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Title: A.G.A. Report No. 8 Natural Gas Z-Factor Uncertainty
Author: Jeffrey L. Savidge
Source: 1998 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1998
Abstract: The gas industry is experiencing a number of changes with regards to its gas measurement technology. The changes are the result of years of research efforts by the gas industry through the Gas Research Institute and other organizations. A.G.A., A.RI., G..PA, ISO, and GRIs technical committees have guided the development and implementation of the R&D results through their recommended practices, reports, and standards. One of the research results has been GRIs basic research work on the Compressibility Factors of Natural Gas and Other Related Hydrocarbon Gases. This work is embodied in two industry documents: (1) A.G.A. Report No. 8. and (2) ISO Standard 12213 on Compressions Factors. A.G.A. Report No. 8 has received widespread industry acceptance as both a domestic and international standard. The original goal for this work was to improve the basic equation of state tool used to compute compressibility factors and other important thermophyscial properties of natural gas mixtures. Its utility permeates multiple metering technologies and is used in standards for orifice meters, venturi meters, turbine meters, and ultrasonic meters.

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