. Il giornale ferroviario di strada . 8, 1903. Durante questo periodo, il motore ha funzionato, senza fermarsi, 1157 ore, ed è stato poi arrestato per riparare una cinghia rotta. In una stazione di pompaggio situata su Allegheny, a breve distanza da Pittsburg, cinque motori da 85 cv dello stesso tipo di velocità di trasmissione a pieno carico durante la settimana senza fermarsi, tranne la domenica, quando le unità sono chiuse in rotazione per l'ispezione e la riparazione. Ciascun motore funziona dal 96 al 98% del tempo trascorso. Non è necessario affermare che tale servizio non sarebbe richiesto nelle stazioni centrali, in quanto dovrebbe essere disponibile la capacità di riserva
1926 x 1297 px | 32,6 x 22 cm | 12,8 x 8,6 inches | 150dpi
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. The Street railway journal . 8, 1903. During this period the engine ran, without stopping, 1157hours, and was then shut down to repair a broken belt. In a pumping station located on the Allegheny, a short dis-tance from Pittsburg, five 85-hp engines of the same type ope-rate regularly at full load through the week without stopping, except on Sunday, when the units are shut down in rotation forinspection and repair. Each engine operates from 96 to 98 percent of elapsed time. It is needless to state that such servicewould not be required in central stations, as reserve capacityshould be available for use during peak loads. In the presentexhibit, the majority of the plants operate from 18 to 22 hoursper day, giving ample time for inspection and repair, even ifno reserve capacity were provided. m .0 s. S => 80 t ™ o 60 16000 5014000 4012000 3010000 208000 106000 0 u. 3 S 18 600016 500014 400012 300010 20008 10CO c 0 EFFICIENCY TEST-OF A 550 8 H P FOUR CYCLE GAS ENGINE25 x 30 3 CYLINDER VERTICAL SINGLE ACTING TYPE. 303 400Load Horse Power FIG. 1.—RESULTS OF EFFICIENCY TEST OF 550-HP GAS ENGINE The skill required for operating a gas plant is apparently nogreater than for steam plant. In several instances where thelatter have been replaced, the old employees have been retained.In newly-established plants steam engineers have invariablytaken charge after short preliminary instruction from thebuilders erecting engineer. In plant No. 11, weekly inspection of bearings, igniters andvalves were at first carried out. This was found to be unneces-sarily frequent, and is now done once a month. The cylindersare inspected occasionally throughout the year. This plant, 800-hp capacity, is operated by three day men and one nightman, ten hours to a shift. In cost, the gas-engine equipment is quite comparable withthat of a steam plant. The engine itself costs more than asteam engine of corresponding size, on account of the increasein metal required by the higher pressures dealt wit
