. Electric railway review . the steam would have avolume 1,(100 times that of water it would require but onefour-hundredth of the steam necessary for heating to atomizethe condensation, and by lightening the column be able toraise the condensation 10 feet in a vapor column weighingone pound. Since the heating system requires from one totwo per cent of the total steam and the vaporizing steambut one four-hundredth of the amount, it will be noted thatthe steam flow through the drip lines will be an insignificantamount and only sufficient to raise the temperature of thefeedwater a fraction of a d
. Electric railway review . the steam would have avolume 1,(100 times that of water it would require but onefour-hundredth of the steam necessary for heating to atomizethe condensation, and by lightening the column be able toraise the condensation 10 feet in a vapor column weighingone pound. Since the heating system requires from one totwo per cent of the total steam and the vaporizing steambut one four-hundredth of the amount, it will be noted thatthe steam flow through the drip lines will be an insignificantamount and only sufficient to raise the temperature of thefeedwater a fraction of a degree. The drips can thou beleft well open, the drains and the air well cared for, trapsor vapors rising from the sewers avoided and no heatingunits wasted. This system is especially suited for installa-tions requiring other feedwater than for the heating systemalone and where all the exhaust steam is condensed in eitherthe heating system or the heater. The exhaust line to the heating system should he pro- /?l/x//.//?/?/£S. Figure 180—(C20-4). vided with a large grease-extracting separator having eithera water seal or a trap in the discharge to the sewer. If theplant is run non-condensing and the exhaust wasted to theatmosphere, then such steam as would be blown through thedrip system would cause waste due to the lost energy occa-sioned by the back pressure on such an amount as was usedto remove the drips. The amount so used would in regularpractice be considerably greater than that required for theheating system. The system shown in Figure ISO—(C20-4) is applicable tonon-condensing plants such as isolated stations, etc. The aux-iliaries have one exhaust connection to the heating systemand a second exhaust which is free to the atmosphere. Thevalve, a, would be set with say a quarter-pound back pres-sure and the valve, b, with three to five pounds, or what-ever amount is necessary to return the drips. The valve, c,is placed in the heater connection to provide for an exhaust
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
