. The Street railway journal . obe produced. Its normal speed is 750 r. p. m.; it has ten polesand is designed for 575 volts. The machine weighs complete190,000 lbs., or 95 lbs. per kw. Its height is 21 ft. and thediameter of the base is 11 ft. 2 ins. The guaranteed steamconsumption in pounds per kw-hour at the switchboard is asfollows: ,0001,5002,0002,500 at 180 lbs. steam pressure, 100 degs. F. superheat and not over2 ins. absolute back pressure in the condenser. The step bear-ing of the turbine will be supplied with water by two steampumps, either of which will be c
. The Street railway journal . obe produced. Its normal speed is 750 r. p. m.; it has ten polesand is designed for 575 volts. The machine weighs complete190,000 lbs., or 95 lbs. per kw. Its height is 21 ft. and thediameter of the base is 11 ft. 2 ins. The guaranteed steamconsumption in pounds per kw-hour at the switchboard is asfollows: ,0001,5002,0002,500 at 180 lbs. steam pressure, 100 degs. F. superheat and not over2 ins. absolute back pressure in the condenser. The step bear-ing of the turbine will be supplied with water by two steampumps, either of which will be capable of delivering gals,per minute at 800 lbs. per sq. in. The other bearings will besupplied with oil by two pumps, each capable of delivering per minute at 35 lbs. pressure. The condensing equipment is of Worthington condenser is of the cylindrical type, having 7000 sq. ft. ofcooling surface. The tube heads are of rolled bronze. A dryvacuum pump of the straight line rotative type is supplied. It. Scale, 1 40 feet PLAN OF WEST SOMERVILLE PLANT is equipped with io-in. x 18-in. steam cylinders and 18-in. x18-in. water cylinders, and a slide valve of the balanced typetor superheated steam. The vapors are drawn from thelowest and coldest point in the condenser, and are handledby the vacuum pump, which is equippeed with positiveinlet and outlet valves, water jacketed air heads and a flashport which connects the two sides of the vacuum piston at theinstant of reversal. This neutralizes the wasteful effects ofthe clearance space, which, at the beginning of the returnstroke, is filled with vapors at approximately the same absolutepressure as that carried in the condenser. In this case, there-fore, a two-stage pump is unnecessary. Tests upon this type ofpump have shown that the condensed steam at the hot well canbe carried within 2 degs. of the temperature corresponding to the absolute pressure of the steam vapor in the condenseras taken from saturate
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
