. Electrical news and engineering. is far greater than any corresponding percentage sav-ing in the power consumption of the same machine. The author sums up the relative advantages in Taljle TI. Pumping Plants Have Equipment Designedfor Flexibility The motor-driven centrifugal pumping plant recentlycompleted at the Riverdale station of the corporation of To-ronto is of interest to municipal and other engineers, owingto the great flexibility of speed and capacity of the unit. Itwas designed to deliver .,000 imperial gallons in 24 hours,against a head of 170 feet, and running at a speed of
. Electrical news and engineering. is far greater than any corresponding percentage sav-ing in the power consumption of the same machine. The author sums up the relative advantages in Taljle TI. Pumping Plants Have Equipment Designedfor Flexibility The motor-driven centrifugal pumping plant recentlycompleted at the Riverdale station of the corporation of To-ronto is of interest to municipal and other engineers, owingto the great flexibility of speed and capacity of the unit. Itwas designed to deliver .,000 imperial gallons in 24 hours,against a head of 170 feet, and running at a speed of 720 ,but owing to probable variation in pressure and capacity thecity required the unit to deliver either ;>, gallons or1,000,000 gallons against a lower head varying from lliO to 70 ft. Single Stage Pump With Variable Speed Motor Under such conditions it is usual to build a multi-stagepump, but the contractors. Canadian AUis-Chalmers, designedand built a single-stage pump which has fulfilled all the guar-. Unil at Riverdale pumping station, Toronto. antees required by the city. The fjsual practice also is tosupply constant speed induction motors for centrifugalpumps, but as the speed to fill the above requirements mustvary from 720 down to 50 , the Canadian GeneralElectric Company built a special 250 variable speedmotor, which also fulfils all the requirements of the city. This pump is single-stage, split casing, specially designedand constructed to obtain the highest efficiency. It consistsof a cast-iron spiral casing with discharge and suction inletcast on to the lower body. The casing is split on a horizon- tal centre line, so as to facilitate inspection without dis-mantling pipe or any other part of the unit. A set of removable diffusion guide vanes has been pro-vided so as to guide the water from the impeller to the cas-ing in the most efficient manner. The impeller is made ofcast bronze, and is polished so as to eliminate unneces
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