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Title: AGA Bulletin #36 And Weaver Interchangeability Methods: Yesterdays Research And Todays Challenges
Author: Rosemarie Halchuk-Harrington, Robert D. Wilson
Source: American Gas Association 2006
Year Published: 2006
Abstract: The increasing demand for natural gas has resulted in the delivery of new gas supplies to the U.S. marketplace, many of which look, and will continue to look, very different than the historical supplies. The natural gas industry has a long and extensive history of appliance testing and mathematical modeling to assess the effect of changing gas supplies on appliance performance, but it is currently challenged to verify the sixty-year old methods for todays gases and appliances and other end-use equipment. This paper reviews the development of the most common models used in the U.S., AGA Bulletin #36 and Weaver, and evaluates the application of the calculations to current natural gas quality issues. Graphs of the calculated results to define a range of acceptable gas quality variability are presented. The results demonstrate potential model limitations related to the disparity between the original and current test gases and burner designs as well as uncertainty about published index limits. Re-examination and enhancement of existing models that reflect current burner designs and gas compositions are recommended so that these valuable tools can be utilized to develop acceptable ranges of gas quality.

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