. Railway mechanical engineer . ly n Rev. gear onlv ,8 C Rev. Rear only 1, 1) All devices 14,750 E All devices 7, F .Ml devices 1, Cost Data—Fig. 5 has been made up from the runningtest data to show the relative cost of maintaining at the minimum, and average conditionsof leakage found during these tests. The first two figuresof this chart show the minimum and average rates of airconsumption-for the three tests in which the reverse gearonly was measured and the three tests in which all auxiliarydevices we
. Railway mechanical engineer . ly n Rev. gear onlv ,8 C Rev. Rear only 1, 1) All devices 14,750 E All devices 7, F .Ml devices 1, Cost Data—Fig. 5 has been made up from the runningtest data to show the relative cost of maintaining at the minimum, and average conditionsof leakage found during these tests. The first two figuresof this chart show the minimum and average rates of airconsumption-for the three tests in which the reverse gearonly was measured and the three tests in which all auxiliarydevices were measured. These values were obtained fromthe test data by dividing the total amount of air used duringthe trip by the total time of the trip in minutes. The actualvalues used are shown in the last column of the precedingtabulation. The remaining figures in Fig. 5 give the relative a^coMpnesson I \ Tl COMI-RESSOn cevEnse ce»b | |/ °ri ;-« comphessoo b; c c compbessoh li ■:■. I I II I 11 CUBIC FEET fnEE AIR PER WINurE. COMPRESSOR COST IN DOLLARS PER TERR (a WORKINO HOURS PER 0*T OR JISO HOURS PER TERR Fig. 5—Cost Data Based on Running Tests of Various Typesof Air Compressors minimum, maximum and average cost for compressed airwhen using various types of air compressors. There are twofigures for each type of compresser, one for the tests madewith reverse gears only, and the other for the tests made withall auxiliary devices. These figures show the relative cost ofsupplying the compressed air required under the various con-ditions, based on the following assumptions: (1) That theaverage working time for locomotives is 6 hr. per day, or2190 hr. per year; (2) That the rate of evaporation is 7lb. of water per pound of coal; (3) That the price of coalon the tender is $ per ton, or $ per 1,000 lb.; (4)That the rate of steam consumption in pounds of steam usedper 100 cu. ft. of free air comjiressed. is in accordance withthe values given in Table II. These values hav
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
