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Title: Basic Construction And Recommended Maintenance For Rotary Meters
Author: Paul F. Giglio
Source: 1981 Appalachian Gas Measurement Short Course
Year Published: 1981
Abstract: The construction of a rotary gas meter consist of an accurately machined rotor mechanism housed inside of an equally accurately constructed meter body. The ability, during the manufacturing process, to maintain the integrity of the meter geometry determines its accuracy, rangeability, capacity, pressure loss and slippage. There are basically two types of rotary meter construction. One type of design employes two opposite rotating impellers contoured in a figure 8 shape. During the rotational cycle of the impellers, a fixed or known volume of gas is trapped between the figure 8 Impellers and the meter housing. This trapped volume of gas is passed from the inlet to the outlet of the meter by the slight pressure differential produced to overcome the mechanical friction of the meter. The relationship between the rotational cycles of the measured volumes of gas and the meter output is transmitted by appropriate gearing to whatever values that are convenient for meter registration. Normally, these values are in increments of 10, 100, or 1000 cubic feet.

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