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1/99 SMV 3000 Transmitter User’s Manual 179
C.2 Standard Flow Equation, Continued
Example:
Superheated Steam
Using an Averaging
Pitot Tube
An engineer has specified a SMV 3000 Smart Multivariable Transmitter
to compensate for steam density changes and to calculate the mass
flowrate of superheated steam using an averaging pitot tube. The engineer
has sized the averaging pitot tube to produce a differential pressure of
13.21 inches H
2
O at 45,000 lb/hr. The flowing pressure is 294.7 psia,
flowing temperature is 590 degrees F, and flowing density is 0.49659
lbs/ft
3
.
The steps in Table C-2 show how to configure the SMV to calculate the
PV4 flow variable for this application.
Table D-2 Superheated Steam using an Averaging Pitot Tube
Configuration Example
Step Action
1
Select a template for the SMV 3000 model you have for your flow
application.
Select superheated steam mass flow in the Algorithm field of the
FlowAlg tab and then select the Engineering Units (lb/h) on the
FlowConf tab card.
2
Click the Wizard . . .
on the SCT/SMV 3000 configuration window to
access the Flow Compensation Wizard Equation Model page.
3
Select Standard from the Equation Model list box on the Equation
Model page of the Flow Compensation Wizard to launch the Kuser
Model, then click Next to proceed to the Fluid Type page.
4
Select Steam as the fluid type from the list box on the Fluid Type
page, then click Next to proceed to the Process Data page.
5
Enter the relevant flow process data from the Averaging Pitot Tube
Sizing Data Sheet into the appropriate entry fields on the Process
Data page as follows:
Normal Flowrate = 45,000 lb/hr
Normal DP = 13.21 inches H
2
O @ 39.2 °F
Design Density = 0.49659 lbs/ft
3
You can change the engineering units by clicking on the text box with
the right mouse button.
Click Next to proceed to the Flowing Variables page.
Continued on next page