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Sunderland, Peter Moran, Christopher Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Fire Protection Engineering 2008-06-20T05:37:51Z 2008-06-20T05:37:51Z 2008-05-01 http://hdl.handle.net/1903/8194 This study examines flame quenching limits of hydrogen leaks in compression fittings and tube burners. Experimental work is presented. Measurements included ignition limits for leaking compression fittings on tubes of 3.16-12.66 mm in diameter and the ignition and quenching limits of tube burners with diameters of 0.15 - 0.56 mm. Minimum ignition flow rates of 0.028 mg/s for hydrogen, 0.378 mg/s for methane, and 0.336 mg/s for propane were found in the compression fitting experiments. The upstream pressure does not play a role in the ignition flowrate limit. The minimum quenching limits of hydrogen found in tube burners were 2.1 and 3.85 μg/s in oxygen and air, respectively. These correspond to heat release rates of 0.252 and 0.463 W, respectively, the former being the weakest observed flame ever. 1675258 bytes application/pdf en_US Flame Quenching Limits of Hydrogen Leaks Thesis Engineering, General Hydrogen Leaks Quenching Limits Compression Fittings Ignition Limits Weakest Flame open.access