. Railway mechanical engineer . cially for this testand for the routine test under load to which all boosters aresubjected after assembling at the factory of the Poole En-gineering &: Machine Company, Baltimore, Md. The steamplant consists of a 250 hp. Heine boiler with a low tem-perature superheater and a feed water heater connected inparallel with and draining into the main condenser. Thetest bed carries a shaft and IS in. gear, similar to a stand-ard trailer axle gear, direct connected at one end to a pronybrake. The steam pipe from the boiler to the test bed isfitted with a gage to show th
. Railway mechanical engineer . cially for this testand for the routine test under load to which all boosters aresubjected after assembling at the factory of the Poole En-gineering &: Machine Company, Baltimore, Md. The steamplant consists of a 250 hp. Heine boiler with a low tem-perature superheater and a feed water heater connected inparallel with and draining into the main condenser. Thetest bed carries a shaft and IS in. gear, similar to a stand-ard trailer axle gear, direct connected at one end to a pronybrake. The steam pipe from the boiler to the test bed isfitted with a gage to show the inlet pressure and a thermom-eter to indicate the superheat, which ranged between 30 and35 deg. F. in most of the tests. \ second pressure gageis located about 30 ft. back from the inlet gage, the pipingbetween duplicating that on a locomotive. Pressures readon this gage are called throttle pressures in the report andcorrespond to the boiler pressure on a locomotive. The booster was operating on the test plant during four. Fig. 2—Top View of the Booster, with Cover Removed days under a wide variety of conditions ranging from stallingtests to high speed runs at 22 Some of the trials weremade with the exhaust piped to the condenser to measure thesteam consumption and others with the steam dischargingto the atmosphere through 40 ft. of 4 in. pipe to duplicateroughly conditions on the locomotive. The tests representedan equivalent run of about 92 miles as of a 45 in. trailerwheel, most of which was made under hea\} load. During each of the tests the speed and boiler pressurewere held as nearly constant as possible. Indicator cardswere taken and records made of the speed, the brake load,steam pressure and temperature and steam consumption. 562 October. 1922 RAILWAY MECHANICAL ENGINEER 563 From the data thus obtained the details of the performanceof the booster were determined as set forth in the followingparagraphs. Mechanical Efficiency The mechanical efficiency of the b
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
