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Title: Measurement By Orifice Fundamental Principles Of Orifice Meters
Author: Howard J. Evans
Source: 1963 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1963
Abstract: The orifice meter is basically a velocity measuring device based on the principle of conservation of energy. As gas flows through a restriction, its velocity is increased and this increase of kinetic energy must balance out against a decrease in potential energy, An indication of the change in potential energy is the change in static pressure. Mathematically, it can be shown that the pressure drop due to this velocity change is proportional to the square of the velocity or V2 /h

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