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Ll <br />DEFINITIONS: <br />kid <br />1:1 <br />EXPLOSIVE LIMITS: There is a minimum concentration of flammable <br />vapor in air of oxygen below which propagation of flame does not <br />occur on contact with source of ignition. There is also a <br />maximum proportion of vapor or gas in air above which <br />propaghation of flame does not occur. "These boundary line <br />mixtures if vapor or gas in air, which if ignited, will just <br />propagate a flame, are known as the lower and upper explosive or <br />flammable limits." Usually expressed in terms of percent by <br />volume of gas in air. <br />FLAMMABILITY RANGE: The difference between the lower and upper <br />explosive of flammable limits expressed in percent of vapor in <br />air is known as the "flammable range." For example, the lower <br />limits of flammability of gasoline, at ambient temperature, is <br />approximately 1.4% vapor in air by volume, while the upper limit <br />is about 7.6%. By difference, the explosive or flammability <br />limit of gasoline is 6.2% <br />Maximum Permissable 02 percentages and minimum inert gas <br />concentration for aircraft fuel tanks. <br />TYPE OF FUEL MAXIMUM 02 MINIMUM CO2 <br />Aviation Gas 115 <br />145 11.6 33.5 <br />JP3 11.4 35.0 <br />JP4 11.4 34.8 <br />COMBUSTIBLE GAS INDICATORS: Readings from most indicators give <br />the percentage of the lower flammable limit of the vapor in an <br />atmosphere. Readings may be misleading where the atmosphere <br />contains less that 5% by volume of 2 in an inert container. <br />2 <br />11 <br />L <br />