A new relationship for orifice flow meter discharge coefficients has been developed which replaces the Reynolds number dependence with the Euler number. Both relationships have the same accuracy for the calculation of the discharge coefficient but the new relationship eliminates the need to know fluid viscosity.

Scott, J. L., Brennan, J. A., and Blakeslee, D. M., 1994, “GRI/NIST Orifice Meter Discharge Coefficient Database, Volume 1,” NIST Standard Reference Database 45, U.S. Department of Commerce, National Institute of Standards and Technology, Gaithersburg, MD.
AGA, ANSI, API, and GPA, 1992, “Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids,” ANSI/API 2530, Third Ed., American Gas Association, Arlington, VA.
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