. The Street railway journal . Lindley. With steam pressure averaging 95 lbs.,running condensing, and with degs. of superheat, the resultobtained at maximum load was 19 lbs. per kw-hour, or about per ibp-hour. Many other results have been recorded, but those given willprobably be sufficient 10 show that under service conditions theturbine lias demonstrated its high efficiency. But is its efficiency maintained? A question often asked, and avery important one, too. Looking at the turbine casually, itseems riS though there would be little opportunity for any changein its mechanical
. The Street railway journal . Lindley. With steam pressure averaging 95 lbs.,running condensing, and with degs. of superheat, the resultobtained at maximum load was 19 lbs. per kw-hour, or about per ibp-hour. Many other results have been recorded, but those given willprobably be sufficient 10 show that under service conditions theturbine lias demonstrated its high efficiency. But is its efficiency maintained? A question often asked, and avery important one, too. Looking at the turbine casually, itseems riS though there would be little opportunity for any changein its mechanical functions. There is no complicated valve gearto get out of adjustment; no pistons to leak; no rubbing surfacesto set up excessive friction; little chance of misalignment, andaltogether there seems co be no good reason why its original con-dition should ever be very much disturbed. The blades appearto be the vulnerable point, for they do the work, and there are agcod many of them. Their number, though, is in their favor, FIG. 5. —RESULTS OF TESTS ON 400-KW TURBINE It may be pertinent to cite a few results obtained in regularservice. The turbine at Hartford, under test conducted by , at an average load of 1800 kw, with 155 lbs. steam pressure,•27 ins. vacuum and 45 degs. superheat, gave a result of steam per kw-hour, or an equivalent of about lbs. per ihp-hour. An interesting comparison has been made at this plant ofthe relative efficiency under regular operating conditions of theturbine and their Corliss engines. They have one 18-in. and and one 24-in. and 44-in. x 60-in. cross-compound horizon-tal Corliss engine. These engines drive direct by belt one 400-kwand one 600-kw generator. The turbine is, of course, direct-con-nected to its generator. They have made comparisons of oper-ation based in each case on rather extended runs. It has beenfound that the turbine requires in delivering 1900 kw on the boardabout the same amount of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
