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Title: Rotary Displacement Gas Meters
Author: F. F. Borgaruds
Source: 1938 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1938
Abstract: rotary as turning around as a wheel on an axis or having parts that turn around and displacement as replacement of one thing by another. This is fundamentally what yon find in the rotary displacement type meter where two rotating parts called impellers replace a definite volume of gas every time they turn around. This type differs from the commonly known displacement type of meter in that the gas pockets, instead of being determined by the capacity of diaphragms or leathers, are determined by machined metal surfaces whose dimensions cannot be changed. These impellers, whose machined shape determines the amount of gas displaced per revolution, are made of cast iron and resemble the Figure Eight in shape. They are mounted on steel shafts supported on anti-friction bearings, one at each end of each shaft and rotate in a horizontal plane in opposite directions at speeds proportional to the volume of gas passing through the meter. The impellers do not touch each other or the cylindrical casing in which they revolve, this being accomplished by accurate machining of the different parts and correct spacing of the impellers with relation to each other by means of a pair of timmg gears located at each end of the shafts supporting the impellers. This whole assembly is mounted on a substantial bedplate with proper pipe connections and is normally set on a substantial concrete or masonry foundation. Pigm-e 1 shows the various parts referred to and their method of assembly.

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