. Revue électrique de chemin de fer . dans le réservoir supérieur au cas où il devient plein. Le réservoir inférieur peut être utilisé pour l'eau d'alimentation de la chaudière de réserve et doit être beaucoup plus grand que le réservoir supérieur avec l'aspiration vers la pompe afin que l'eau puisse être acheminée vers le circuit d'alimentation du feu, ainsi, en utilisant entièrement l'eau des deux réservoirs et ne nécessitant pas le dupiturenecessaire de faire une structure pour soutenir toute l'eau à l'élévation supérieure. Cependant, si la tour est disposée pour stocker toute l'eau à la haute altitude, alors un chauffage ouvert ne doit pas être utilisé.UN chauffage fermé peut être placé dans la ligne
951 x 2627 px | 8,1 x 22,2 cm | 3,2 x 8,8 inches | 300dpi
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. Electric railway review . in the upper tank in case it becomes toofull. The lower one of the tanks can be used for reserveboiler-feed water and should be made much larger than theupper tank with the suction to the pump so arranged thatwater can be fed to the fire main, thus fully utilizing thewater from both tanks and not requiring the expenditurenecessary to make a structure for supporting all the waterat the higher elevation. However, if the tower is arranged to store all the waterat the high elevation, then an open heater should not be used.A closed heater may be placed either in the line from thetank to the pump or from the pump to the boilers, less pres-sure being placed upon the heater if it is connected betweenthe tanli and the pump. If a closed heater is used the fullamount of head on the feed-pump suction is utilized and thework imposed upon the pump that much reduced. Since theinstallation considered would be non-condensing with a surplusof exhaust steam there should be, as regards heat units trans-. Figure 229- mitted to the water, no perceptible loss if a closed heater Isused, providing, of course, that the heating surface of theheater is ample. Heater Water Supply from Special Pumps. Referring to Figure 225-(Gl-l) it will be noted that aspecial pump is provided for supplying the open heater fromthe hot-well of the jet condenser. If the plant has morethan one condenser and more than one pair of centrifugalpumps it is quite probable that water for the heater will beavailable at all times. If it is necessary to operate non-condensing for a part of the time it will be found advisableto use a separate drive for the heater supply pump andarrange the connections so that this pump can take suctionfrom the intake as well as the hot-well. The independent con-denser pump No. 3 in Figure 228 is so arranged and permitsthe use of the heater at all times, which is a very essentialrequirement. Instead of using a power-driven pump, as shown in Fig-ure 225, the heater
