Compressed air . 25,000gallons of water per day, drawn from the citymains through a i^-inch pipe under an aver-age pressure of 60 pounds and discharges intoa number of tanks of 1,000 gallons capacityeach. This establishment operates a number ofmachines requiring compressed air under apressure of from 2 to 10 pounds. Compressedair is also used for blowing dust out of a number of electric motors. The illustration shows the compressingdevice in detail. By placing tank A, having acapacity of 1,000 gallons (or 133 cubic feet)over the water tank room, and a second tankP, of 66 cubic feet capacity be
Compressed air . 25,000gallons of water per day, drawn from the citymains through a i^-inch pipe under an aver-age pressure of 60 pounds and discharges intoa number of tanks of 1,000 gallons capacityeach. This establishment operates a number ofmachines requiring compressed air under apressure of from 2 to 10 pounds. Compressedair is also used for blowing dust out of a number of electric motors. The illustration shows the compressingdevice in detail. By placing tank A, having acapacity of 1,000 gallons (or 133 cubic feet)over the water tank room, and a second tankP, of 66 cubic feet capacity below the tank Ain the water tank room and piping them asshown, 3,325 cubic feet of free air will becompressed to about 50 pounds pressure persquare inch (which is more than can beused) without the expense of operating an aircompressor. The operation is as follows: Give the handleof the three-w^ay cock C, a 14 turn, then thewater will flow from the w^ater main to thetank A, until the float valve closes and in turn. discharges the corresponding volume of airthrough the check valve E into the tank gage F will indicate about 2 pounds pres-sure. Then turn the handle of the three-waycock to its original position, when the waterwill flow from the tank A. to the water tankand in turn draw in air through the checkvalve G ready for another filling. In filling the tank A with gallons ofwater 133 cubic feet of free air is compressedin the tank P to about 2 pounds and by gallons of water per day it equals 25fillings or the displacement of 3,325 cubic feetof free air compressed to about 50 poundspressure per square inch deducting necessarylosses. This air is drawn out of the tank P,through a reducing valve H, under the desiredpressure. 4146 COMPRESSED AIR. MUNICIPAL PUMPING PLANTAT DES PLAINES, ILL. J. Francis Small, in Miinicifal Engineering,describes an interesting air lift plant for mu-nicipal water supply. This plant, owing tolocal conditions, made a departure from
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
