Document gD0gpO0o99E1Nzg76VYM8BVxV

Hay 27, 19*H Dr, George Callngaert Sthyl Gasoline Corporation 1600 w. Eight Hilo Road Detroit, Mioblgan Dear George* In replying to your request of May 19, for tolerance levels for lead in gasoline to be burned in the \rny stove, we have gone over our figures and arrived at the following. for every milliliter of gasoline burned in the stove, about 1X0 liters of air pass through the equipment. Consequently, when gasoline that contains 3 ml* of T.E.L. per gallon (3.18 gsu of Pb) is burned, the effluent will contain about 0,0 aga* for every 110 liters of effluent. This is equivalent to about Riga* of lead for every 10 cu.m* (cubic meters) of effluent. The usual accepted tolerance level for lead in air is 1.5 ml* per 10 cu.m., this repre senting the approximate volume of air that a man will breathe in an 8-hour day when at work. Omitting for the moment consideration of the fact that some lead is removed in the filter and in the atove^to bring gasoline to a safe lead content prior to combustion, 90 ml. should not contain more than 1.5 rngrn. or approximately 0.0165 ragm. per ml. of gasoline, {0.0620 per gallon). If we assume that the filter and generator tube will remove lead in the same pro portion from gasoline containing small amounts of T.l.L* as It does when 3 mi. per gallon are used, we then might say that 90 of the lead will be removed by the stove and con sequently 11 times the above amount may be considered allow able (approximately 0.68 gm* per gallon). *e have no experimental evidence to indicate that the filter will work just as effectively at low concentrations of lead. We may conclude therefore that if the lead content of gasoline can he reduced to 0.06 &a. per gallon, the unit will be safe even if the filter is not used, and that if the filter works effectively at low concentrations of lead in gasoline, aa much as 0.6 gm. per gallon would be a safe concentration. Kf 0009498 or. George Calingaart - (2) - Hay 27, 19*1 ill of the above calculations are based upon the load contout of the effluent from the stove and do not consider any natural ventilation or admixture with room air. These are probably very extreme conditions and could come about only' in a hermetically sealed room. For praotieel purpose# we could assume with propriety e dilution factor of the effluent of at least 10 to 20 fold under condition# of average ventilation. Because of the high temperature of the effluent gases, ventilation would have to be at least that good for worle to be possible near the stove. j Oordially, : vr wll'lcrcf ttichle, "DT HE 0009490