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Title: Mercury Am) Dry Flow Meters
Author: H. J. Terry David Dahl
Source: 1969 Western Gas Measurement Short Course
Year Published: 1969
Abstract: The orifice meter is often mistaJeenly thought of as just a differential pressure gauge. In reality the orifice meter is a combination of the orifice plate, meter run, gauge lines, differential gauge and pressure element This combination forms the orifice meter and enables us to measure the flowing gas The orifice is designed so that the flowing gas is restricted at a specific location in the meter tube by an orifice p5te known as the primary element. The readings above and below the orifice plate are then transmitted by gauge lines to the recorder The pressure difference that is to be recorded is so minute that it is found convenient to relate this pressure to the displacement of water in a 1/2-inch water column. The ratio was found to be one pound differential pressure is equal to 27.7-inches of water displacement in the column. Therefore, the differential pressure being scribed on a chart by the recorder is referred to as inches of water column

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