United States Department of Transportation
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Edition:Research Results
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Abstract:The Federal Railroad Administration (FRA) contracted with Jensen Hughes (JH) to conduct research on the feasibility of reducing the size of the test article for floor fire resistance testing. Rail car assemblies manufactured in the United States are currently required to demonstrate (per Title 49 Code of Federal Regulations Part 238) their fire resistance rating which includes structural integrity and limited heat transmission according to ASTM International, ASTM E119 and NFPA 130. According to NFPA 130, the current test requirement is to use a floor assembly test article that is 3.6 m (12 ft.) long and as wide as a rail car (approximately 3 m [10 ft.]). The test article is simply supported along the transverse ends and has an applied total distributed load comprised of live loads (e.g., passenger crush load), dead loads (e.g., equipment, other articles), and other relevant design loads. The NFPA 130 test limits the fire rating determination using the following three parameters: 1. Transmission of heat through the assembly shall not be sufficient to raise the temperature on its unexposed surface more than 139 °C (250 °F) average and 181 °C (325 °F) at a single point. 2. The assembly shall not permit the passage of flame or gases hot enough to ignite cotton waste on the unexposed surface of the assembly. 3. The assembly shall support the representative loading.
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