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Title: Displacement Meters
Author: Pack Gregorczyk
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: In North America almost all natural gas is measured by four types of meters: Diaphragm, Rotary, Turbine and Orifice. Diaphragm and Rotary meters are classified as positive displacement meters. They measure gas by alternately filling and emptying measurement chambers of a fixed and known volume. Rotary meters have been in use for over 60 years in the gas industry. The first meters were foot mounted and constructed of cast iron. In the past 20 years the majority of Rotary meters put in service have been constructed of aluminum and are line mounted. The Rotary meters long-term track record of reliability, accuracy and versatility has made it useful in nearly all aspects of gas measurement. Applications for rotary meters include: at the wellhead in gas production and processing, in compressor stations for transmission, and for commercial and industrial distribution measurement.

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