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188 SMV 3000 Transmitter User’s Manual 1/99
C.3 Dynamic Compensation Flow Equation, Continued
SMV Operation in a
Steam Application
When operating the SMV in a steam application there are number of
considerations you should be aware of.
• Be sure the process is at or above saturation when operating the SMV,
since the SMV does not calculate flow when the process is below
saturation.
• Operating limit for absolute pressure input is 750 psia(for Model
SMV125), but SMV will continue to make calculations for inputs up
to 1500 psia.
• SMV Model SMG170 will operate and calculate to 3000 psig. At
pressures greater than 2000 psia you must operate at less than 100 °F
of saturation temperature.
• Operating range for temperature input is saturation to 1500 °F
(815.5 °C), assuming that the temperature sensor used (RTD or
thermocouple) can cover this range, with the exception noted above.
Example:
Superheated Steam
An engineer has specified a SMV 3000 Smart Multivariable Transmitter
to dynamically compensate and calculate the mass flowrate of superheated
steam through a standard 304 SS orifice meter with flange taps. The
engineer has sized the orifice meter to produce a differential pressure of
241.3 inches H2O at 22,345 lb/hr. The flowing pressure is 64.73 psia and
the flowing temperature is 350 degrees F.
The steps in Table C-5 shows how to configure the SMV to calculate the
PV4 flow variable for this application.
Continued on Next page