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Title: Sonic Nozzles
Author: Giles m. Crabtree
Source: 1978 International School of Hydrocarbon Measurement
Year Published: 1978
Abstract: Recently, it has become evident that some form of secondary flow standard was required for work with natural gas flow meLeis, binuu gati meter development was being extended into areas of high flow rates and hiqh pressures. 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. The new standard would have to be permanent, reasonably compact and capable of readily beiny correlated with other standards, such as volumetric provers and qravimetric devices. Any calculations required should be kept as simple as possible, since field use was intended.

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