Railway and Locomotive Engineering . valve in a repair room, or in clean-ing them at all if they are properlylubricated when accurately repaired andplaced in service. In many instances itwould be the most economical policy toremove a triple valve from a car andreturn it to the manufacturers withoutever looking at the inside of it. becauseas previously stated if the valve will notgive two or three years service withoutany attention something else besides thetriple valve requires attention. Cost of Operating Air have recently received inquiriesconcerning the comparative cost of op
Railway and Locomotive Engineering . valve in a repair room, or in clean-ing them at all if they are properlylubricated when accurately repaired andplaced in service. In many instances itwould be the most economical policy toremove a triple valve from a car andreturn it to the manufacturers withoutever looking at the inside of it. becauseas previously stated if the valve will notgive two or three years service withoutany attention something else besides thetriple valve requires attention. Cost of Operating Air have recently received inquiriesconcerning the comparative cost of operat-ing the 9^ and 11 and 84 ins. CrossCompound air compressors, and thesequestions were relative to the comparativecoal consumption under what was statedas average conditions, and the averagecondition would be something exceedingly compressor consumes approximately 68lbs. of steam per 100 cubic feet of free fluctuate around .00015 cents per car mile,or 15 cents per thousand car miles. Onone particular road, the total car 70 80 DELIVERY OF CU. FT. FREE AIR PER MINUTECOMP.\RATIVE STEAM AND COAL CURVES. For various rates of air delivery oi the 11 x 11 x 12 and the 8J4 C. C. comprts^urs at185 lb. steam pressure and 110 lb. air pressure. Compressor speed controlled by lU governorset at 110 lbs. Coal required computed on the basis of 7 pounds of water evaporated per poundof coal and 1,000 hours continuous service. ... , ,„ , , i o,/.> Example: At 50 cu. ft. free air per minute 11 compressor uses 129 tons of coal and SV,C. C. compressor uses of coal. 129 52 = tons //129 .60 or 60% air delivered, while the 11-in. compressor65 lbs. and the 8i-in. cross compound 24lbs. per hundred cubic feet of free airdelivered. From estimates that have been madedifficult to determine. There is a wide covering the actual cost of operation of variation among the different railroadsV to steam and air pressures employedas well as the length of trains, amountof leakage from the b
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