Measuring Compensated Liquid via a Turbine Meter
Best Practices
The QRATE Scanner 3300 calculates temperature- and pressure-compensated liquid flow through outputs from a MVT
connected to a turbine meter (or directly from the output from the turbine meter) in accordance with API MPMS Ch. 11.1
and the measurement principles upon which the AGA 7 standard is based. When you supply a linear or multipoint cali
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bration factor, the instrument performs the required compensation calculations based on the RTD and/or pressure inputs.
For optimum performance, ensure that the turbine and MVT installation complies with the industry recommendations
listed below:
•
Install the turbine flowmeter in the meter run such that there are at least 10 nominal diameters of straight pipe
upstream and 5 nominal diameters of straight pipe downstream of the meter. Both inlet and outlet pipe should be of
the same nominal size as the meter.
•
Straightening vanes are recommended for eliminating swirl conditions. If used, they should be installed 5 diameters of
straight pipe upstream of the meter. If a pressure transducer is installed, it is recommended that it be placed upstream
of the flow straightener.
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QRATE Scanner 3300 integrated control flow computer
Section 2
