. American engineer and railroad journal . ^ in. Fig. II is the log of what may be considered a representativetrip of the locomotive in regular service on the Field Hill, andis chiefly interesting as proving that the boiler is of amplecapacity to supply steam to the cylinders; it also shows thetemperatures and pressures in the high and low pressure steamchests. The maximum temperature shown in the high pressuresteam che^t was 540 degrees, or 153 degrees superheat. Anaverage of a number of trips shows a temperature of 535 de-grees, or 148 degrees of superheat, which is reached soon aftera train
. American engineer and railroad journal . ^ in. Fig. II is the log of what may be considered a representativetrip of the locomotive in regular service on the Field Hill, andis chiefly interesting as proving that the boiler is of amplecapacity to supply steam to the cylinders; it also shows thetemperatures and pressures in the high and low pressure steamchests. The maximum temperature shown in the high pressuresteam che^t was 540 degrees, or 153 degrees superheat. Anaverage of a number of trips shows a temperature of 535 de-grees, or 148 degrees of superheat, which is reached soon aftera train is started and remains practically constant, irrespective Tonnage 1065 E^ 24 loade, 3 empties. , fait, thermometer +Rail, meiiium. flange hard Steam Chest Temperature .i36 Recci«r Pressure Receiver Temperature Speed from Field. ^trfnn FIG. II.—LOG OF STEAM PRESSURES AND TEMPERATURE. Their full rating in summer is 424 tons, and on the samebasis the Mallet locomotive should handle 660 tons, which itdoes without trouble, and has also taken up 700 tons, whichmay be the maximum tonnage for this grade. Dominion coa was used on the tests made at Montreal; thisis a friable, rather fine coal, and an average of the analyses of25 samples gives thf fixed carbon as 55-71% and the heat value13,729 B. T. U. of boiler pressure, cut-off, throttle position, or speed. The maximum temperature shown in the receiver pipe was 350degrees, and the average was about 345 degrees, and as thepressures ranged from 60 lbs. to 75 lbs., this would give from 38degrees to 25 degrees superheat in the receiver. The amount of condensation in the low pressure cylinders isvery small and the cylinder cocks are closed after a few revolu-tions, which, of course, tends to decrease the water consumption. March. 1910. AMERICAN ENGINEER AND
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
