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Title: Design And Operation Of Rotary And Turbine Meter Installations
Author: John J. Janicki
Source: 1984 Appalachian Gas Measurement Short Course
Year Published: 1984
Abstract: The first rotary meters were developed in the early 1920s and have been used as a gas measuring device for many years. A rotary meter is classified as a positive displacement meter since it measures volume by alternately filling and emptying measuring chambers of constant volume in a repeating process. There are two basic rotary design types in use today, the first being the original impeller type as shown in Figure 1, which consists of two figure 8 contour impellers rotating in opposite directions, providing four separate gas volumes per revolution. The second is the rotating vane meter as shown in Figures 2 and 3, Depending on the manufacturers design, these meters consist of a number of equally spaced vanes rotating around a stationary member passing through a rotating gate which allows the vanes to pass back from the inlet to the outlet side of the meter and preventing the gas from bypassing the measuring chambers. The total displacement of these meters equals the amount of gas trapped between the vanes and released downstream during one revolution. Rotary meters are available in digital counter registrations and instrument drive output shafts.

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