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Title: Liquid Measurement With Orifice Meters
Author: Edgar E. Buxton
Source: 1983 International School of Hydrocarbon Measurement
Year Published: 1983
Abstract: The use of the orifice meter for the measurement of liquid flow at some static pressures and temperatures requires special considerations during the flow measurement system design and operation. The specific static pressure and temperature regions vary with the liquid product being measured. This paper is devoted to explaining the design needs and requirements for orifice meters to attain repeatable and accurate flow measurement of liquids. Flow measurement should not be attempted near the critical point nor near the bubble point (vaporization) of the liquid because large flow measurement errors result from small errors of pressure and temperature measurements. These same thermodynamic properties can cause large errors when using densitometers due to systematic pressure and temperature differences between the orifice meter and the densitometer.

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