C.3

Dynamic Compensation Flow Equation, Continued

Example: Air

 

 

 

An engineer has specified a SMV 3000 Smart Multivariable Transmitter

 

 

 

to dynamically compensate and calculate the standard volumetric flowrate

 

 

 

of air through a standard 304 SS orifice meter with flange taps. The

 

 

 

engineer has sized the orifice meter to produce a differential pressure of 10

 

 

 

inches H2O at 175 standard cubic feet per minute (SCFM). The flowing

 

 

 

pressure is 40 psia, the flowing temperature is 60 degrees F, the flowing

 

 

 

density is 0.2079 lbs/ft3, and the standard density if 0.0764 lbs/ft3.

 

 

 

The steps in Table C-4 shows how to configure the SMV to calculate the

 

 

 

PV4 flow variable for this application.

 

 

 

 

 

 

 

Table C-4

Air Configuration Example

Step

1

2

3

4

5

Action

Select a template for the SMV 3000 model you have for your flow application.

Select Standard Volumetric flow in the Algorithm field of the FlowAlg tab and then select the Engineering Units (CFM) on the FlowConf tab card.

Click the Wizard . . . on the SCT/SMV 3000 configuration window to

access the Flow Compensation Wizard Equation Model page.

Select Dynamic Corrections from the list box on the Equation Model page of the Flow Compensation Wizard to invoke the Dynamic Flow Compensation Model, then click Next to proceed to the Flow Element Properties page.

Enter the relevant information from the Orifice Sizing Data Sheet in each entry field of the Flow Element Properties page:

Element Type

= Flange tap

 

 

(D Greater than 2.3 inches)

Bore Diameter

= 1. 5698 inches

Material

=

304 SS

Flowing Temperature

=

60°F

The expansion coefficient is automatically calculated based on the entered data.

Click Next to proceed to the Fluid State page.

Select the fluid state as Gas from the list box on the Fluid State page, then click Next to proceed to the Gas Flow page.

Continued on Next page

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Image 197
Honeywell SMV 3000 user manual Table C-4 Air Configuration Example, Example Air