. The Street railway journal . the basement for the main flues, twofor the boiler flues on the first floor and two for those on thesecond floor. These openings are all heavily reinforced withplate and angles. The concrete base of the stack is formed and 27>4 ins. vacuum, running at 750 r. p. m. The bearingsof the turbine are supplied with a forced circulation of oil andare also water jacketed. At each end of the cylinder wherethe shaft passes through, a water-seal gland is provided whicheffectively prevents leakage of steam along the shaft. Thereis a large air space surrounding the cylinder
. The Street railway journal . the basement for the main flues, twofor the boiler flues on the first floor and two for those on thesecond floor. These openings are all heavily reinforced withplate and angles. The concrete base of the stack is formed and 27>4 ins. vacuum, running at 750 r. p. m. The bearingsof the turbine are supplied with a forced circulation of oil andare also water jacketed. At each end of the cylinder wherethe shaft passes through, a water-seal gland is provided whicheffectively prevents leakage of steam along the shaft. Thereis a large air space surrounding the cylinder for its entirelength. It is lagged with asbestos, and fitted with an out-side jacket of sheet steel, giving a smooth cylindrical entire structure of the turbine and generator rests on aheavy rectangular bedplate, which in turn rests on the foun-dation, but it is not fastened with anchor bolts. , The length of the turbo-generator unit is 47 ft., width 13ft., and height 14 ft. to the top of gallery railing. By way. FIG. 8.—INTERIOR OF ENGINE ROOM solid with the monolithic building foundation, and is run up3 ft. above the basement floor, which gives an average heightof 245 ft. above the furnaces. The plates composing the stackare of open hearth steel, and are larger than usual, to reducethe number of joints. Above the second opening, no ringis composed of more than four plates, the largest of whichare about 6^^ ft. x 15 ft. The time consumed in the erectionof the four stacks was about three and one-half months. STEAM TURBINESFor the initial equipment three main-generating units havebeen installed, consisting of steam turbines direct connectedto three-phase, ii,ooo-volt generators of the revolving-fieldtype. The turbines are of the Westinghouse-Parsons single-flow type, rated to develop 5500 kw at 175-Ibs. steam pressure. of contrast it may be stated that a four-cylinder piston engineof equal capacity, with its generator, occupies a floor spaceabout 55 ft. long, by
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
