. The street railway review . e tiry vacuum system would beIho same for either style of condenser hut if a surface condenser were used there should lie two of these pumps to insure continuousoperation. A surface condenser accumulates air until the vacuum islost but an elcvateil jet condenser will discharge a large portion ofthe air due to the great i|uanlity of downward flowing cooling waterbeing miiiglcfl with the air. An elevatc<l jet condenser will ordi-narily drop its vacuum about 4 in when running without the dryvacuum pump, in fact the syphon type elevated jet condenser is in-stalled
. The street railway review . e tiry vacuum system would beIho same for either style of condenser hut if a surface condenser were used there should lie two of these pumps to insure continuousoperation. A surface condenser accumulates air until the vacuum islost but an elcvateil jet condenser will discharge a large portion ofthe air due to the great i|uanlity of downward flowing cooling waterbeing miiiglcfl with the air. An elevatc<l jet condenser will ordi-narily drop its vacuum about 4 in when running without the dryvacuum pump, in fact the syphon type elevated jet condenser is in-stalled without ail air pump operating at a slightly lower vacuumFig. 27 shows the two condensers pipeil to an air pump and havingthe valves placed as closely as possible to the pump in order thai thenumber of joints and fillings bclwcen the shut-ofT valves and thepump may be reduced. To make repairs between the valves andpump necessitates shutting down the pump but any other repairs canbe made and one condenser still be in operation. ArtO ^IH TO PUtnP Z) no. 29 Ibr air cooler drains back into the tail pipe or hot well, the in-jection water passing through the cooler on its way to the air pump is shown discharging over the hot well hut may dis-charge over a sewer catch basin as there is no appreciable vaporAnother method is to discharge Ihe air into the tail-pipe shown inthe dotted lines. The advantage of this arrangement is that airshowing, say 26 in. vacuum. Is taken from the condenser bowl anddischarged into the tail-pipe where it would show but 20 in. ofvacuum, thus instead of compressing 7 cu. ft. to i cu. ft. as wouldbe the case if exhausting to atmospheric pressure, it is necessary tocompress but 2<; cu. ft. to I cu. ft This arrangement would notpermit raising the vacuum on the condenser and the atmosphericvent would require being used until the vacuum is on the condenserand the water flowing through the injector shaped air discharge in
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
