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Title: History And Status Of A.G.A, Report Number 8
Author: Jerry Paul Smith
Source: American Gas Association 1990
Year Published: 1990
Abstract: The first ideas to modify or expand the supercompressibility factors in the PAR Research Project NX-19 were conceived in 1977 or 1978. At that time, the Transmission Measurement Committee had requested and the American Gas Association (A.G.A.) had granted funding in 1978 for revisions to NX-19. Three thousand dollars was approved to engage Professor R. H. Zimmerman of Ohio State University to write an equation to calculate Fpv using NX-19 methods at an absolute zero pressure base rather than the 14.7 psia pressure base used in NX-19. Because of Professor Zimmermans busy schedule, very little, if any, work had been done even into 1979. By this time, there was growing evidence that there was a need for supercompressibility factors over a larger range of temperatures and pressures than those covered by NX-19. Also, there was a need to include higher concentrations of carbon dioxide and nitrogen plus other nonstandard gas components such as hydrogen, hydrogen sulfide, and water vapor. With these requirements, the contract with Professor Zimmerman was canceled, and the scope of the project was expanded. It would require much more work than the original project, and funding had to be secured.

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