File:Transactions (1871) (14760984454).jpg

Identifier: transmining14amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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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, 1.33 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
Text Appearing After Image:
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, 4.6 lbs per sq. in.4.1 lbs. per sq. in.3.1 lbs. per sq. in.2.75 lbs. per sq. in.100° F.1240° F.0.091 lb.0.03 lb. Multiplying the volume per second of atmospheric air passedthrough the engine by 0.076, its weight per cubic foot, and dividingby 0.091, we have the actual volume passing per second throughmain E: 195 X 0.076 -4- 0.091 = 163 cubic feet per second ; andthis divided by area of pipe 12.5 = 13, the velocity in feet persecond. .tor the 4-foot section E, h = ^-r-r ( ; 64.4 V 1 ) = 4.09 loss of head. For the 2J-foot section, Er, the area being 4.9 s

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