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Title: Factors Affecting Orifice Accuracy
Author: Reji George
Source: 2004 Appalachian Gas Measurement Short Course
Year Published: 2004
Abstract: Orifice Measurement is a proven method of gas measurement. As an industry, we have been talking about this metering method and problems associated with it for more than seven decades. In 1939, Mr. C. A. Smith (Superintendent of Gas Measurement, West Virginia Gas Corporation, Charleston, West Virginia) speaking at the Second Annual Appalachian Gas Measurement Short Course, said the following about orifice plates: The orifice plate is the main part of the orifice meter, and must not be overlooked. You can have your meter gauges in the best possible working condition, but if an inferior, warped, or dirty plate, or dull edged orifice is used, you can have inaccurate results in gas measurement. That statement still holds true in 2003. This paper will highlight a few maintenance practices that will support good orifice measurement in addition, some errors associated with the primary orifice element will also be discussed.

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