Clean air program : design guidelines for bus transit systems using hydrogen as an alternative fuel
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1999-04-01
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TRIS Online Accession Number:760813
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OCLC Number:40651924
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Edition:Final report; September 1997-May 1998
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NTL Classification:NTL-PUBLIC TRANSPORTATION-Bus Transportation;NTL-ENERGY AND ENVIRONMENT-Air Quality;NTL-ENERGY AND ENVIRONMENT-Alternative Fuels;
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Abstract:Alternative fuels such as Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG), and alcohol fuels (methanol, and ethanol) are already being used in commercial vehicles and transit buses in revenue service. Hydrogen, which has better air quality characteristics as a vehicle fuel, is being used in research demonstration projects in fuel cell powered buses, as well as in internal combustion engines in automobiles and small trucks. At present, there are no facility guidelines to assist transit agencies contemplating the use of hydrogen as an alternative fuel. This document addresses the various issues involved. Hydrogen fuel properties, potential hazards, fuel replacements for specified levels of bus service, applicable codes and standards, ventilation, and electrical classification are indicated in this document. These guidelines also present various facility and bus design issues that need to be considered by a transit agency to ensure safe operation when using hydrogen as an alternative fuel. Fueling facility, garaging facility, maintenance facility, requirements and safety practices are discussed. Critical fuel related safety issues in the design of the related systems on the bus are also identified. A system safety assessment and hazard resolution process is also presented. This approach may be used to select design strategies which are economical, yet ensure a specific level of safety.
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