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Title: On The Difference Between Us Example Supply Gases, European Limit Gases, And Their Respective Interchangeability Indices
Author: C. J. Ennis, K. K. Botros, D. Engler
Source: American Gas Association 2009
Year Published: 2009
Abstract: Several gas interchangeability methods exist which describe a set of parameters and limit values to aid in determining the viability of using a gas composition different than the original adjustment gas. Numerous empirical and diagrammatic methods have been developed and are under further development both in the US (e.g. AGA Bulletin #36 and Weaver Indices) and in Europe (diagrammatic methods). In North America gas appliance performance testing is specified by ANSI/CSA standards. These standards were harmonized between the United States and Canada after the signing of the North America Free Trade Agreement, January 2, 1988. Similarly, the EN-437 standard in Europe defines a set of test gases and pressures to be used when testing appliances for compliance with the Gas Appliance Directive. In an attempt to determine the performance of modern gas appliances and to ensure that they are in compliance with respect to gas interchangeability issues, the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) and the American Gas Association (AGA) have undertaken a study of five distinct gas mixtures for the purpose of testing appliance performance. This paper provides a comparative analysis between these two sets of test gases to aid in the understanding of the gas interchangeability issues relative to the two continents. The approach used in this comparison is through the application of the different methods and techniques for gas interchangeability (indices and diagrammatic) in an attempt to map out any parity/disparity between these two sets of test gases and associated standards. In particular, in the present analysis the utilization curve developed by Halchuk-Harrington was used along with three European diagrammatic methods, namely: Delbourg, Gilbert & Prigg, and Dutton. Applicable indices included: incomplete combustion, flashback, lifting, sooting and yellow tipping.

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