Abstract
At present, gas meters are calibrated under low pressure with standard Bell provers. As the meters can be used under high pressure on the network, the pressure effect upon the error curve must be determined. To avoid this drawback, we have been searching for another standard of gas flow rate at the Gaz de France test station which disposes of a natural gas having steady characteristics and capable of operating at a pressure of 50 bar and a flow rate about 12 000 m3/h (N). This study led us to the working out of a new technique based upon a critical flow meter: the venturi nozzle with a cylindrical throat.
This paper presents:
the results of the sonic nozzles calibration a description of the equipment composed of sonic nozzles to calibrate meters and some examples of the use of this standard of flow rate.
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