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Title: The Use Of Sonic Nozzles In Gas Meter Calibration
Author: Harry R. Schroyer
Source: American Gas Association 1973
Year Published: 1973
Abstract: This paper gives the background supporting the choice of flow (sonic) nozzles as secondary flow standards for gas meter calibration. It describes why nozzles are useful for this purpose and details a preferred nozzle design. Three typical applications are given. Tests on a 12 inch turbine meter, on rotary meters and on diaphragm meters are described. Several years ago, it became evident that some form of secondary flow standard was required for work with natural gas flow meters. smce meter development was being extended into areas of high flow rates and high pressures. It was felt that the accuracy required in testing these new designs could not be met by using orifice meters or other differential meters and the time-tested, bell-prover standard was not suitable at high pressures.

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