Perform Instrument Sizing Calculations

The following sizing calculations can be performed for an instrument:

• Control Valve Sizing

• Flow Element Sizing

• Relief Valve Sizing

• Thermowell Vibrations

• Gas compressibility factor "Z"

For details of these calculations, refer to Instrument Sizing Calculations.

Important:
AVEVA Instrumentation provides Instrument Sizing Calculations for estimating purposes only. End-Users should not rely on AVEVA Instrumentation calculation results for design purposes. It is recommended to use certified equipment vendor calculations for final specification and purchasing.

1. To perform sizing calculations for an instrument, choose one of the following two options:

   • Select the instrument from the Instrument List and click Sizing Calculation in the Actions section of the List Tools tab (an error message is displayed if multiple instruments are selected).

   • Access the Edit window for the instrument, and click Sizing Calculation on its Datasheet tab.

     

2. If no sizing calculations have been performed for the instrument, a list of sizing calculation types to select from will be displayed in the Select a Calculation Type window.

   

3. Click on the required calculation type. A window is then displayed on which the calculation can be performed. For details, refer to Perform Calculations.

   Note: The first time that sizing calculation functionality is accessed, the following disclaimer is displayed before the list of calculation types:

   
   

   
   Click OK to display the list of calculation types. The disclaimer can be viewed again at any time by clicking the link below the list of calculation types.

   Note: The window for performing gas compressibility factor "Z" calculations is accessed from the Control Valve Sizing window.

4. If a sizing calculation (or calculations) has been performed, the window used to perform that calculation is displayed instead.

   The last type of calculation that was performed (if any) is displayed under the Sizing Calculation button on the Datasheet tab of the Edit window.

   

5. To select a different calculation to perform, double-click on the calculation type name under the button. The list of calculation types (see above) is then displayed.