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Title: Positive Displacement Meters
Author: Howard H. Holmes
Source: 1967 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1967
Abstract: Positive displacement meters are generally classified by capacity and working pressure (or case material). For instance, tinned steelcase meters have working pressures of 5 psig, cast aluminum 100 psig working pressure, gray cast iron 100 psig, and ductile iron up to 1000 psig. Positive displacement meters under 500 CFH capacity are called Domestic Meters, and above this capacity they are referred to as either Commercial or Industrial meters. Domestic meters are normally rated at a capacity sufficient to generate l/2inch water column drop through the meter when measuring 0.64 gravity gas at 60 F and 30 inches mercury barometer. Larger meters are rated at a capacity to cause 2 inches drop at conditions same as above. The basic design for these meters was conceived by Glover in England in the early 1800s, and modern day positive displacement meters are essentially of this design, with liberal use of modem materials and production techniques. Most positive meters are of a type described as having 2 diaphragms, four compartments, and using D slide valves.

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