Transactions . ax. Effi. at Max. Cap. 1 846 214949 1411001 89 1060 j 7. 9 4259 2469 153 1 1 1?. 4 2 [ . j j 2 3 . 1 2 VOL. LXIII. 2S. 434 UNWATERING A MINE BY AIR-LIFT Tables 9 and 10 and Fig. 9 give the results of two tests with thisinstallation. With test No. 1, there was insufficient air to carry the testto the maximum capacity of the discharge pipe. Table 10.—Tests on Air-lift No. 4 Submergence (s) Lift (0 Ratio . Gal. water per min Total cu ft. free air at 7250 cu. ft. free air at sea levelCu. ft. air per gal. (sea l
Transactions . ax. Effi. at Max. Cap. 1 846 214949 1411001 89 1060 j 7. 9 4259 2469 153 1 1 1?. 4 2 [ . j j 2 3 . 1 2 VOL. LXIII. 2S. 434 UNWATERING A MINE BY AIR-LIFT Tables 9 and 10 and Fig. 9 give the results of two tests with thisinstallation. With test No. 1, there was insufficient air to carry the testto the maximum capacity of the discharge pipe. Table 10.—Tests on Air-lift No. 4 Submergence (s) Lift (0 Ratio . Gal. water per min Total cu ft. free air at 7250 cu. ft. free air at sea levelCu. ft. air per gal. (sea level)...Per cent, pumping Velocity water at footpiece Velocity water at discharge Velocity air at footpiece Velocity air at discharge Pressure of air at T^ .. s—subpressure Ratio , Per cent, submergence Velocity mixture at .Velocity mixture at Maximum capacity Cu. ft. air per gal. at max. Sq. ft. of pipe, inside surface Pumping effic. at max. cap. 1 ^,,^.— »i ] ^ .. 4 ^ 4500,400.| J50£ 300 1 ci/ffue QAT£ Lin ? SUB. PERCENTSUB ^^ 1 / 1 ^ / 84b.!) , -^ y V J- J ^ W^ r^ li! \^ / ?- ^ S ISO 100 500 / ^ r y /^ ^ /- ^, / ^y y 600 915 1051 1176 Ii02 l«7 1555 1618 180+ 1919 Z055 1180 ?iOb ?41l Z557 li&l Z808 19Ji 3059 JI64 3310Cubic Feet Free Air Per MinuFe at 85 Percent at Altitude of 7250FF Fig. 9.—Curves based on data of Table 10. S. F. SHAW 435 San Fernando Air-lift Delivery Pipe.—The water delivery pipe consisted ultimately ofa 6-in. nipple 3 ft. long at the footpiece, a reducer, 6 to 5-in., 23 in. long,560 ft. of 5-in. spiral-riveted pipe, a 5-in. nipple 14 in. long below theheadpiece, and a 5-in. nipple 24 in. long inside the headpiece, making atotal length of 568 ft. Air Pipe.—This was 3-in. standard pipe, connected through flexiblejoints to a 3-in. hne 1500 ft. in length. Footpiece.—The footpiece was an Ingersoll-Rand 6-in. Imperial,with air admission for a 13^-in.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
