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Title: High Precision Real-Time Gas Flow Measurement
Author: David F. Kee
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Gas measurement can now be done in the field continuously, with near laboratory precision. The accuracy of any metering system can be affected by installation effects (jetting, swirl, etc.), by subtle changes in the metering device with time (wear, dirt build-up, etc.), and by changes in gas composition which affect the magnitude of supercompressibility. By incorporating sonic nozzles and other instrumentation for calibrating meters in-situ (in position) and for measuring the supercompressibility directly on-line, an integrated gas measurement system continuously defines a standard cubic metre (foot), traceable to laboratory standards, using digital computers. This paper explains how the sonic velocity correction factor is sensed during volume meter calibration using sonic nozzles and how the real-time supercompressibility is measured, instead of simply resorting to gas analysis and mathematical models that approximate real gas behavior. A description of how to calibrate each element, using laboratory devices to provide certification, is detailed.

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