calculate.

    Calculation is disabled for N/A or other fluid state.

  10. Examine the calculation results and possible calibration error messages.

    • The units of pressure loss derive from the default units for Differential Range (Flow) set in the Units of Measure and Accuracy dialog.

    • When sizing flowmeters for Liquids and Water, Smart Instrumentation checks whether Downstream pressure is greater than Vapor pressure. If it is, the program continues sizing. If it is not, critical flow takes place, and the program advises you to check the input data.

  11. To recalculate the orifice flowmeter parameters, enter the new data and select the Calculate command button.

  12. Select Close to return to the calculation data sheet.