. Transactions . se to theactual average. Fig. 2 is a diagram of the piping of a blast-furnace, constructedin 1880. The upper part is the plan, and below is the correspondingelevation. A, A, are the hot-blast stoves ; B is the furnace ; C, thechimney ; D, gas-flue; E, cold-main, 4 feet in diameter, 78 feetlong ; Er, cold-main, 2\ feet in diameter, 72 feet long; F, hot-main,17 inches in diameter, with one 45° bend; G, bustle-pipe ; H, flueto chimney; J, J, blowing engines; K, down-pipe, feet indiameter, 14 feet long, with bend on bottom; L, tuyere-pipe; N,hot-blast valve, 17 inches in diam
. Transactions . se to theactual average. Fig. 2 is a diagram of the piping of a blast-furnace, constructedin 1880. The upper part is the plan, and below is the correspondingelevation. A, A, are the hot-blast stoves ; B is the furnace ; C, thechimney ; D, gas-flue; E, cold-main, 4 feet in diameter, 78 feetlong ; Er, cold-main, 2\ feet in diameter, 72 feet long; F, hot-main,17 inches in diameter, with one 45° bend; G, bustle-pipe ; H, flueto chimney; J, J, blowing engines; K, down-pipe, feet indiameter, 14 feet long, with bend on bottom; L, tuyere-pipe; N,hot-blast valve, 17 inches in diameter, containing two right-anglebends. From stove Al, hot-main and hot-blast valve have a total lengthto bustle-pipe of 26 feet. From the bustle-pipe to the nearest tuyere 152 THE FLOW OF AIR AND OTHER GASES. is 4 feet, and half-bend from hot-main ; diameter, 17 inches. Thereare seven tuyere-pipes, 8 inches in diameter, 7 feet long. Theengines are nominally blowing 13,000 feet of blast per minute. This CI 6 Mp5i. we reduce by 10 per cent, for the waste of the engines, making thevolume per second 195 feet. The observed pressures and tempera-tures are as follows: THE FLOW OF AIR AND OTHER GASES. 153 Pressure in engine-house, Pressure leaving stove, Pressure in bustle-pipe, Pressure in tuyere-pipe at eyesight, Temperature of cold-main, Temperature of hot-main, Weight of air in cold-main, per cubic foot, Weight of air in hot-main, per cubic foot, lbs per sq. lbs. per sq. lbs. per sq. lbs. per sq. ° ° lb. Multiplying the volume per second of atmospheric air passedthrough the engine by , its weight per cubic foot, and dividingby , we have the actual volume passing per second throughmain E: 195 X -4- = 163 cubic feet per second ; andthis divided by area of pipe = 13, the velocity in feet persecond. .tor the 4-foot section E, h = ^-r-r ( ; V 1 ) = loss of head. For the 2J-foot section, Er, the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
