DERIVATION OF ORIFICE EQUATIONS REEVALUATED
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Orifice meters are in widespread use as economical flow measurement devices. The gas industry used them routinely for custody transfer of billions of dollars worth of gas and liquefied products. Yet, some confusion exists in application and interpretation of the orifice equations to calculate flowrates. Current (and future) product values provide a driving force to remove this confusion. The objective of this work is to present the results of a derivation which retains a maximum of rigor and clearly labels each assumption. The most significant conclusions relate to use of the supercompressibility factor, the gas gravity, and the expression for mass flowrate.
author list (cited authors)
HALL, K. R., EUBANK, P. T., & HOLSTE, J. C.