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ANNEX B <br /> DEFINITIONS: <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.11For 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 33. 5 <br /> 145 11.6 <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 22 in an inert container. <br />