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6.11 Flow Compensation Wizard
Description
A Flow Compensation Wizard is provided with the SCT 3000 which is
used to configure PV4, the flow variable of the SMV 3000 Multivariable
Transmitter. The flow compensation wizard will guide you in configuring
the PV4 output for either a standard flow equation or a dynamic
compensation flow equation.
• You can access the flow compensation wizard by pressing the
Wizard . . .
button in the SCT /SMV 3000 configuration
window.
• Refer to the SCT 3000 on-line User Manual for detailed
information for using the flow compensation wizard.
Standard Equation
The SMV 3000 standard flow equation is a simplified version of the
ASME MFC-3M flow equation. The SMV 3000 uses the standard
equation to compensate for the density changes in gases, liquids and steam
(saturated and superheated) and can be used with any primary flow
element that behaves according to the following equation:
Flow =
PKusr ƥ
See Appendix C for the SMV 3000 standard flow equations and examples
of flow configuration using the flow compensation wizard.
Dynamic
Compensation
Equation
The SMV 3000 dynamic compensation flow equation is the ASME flow
equation as described in ASME MFC-3M, “Measurement of Fluid Flow in
Pipes Using Orifice, Nozzle and Venturi.” The dynamic compensation
flow equation should be used to increase the flow measurement accuracy
and flow turndown for the primary elements listed in Table 18.
Table 18 Primary Flow Elements
Primary Element Application
Orifice
- Flange taps (ASME - ISO) D
≥ 2.3
Gases, liquids and steam
- Flange taps (ASME - ISO) 2 ≤ D ≤ 2.3
Gases, liquids and steam
- Corner taps (ASME - ISO) Gases, liquids and steam
- D and D/2 taps (ASME - ISO) Gases, liquids and steam
- 2.5D and 8D taps (ASME - ISO) Liquids
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