. Railway mechanical engineer . meswhen the locomotive is moving under steam. The ports are% in. by 1J4 in., with a steam lap of J4 in-- and arelocated at each end of each cylinder at the bottom of thevalve cage or bushing, making four ports in all. CoalOver 70 tests were made to develop the performance ofthe locomotive, and of these tests 39 were fired by hand withrun-of-mine coal. In tlie 1917 tests coal was used,but on account of the difficulty in getting this coal in 1918,the tests were made with Crows Nest coal. These two coalsare from the same region and vein and are alike in ma
. Railway mechanical engineer . meswhen the locomotive is moving under steam. The ports are% in. by 1J4 in., with a steam lap of J4 in-- and arelocated at each end of each cylinder at the bottom of thevalve cage or bushing, making four ports in all. CoalOver 70 tests were made to develop the performance ofthe locomotive, and of these tests 39 were fired by hand withrun-of-mine coal. In tlie 1917 tests coal was used,but on account of the difficulty in getting this coal in 1918,the tests were made with Crows Nest coal. These two coalsare from the same region and vein and are alike in manyrespects. This is further illustrated by the average analyses. 2,000 14,000 I60OOCoal charged to Engines Per Hour. Pounds. Fig. 3. Coal to Engines and Indicated Horsepower per .square inch, was maintained in all of these tests. Themaximum pressure drop, or loss between the boiler andbranch pipe was 18 lb., this drop being at a rate of steamllow of 58,000 llx per hour. The exhaust steam pressure. soo JSOO >0O ISOO 20OO ZSOO 3O00 Indicaf-ed Horsepoiver,Fig. 4. Indicated Horse Power and Coal (Average tor All Cut-offs) shows a maximum of lb. per square inch. Even witha boiler pressure of 250 lb., the maximum superheat temper-ature was deg., which is nearly as high as has beenobtained on any locomotive on the test plant, all of whichhave had a boiler pressure at or below 205 lb. Combustion, Draft and Temperature.—ID. general, the Aprii., 1920 RAn.\\-AV MECHANICAL EXGIXEER 195 draft or vacuum was higher in the lis than in the Lis atall rates of evaporation. This is to be expected, as theexhaust nozzle area was sq. in. for the lis and in. for the Lis. Though not greatly different, the smoke-box temperatures are somewhat higher than in tests of theLis. The feed water temperature was between and The firing was all by hand as the locomotive was notat this time equipped with a stoker. The rate of firingreached 18
Size: 2146px × 1164px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
