Railway and Locomotive Engineering . claims of gainas high as SO per cent, were made. 78 RAILWAY AND LOCOMOTIVE ENGINEERING. February, 1911. Air BraKe Department Conducted by G. W. Kiehtn Back Pressure on Air Pumps. While considering the subject of airpump piping, a committee appointed bythe Air Brake Association deemed it ad-visable to investigate the amount of back the pump exhaust is piped into atmos-pheric pressure in the engine stack. The reason for questioning the amountof back pressure effective on the exhaustside of the steam piston is that excessive DUPLEX PUMP COV ^LUBRICATOR I. STEA
Railway and Locomotive Engineering . claims of gainas high as SO per cent, were made. 78 RAILWAY AND LOCOMOTIVE ENGINEERING. February, 1911. Air BraKe Department Conducted by G. W. Kiehtn Back Pressure on Air Pumps. While considering the subject of airpump piping, a committee appointed bythe Air Brake Association deemed it ad-visable to investigate the amount of back the pump exhaust is piped into atmos-pheric pressure in the engine stack. The reason for questioning the amountof back pressure effective on the exhaustside of the steam piston is that excessive DUPLEX PUMP COV ^LUBRICATOR I. STEAM VALWC ITM -TO aoiLtB ^1 PrPC STANDARD PRACTICE OFLNSTALLINC PUMPEITHER SIDE OF BOILER WITH T«I5 INSTALLATION THE FOLLOWINGRESULTS WERE OBTAINED FROM TESTSSTEAM MAIN RES STROKES OF BACK PRESS. CU FT OFPRESS. PRESS. PUMP PISTON IN EXHAUST LINE FREE AIR PER MIN G*FROnPUMP PERMIN EOO ISO ITS 10 46 WITH PUMP OPERAJINO WITH RECOMMENDED SPEED(leo SINGLE STROKES PER MIN] THE BACK PRESS IN EXHAUSTPIPESFROMPOMPWILLNOT EXCEED SlbS SHEET N!. FIG. 1. STANDARD PUMP INSTALLATION. pressure encountered in the exhaust pipe,in connection therev^iith. It was found that with 22 ft. of pipe containing one elbow, aback pressure of 10 lbs. per square inchwas effective on the exhaust side of thesteam piston of the 9j^-in. air pump,when the single strokes per minute were175 and 200 lbs. steam pressure workingagainst 120 lbs. air pressure. With the 11 in. pump running at aspeed of 136 single strokes per minute,with 200 lbs. steam pressure workingagainst 130 lbs. air pressure, a back pres-sure of 12 lbs. was encountered. Withthe 8^-in. cross compound pump, pump-ing against 130 lbs. air pressure with 200lbs. steam pressure and a speed of 150single strokes the back pressure in thelow pressure steam cylinder was 20 this time the cross compound pumpwas compressing 130 cu. ft. of free airper minute, and under the conditionsjust mentioned the 11-in. pump was com-pressing 58 cu. ft. of fr
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