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Title: Comparison Of Energy Measurement By Volumetric Vs. Mass Procedures
Author: Robinson Ord, Fred Debbrecht, Ron Blohm
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Energy flow computation methods are studied for orifice meters, using chromatographs to estimate heating values and either chromatographs or vibrating element instruments to estimate density and/or relative density. Two alternative methods for determining energy flow are compared - a volumetric method and a mass method. Conditions are: typical natural gas at 200 to 1000 psig (1481 TO 6996 kPa) and 0 to 180 F (-17.8 to 82.2 C). At relatively high levels of inerts (e.g. N2 and C0), the volumetric method yields better results. However, at typical inerts levels, the mass method is preferred. In either case, vibrating element densitometers are shown to have a useful role, especially at higher pressures and in larger pipes.

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