. The Street railway journal . EOPERATING AT 200 LBS. GAGE PRESSURE WITH 125DEGS. SUPERHEAT AND 29-IN. VACUUM stalled in the Fisk Street station of the CommonwealthElectric Company, of Chicago. One of these machines hasbeen tested at different loads by engineers employed for thepurpose by the owners. These tests were part of a generalinvestigation of station conditions which has not yet been /1 ENtQL1 C INE w IT! 1 YUNQER NGINE w(TH in cvun DE R \ 1 U ?B IE 2000 3000 4(100 iOOO IKKW 7000 8000 0000 LOAD IN Street By. Journal FIG. -.—COMPARISON OF A 5000-KW FOUR-CYLINDER COM-POUND ENGINE AN
. The Street railway journal . EOPERATING AT 200 LBS. GAGE PRESSURE WITH 125DEGS. SUPERHEAT AND 29-IN. VACUUM stalled in the Fisk Street station of the CommonwealthElectric Company, of Chicago. One of these machines hasbeen tested at different loads by engineers employed for thepurpose by the owners. These tests were part of a generalinvestigation of station conditions which has not yet been /1 ENtQL1 C INE w IT! 1 YUNQER NGINE w(TH in cvun DE R \ 1 U ?B IE 2000 3000 4(100 iOOO IKKW 7000 8000 0000 LOAD IN Street By. Journal FIG. -.—COMPARISON OF A 5000-KW FOUR-CYLINDER COM-POUND ENGINE AND A 5000-KW TURBINE OPERATINGUNDER THE SAME CONDITIONS published. The following figures give the results of fivetests that were made : TESTS OF yooo-KW TURBINE GENERATING UNIT AT CHICAGO Water Rate, Load in Gape Pressure, Vacuum, Superheat. Pounds per Kilowatts. Pounds. Inches. Degrees F. Kw-Hour. 182 29-43 133 13-15 8,070 179 29-55 116 10,186 176 147 12,108 182 29-34 148 13-05 198 29-31 140 400 000 800 1000 1200 1400 WOO LOAD IN Sr-f r FIG. 3.—LOAD-WATER RATE CURVE FOR A iooo-KW TURBINEOPERATING AT 170 LBS. PRESSURE WITH 170 AND 28-IN. VACUUM A test conducted in Boston, Mass., on Jan. 29, 1907, ona 2000-kw five-stage, 720-r. p. m. machine operating undernormal full-load conditions gave the following results: Load on generator, 5915 kw; steam pressure, lbs.;vacuum, ins.; superheat, 142 degs. F.; steam consump-tion, lbs. per kw-hour. This turbine is mounted on abase condenser which forms part of the unit, and it is be-lieved that this method has much to do with the highvacuum obtained. A third interesting test is shown by the comparisoncurves in Fig. 2 between the 5000-kw machine used in Bos-ton and a 5000-kw compound-engine unit, both units operat-20 [—1—1—1—1—1—1—1—1—1—1—1—1—1—1 1 1—1—1—1—1 1—1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
