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Title: Fundamentals Of Orifice Recorders
Author: Kenneth P. Cessac
Source: 1991 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1991
Abstract: This paper wil provide information for use in selecting an orifice recorder. What is an orifice recorder or sometimes referred to as an orifice meter? the term orifice meter is used to mean everyting form th orifice meter gauge recorder to the entire meter station. The American Gas Association defines the orifice meter as the complete measuring unit comprised of primary and secondary elements. The orifice meter tube and connection fittings are considered the primary measuring element. The instruments used to record the variables if the stream flowing through the orifice tube are considered the secondary ekements. Some of the secondary devices used with orifice measurment are differential pressur recorder, static pressure recorder, flowing temperature recorder, and any other required recordings such as specific gravity and heating value. Orifice measurment is based on accurately measuring a pressure drop which occurs when gas is flowing througjh a line passes through a restriction in the line. In order for the same volume of gas to pass througjh the rastriction a pressure drop across the restriction must occur. This pressure drop or differential pressure is proportional to the gas velocity and when combined with other known factors the gas volume can be calculated.

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