This option enables you to calculate the restriction device parameters based on the fluid state values of a 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 the restriction device parameters and view the calculation results.
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Open the Flowmeter Calculation dialog for the restriction device that you want to calculate.
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From the Flowmeter type list, select Restriction Device.
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From the Sub type list, select the restriction device sub type.
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Type the appropriate 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.
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In the Pipe group box, view the data in the Material field and the corresponding linear expansion coefficient value in the Linear expansion coefficient field.
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The data in the Pipe material field is retrieved from the Process Data module.
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The linear expansion coefficient value for the displayed pipe is the standard value taken from the Smart Instrumentation database.
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From the Linear expansion coefficient list of units of measure, you can select a required unit of measure for the current linear expansion coefficient.
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In the Orifice group box, from the Material list, select the orifice material of the restriction device.
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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.
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If you select a standard option from the Material list, you cannot change the linear expansion coefficient value for the displayed orifice material because this is the standard value taken from the Smart Instrumentation database.
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In the Diameter of the bleed/vent hole field, accept the displayed value, or type the diameter of the bleed/vent hole.
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If needed, clear the Calculate discharge coefficient check box to enable you to type the discharge coefficient.
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If you leave the Calculate discharge coefficient check box selected, the software automatically calculates the discharge coefficient according to the preset values.
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When calculating the restriction device parameters for the Steam fluid state, in the Water in steam, %wt field, type the percentage of water in steam.
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If the value in the Full scale flow field has been changed, you can select
to get the values from the Process Data module.
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Under Select calculate field, select one of the following options to calculate the restriction device parameters:
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Orifice diameter
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Full scale flow
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Pressure loss
Do not type any values in the field next to the selected calculation option.
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Select OK to carry out and display the calculation results.
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Examine the calculation results and possible calibration error messages.
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The values of pressure loss in the results comes from the default values for differential range flow set in the Units of Measure and Accuracy dialog.
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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.
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To recalculate the restriction device parameters, enter the new data and then select Calculate.
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Select Close to return to the calculation data sheet, where you can select
to generate a report for the current calculation result. Error messages also appear
in a calculation report.