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Title: Large Capacity Displacement Gas Meters
Author: Woodford Thomas
Source: 1976 International School of Hydrocarbon Measurement
Year Published: 1976
Abstract: Positive displacement meters are by far the most popular type of gas meter in use today. They have wide spread applications in production, transmission, distribution and industrial gas measurement. Large capacity meters are classified as those capable of measuring more than 500 cubic feet per hour and are frequently referred to as commercial or industrial meters. As the name implies, positive displacement meters are devices that measure volume at line conditions of temperature and pressure. Inferential meters, such as orifice and turbine meters, infer the volume from the differential developed across an orifice plate or the velocity of the gas passing through the meter. The discussion below will deal with two distinct types of positive displacement meters: the diaphragm and the rotary. Both measure volume, but each is based on a different operating pr inciple

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