. The Street railway journal . 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
. The Street railway journal . 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. .vin ioto 2100 2500 3001) FIG. 4.—LOAD-WATER RATE CURVE FOR A 2250-KVV TURBINEOPERATING AT 160 LBS. PRESSURE WITH 150 AND 28-IN. VACUUM ing under the same conditions. These curves illustrate thevalue of the high overload efficiency of the turbine and itshould be noted that 50 per cent overload on the enginewith equal work in the cylinders requires 43 per centmore steam than the turbine for the same purpose. Thisconstruction, of course, is of great importance in connec-tion with the peak capacity of the station with a givenequipment of the boilers and auxiliaries and also shows thatthe change to turbines effects improvement on the normaloperating economy. The high overload efficiency of this turbine is shown toa marked degree in Figs. 3 and 4; Fig. 3 showing the re-sults on a 2250-kw machine made in April, 1907, and the result of tests on a 1000-kw machine made in May, 1907. Both of these tests were conducted at Schenectady.— ..>#.. TWIN CITY RAPID TRAN
Size: 2799px × 893px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
