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Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena



John D. Wright, Aaron N. Johnson


Static gravimetric and static volumetric gas flow standards are both affected by uncertainty components related to the measurement of the change of mass of gas within the inventory volume. In the process of diverting gas into the collection vessel, rapid pressure and temperature changes occur in the inventory volume. A low uncertainty gas flow standard requires thorough understanding of these transients so that appropriate instrumentation, system design, and operating procedures may be developed. A thermodynamic model for the flow work phenomena is presented with verifying experimental measurements and strategies for minimizing their effects on flow uncertainty are discussed.
Proceedings Title
10th International Conference on Flow Measurement, FLOMEKO
Conference Dates
June 5-8, 2000
Conference Location
Salvador, BR
Conference Title
Proceedings of FLOMEKO 2000


diverter valves, flow work, gas flow calibration, inventory volume, primary gas flow standard, uncertainty


Wright, J. and Johnson, A. (2000), Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena, 10th International Conference on Flow Measurement, FLOMEKO, Salvador, BR, [online], (Accessed June 24, 2024)


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Created June 1, 2000, Updated February 17, 2017