. The Street railway journal . ght be drawn to the followingpoints in which it differs from others manufactured underthe same iicense. It is arranged with two balance pistons in place of the ordinary design of turbine the three balance pistonsare placed on the high-pressure end of the turbine; in thisit is considered an advantage to dispense with the third andlarge diameter balance piston on the steam end (which isessentially the small diameter end), and to utilize the low-pressure end of the turbine in place of the third balancepiston. For this purpose steam is admitted through thein
. The Street railway journal . ght be drawn to the followingpoints in which it differs from others manufactured underthe same iicense. It is arranged with two balance pistons in place of the ordinary design of turbine the three balance pistonsare placed on the high-pressure end of the turbine; in thisit is considered an advantage to dispense with the third andlarge diameter balance piston on the steam end (which isessentially the small diameter end), and to utilize the low-pressure end of the turbine in place of the third balancepiston. For this purpose steam is admitted through theinterior of the rotor to the low-pressure end, which acts asa third balance piston. This arrangement allows the tur-bine to be made somewhat shorter and enables a moresymmetrical casting to be used in view of the diameter ofthe low-pressure end being reduced. The body of the turbine is built up in three sections in-stead of being cast in one piece. The advantage of thisconstruction lies in the direction of being: able to machine. 2000-KW STEAM TURBINE FOR SYDNEY, NEW SOUTH WALES, AUSTRALIA normal working pressure at the boilers is 150 lbs. per squareinch, while the steam is superheated between the limitsof 85 degs. F. and 145 degs. F. The turbines are arrangedfor a speed of 1500 r. p. m. and exhaust into a vacuum of27^ ins. The complete condensing plant is arranged to maintaina vacuum of 273/ ins. at the normal full load of the tur-bine, and a vacuum of 26 ins. at the overload, the tem- each section to a very much finer limit than would be pos-sible if the complete case had to be machined in one length. The merits of the blading lie first in being able to buildup the blades in half rings ready for assembly in the rotorand casing which permits the blading to be treated as aseparately manufactured article completed and carried instock ready for immediate use. The method of buildingup the blades in sections makes possible the use of the chan- July 6, 1907.] STREET RAILWAY JOURxNAL.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
