. Principles and practice of plumbing . X -2 = cubic feet of water per minute.—Ans. Actual Performance of House Pump.—The UnionCentral Office Building, Cincinnati, Ohio, is 30 stories pump water to the house tanks located on the 18th and30th floors, there are two Fairbanks-Morse house pumps,size 12 X 7 xl2 and 18 x 7 x 12 inches. Only one is in ser-vice at a time, the other being kept in reserve, and the twoare used on alternate days. An average of 680 cubic feetof water was pumped from the engine room service tankper hour to the tank on the 30th floor, which is about 434feet above
. Principles and practice of plumbing . X -2 = cubic feet of water per minute.—Ans. Actual Performance of House Pump.—The UnionCentral Office Building, Cincinnati, Ohio, is 30 stories pump water to the house tanks located on the 18th and30th floors, there are two Fairbanks-Morse house pumps,size 12 X 7 xl2 and 18 x 7 x 12 inches. Only one is in ser-vice at a time, the other being kept in reserve, and the twoare used on alternate days. An average of 680 cubic feetof water was pumped from the engine room service tankper hour to the tank on the 30th floor, which is about 434feet above the floor of the engine room. Digitized by Microsoft® Principles and Practice of Plumbing 203 The steam required per hour to pump the water was461 pounds, or cubic feet of water pumped with 1pound of steam. The eight-hour test indicated that $0,477in fuel was consumed to maintain and operate the housepump. To pump 1000 gallons of water took poundsof steam, and pounds of coal, making the cost of coal$ OuHet. Big. 101Screw Pump QuiMBY Screw Pump.—Electrically driven centrifugalor rotary pumps are extensively used in connection withdomestic water supplies to raise water to the house type of electrically driven pump is the Quimby ScrewPump, shown in Fig. 101. This type of pump is suitedprincipally to forcing water and not to raise it by suction;hence to operate successfully it should be set at such a levelthat water will flow into it by gravity. When water doesnot flow to the pump by gravity, the suction pipe should bemade short and straight as possible, and should be providedwith a foot valve. The four screws that act as pistons inpropelling the water are mounted in pairs on parallel shaftsand are so arranged that in each pair the thread of onescrew projects to the bottom of the space between thethreads of the opposite screws. The pump cylinder fitsthe perimeters of the threads closely without actual contact,and the faces of the intermeshin
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