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E <br />EXPLOSIVE LIMITS: There is a minimum concentration of flammable vapor in air or oxygen <br />below which propagation of flame does not occur on contact with source of ignition. There is <br />also a maximum proportion of vapor or gas in air above which propagation of flame does not <br />occur. "These boundary line mixtures of vapor or gas in air, which if ignited, will just propagate <br />a flame, are known as the lower and upper explosive or flammable limits." Usually expressed in <br />terms of percent by volume of gas in air. <br />FLAMMABILITY RANGE: The difference between the lower and upper explosive or <br />flammable limits expressed in percent of vapor in air is known as the "flammable range." For <br />example, the lower limits of flammability of gasoline, at ambient temperature, is approximately <br />1.4% vapor in air by volume, while the upper limit is about 7.6%. By difference, the explosive or <br />flammability limit of gasoline is 6.2%.. <br />Maximum Permissable 0., percentages and minimum inert gas concentration for aircraft fuel <br />tanks. <br />TYPE OF FUEL <br />Aviation Gas 115 <br />145 <br />JP 3 <br />JP 4 <br />MAXIMUM 02 <br />11.6 <br />11.4 <br />11.4 <br />MINIMUM CO2 <br />33.5 <br />35.0 <br />34.8 <br />COMBUSTIBLE GAS INDICATORS: Readings from most indicators give the percentage of <br />the lower flammable limit of the vapor in an atmosphere. Readings may be misleading where the <br />atmosphere contains less than 5% by volume of 22 in an inert container. <br />RE: GASOLINE ONLY <br />8/80 <br />