File:The Street railway journal (1906) (14757594731).jpg

Identifier: streetrailwayjo271906newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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f 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 about 35 ft. wide, and 39 ft. in height. The steam consumption of the turbine is guaranteed by thebuilders not to exceed the following rates when operating at750 r. p. m., with dry saturated steam at the throttle of 175-lbs.gage pressure, with a vacuum of 271^ ins. mercury (referredto a 30-in. barometer) in the exhaust pipe: Rated load, 5500 kw, 15.3 lbs. steam per ehp-hour. Three-quarter load, 4126-kw, 16.1 lbs. steam per ehp-hour. One-half load, 2750 kw. 18.i lbs. steam per ehp-hour. These results will be improved by the following percent-ages, by the use of superheated steam, temperature beingmeasured at the throttle: 100 degs. superheat, 10 per cent. 544 STREET RAILWAY JOURNAL. (Vol. XXVIL No. 14.
Text Appearing After Image:
150 degs. superheat, 12^ per cent.175 degs. superheat, 13% per cent. The turbine is also fitted with an ,-iutomatic safety stop arrangement which shutsoff the steam supply automatically in casethe speed exceeds the predetermined limit.A device is also provided for controlling theaction of the relief valve in the outboardexhaust connection. To maintain perfect alignment of the re-volving part of the turbine, there is provideda special bearing, resembling a thrust bear-ing in construction, but much lighter be-cause of the absence of thrust. This is cap-able of very close adjustment. Convenient to each turbine there is abracket on the boiler room wall carryinga stop valve by which steam supply to eachturbine unit can be cut off in the boilerroom without leaving the engine roomfloor. An iron gallery, fitted with the usualiron ladders and polished hand rails, ex-tends across the tops of the three turbineunits, affording ready access to the admis-sion and by-pass valve. The turbines were bu

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