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Title: Test Instruments And Recorders For Specific Gravity, Water Vapor And Supercompressibility
Author: A. W. Chandler
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: Volume measurement of natural gas at high pressure is principally accomplished by means of orifice flow meters. Converting orifice meter readings to low pressure volumes requires the information furnished by instruments described in this paper. Orifice meter computation of natural gas flow is made by using the formula Qb C x /HwPr where Qb is the quantity, Hw is the differential, and Pr the static pressure, with C being a constant. This constant C is only a constant for a certain specified set of conditions, and in practice is made up of numerous factors including the basic orifice factor, the Reynolds number factor, the expansion factor, the pressure base factor, temperature base factor, flowing temperature factor, specific gravity factor, supercompressibility factor, and manometer factor. In order to determine these factors, the values of the quantities from which they are derived must be either assumed or measured. This paper will deal with those instruments mea.suring pressure, specific gravity and supercompressibility. (For further details refer to AGA Gas Measurement Report No. 3.)

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