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Title: Sonic Nozzles For Gas Meter Calibration
Author: Giles m. Crabtree
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: The use of critical flow elements was first introduced into the gas industry about 1930 as field proving apparatus for high pressure displacenent gas meters. These primary devices have basic and fundamental advantages, along with a few disadvantages. The critical flow prover is portable and offers simplicity in the field computations required to obtain the proof of a meter jnder operating conditions. The critical flow orifice prover has long been a convenient and practical method of calibrating neters at high pressure and areas where an elecirical power source is not readily available. low these critical flow provers can be fitted /ith sonic nozzles in place of orifice discs. he use and advantages of the sonic flow nozzle trover, will be discussed in detail.

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