PRO/II可否查得可燃物质的爆炸上下限? 贴一组手册的数据。 《handbook of fire and explosion protection engineering principles. for oil, gas, chemical and related facilities》 4.3.1 lower explosive limit and upper explosive limit the lower explosive limit (lel) and upper explosive limit (uel) is the range of flammability for a mixture of vapor or gas in air at normal conditions. the terms flammable limits and explosive limits are interchangeable. where the range between the limits is large, the hydrocarbons may be considered relatively more dangerous e.g., hydrogen has a range of 4 percent to 75 percent, while gasoline has a range of 1.4 percent to 7.6 percent, when compared against each other, as it has a higher probability of ignition in any particular situation. flammable limits are not an inherent property of a commodity, but are dependent on the surface to volume ratio and the velocity or direction of the air flow under the test. some common petroleum commodities and their flammable limit under normal conditions are shown in table 4.1, beginning with the widest ranges. table 4.1 common material flammable ranges and spreads material flammable range (%) range spread hydrogen 4.0 to 75.6 71.6 ethane 3.0 to 12.5 9.5 methane 5.0 to 15.0 10.0 propane 2.37 to 9.5 7.1 butane 1.8 to 8.4 6.6 pentane 1.4 to 8.0 6.6 hexane 1.7 to 7.4 5.7 heptane 1.1 to 6.7 5.6 查看更多
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