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E <br />• <br />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, willjust 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 />-- <br />12W.1313y 16-TATWOMMIM I one . . 9 - I <br />Hrr#=171.1611 7MIFFIMIT. <br />ottlrizt, <br />2&VWkV-- N- <br />mm"11011"t <br />, 'VW1# <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 Permissable02percentages 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 />ff3XV.1Vfl1F= <br />I <br />MINIMUM CO2 <br />'emovial <br />atmosphere contains less than 5% by volume ot'22 in an inert container. <br />I <br />ME <br />