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Title: Large Capacity Displacement Meters
Author: Howard J. Evans
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: The Large Capacity Displacement Meter is normally used for measuring total consumption of gas to commercial and industrial plants and at small town border stations. In addition, they are quite often used in process work to insure efficiency of operation. Similar to the domestic meter, they will measure accurately from capacity rates down to extremely low flows. The Large Capacity Meter is normally rated on a flow which causes a 2 pressure drop when operating at a pressure of 4 oz. and 0.6 specific gravity gas. When the meters are operated at elevated pressures, the pressure differential is allowed to increase as the operating pressure increases, approaching a maximum value of approximately 6 of water. These meters must be made sturdy enough to withstand not only the higher operating pressures, but also the higher differential pressures. This means that greater care must be taken in the design of bearings, linkages, etc.

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