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首页> 美国政府科技报告 >Statistical Determination of Spark Ignition Safety Factors in Methane, Propane, and Ethylene Mixtures in Air
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Statistical Determination of Spark Ignition Safety Factors in Methane, Propane, and Ethylene Mixtures in Air

机译：空气中甲烷，丙烷和乙烯混合物中火花点火安全系数的统计测定

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The Bureau of Mines conducted an investigation to statistically determine the mean current or voltage for resistive, inductive, and capacitive circuits that would cause spark ignitions in 8.3% methane-air, 5.3% propane-air, and 7.8% ethylene-air mixtures. Each mean ignition current or voltage was determined on the basis of 100 trials. For resistive and inductive circuits, spark ignitions were obtained at currents considerably below those in the published curves, but the study was not optimized to find minimum ignition values. The report defines 'safety factor' as applied to intrinsic safety testing as the energy ratio of the mean values of ignition current or voltage for two test gases. The safety factors presented in the report are not constant with voltage or current and, therefore, are not recommended for use.

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