Compressed air; theory and computations . ^. Fig. 16. Fig. 17. Art. 43. Data on Operating Air Lifts.—In Figs. 16 and 17 areshown the controlling numerical data of two air lifts at Rolla,Mo. These pumps are perhaps unusual in the combination ofhigh lift and good efficiency. The data may assist in designingother pumps under somewhat similar circumstances. The figures down the left side show the depth from surface. 86 COMPRESSED AIR The lower standing-water surface is maintained while the pumpis in operation; the upper where it is not working. The broken line on the right shows, by its ordinate,
Compressed air; theory and computations . ^. Fig. 16. Fig. 17. Art. 43. Data on Operating Air Lifts.—In Figs. 16 and 17 areshown the controlling numerical data of two air lifts at Rolla,Mo. These pumps are perhaps unusual in the combination ofhigh lift and good efficiency. The data may assist in designingother pumps under somewhat similar circumstances. The figures down the left side show the depth from surface. 86 COMPRESSED AIR The lower standing-water surface is maintained while the pumpis in operation; the upper where it is not working. The broken line on the right shows, by its ordinate, the vary-ing velocities of mixed air and water as it ascends the pipe. The pump, Fig. 16, delivers 120 gal. per minute with a ratio (PAA SIT* 1— = The submergence is 58 per cent, and efficiency net energy in water lift = , = 50 per cent. pv logc r * The pump, Fig. 17, delivers 290 gal. per minute with a ratio 1— = Submergence = 64 per cent, and efficiency = net energy in water Mft 1 = 45 per cent. pv loge r The volumes of ai
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