Steam power plants, their design and construction . ry. This type of con-denser will lift water from asource of supply, such as a tankor reservoir, through a heightof 18 feet or less, but with thisarrangement the siphon must bestarted. This can be done byrunning a horizontal pipe fromthe reservoir or tank across to atee in the vertical discharge pipeof the condenser. Water flowingthrough this and down the dis-charge will gradually exhaustthe air from the upper part ofthe discharge pipe until sufficientvacuum is formed to draw thewater up to the condenser andstart the water flowing throughit. W
Steam power plants, their design and construction . ry. This type of con-denser will lift water from asource of supply, such as a tankor reservoir, through a heightof 18 feet or less, but with thisarrangement the siphon must bestarted. This can be done byrunning a horizontal pipe fromthe reservoir or tank across to atee in the vertical discharge pipeof the condenser. Water flowingthrough this and down the dis-charge will gradually exhaustthe air from the upper part ofthe discharge pipe until sufficientvacuum is formed to draw thewater up to the condenser andstart the water flowing throughit. When this is done a valve inthe cross-connection or starting pipe is closed. Figure 47 shows an elevation of the Worthington central jetcondenser which is a modification of the siphon type. It is calledthe central system because it is often used to condense the steamof more than one engine. An enlarged cross-section of upperpart is shown in Figure 48. The condensing cone is considerablylarger than in other siphon condensers, the idea being that the. Figure 46.—Siphon Condenser. 104 STEAM POWER PLANTS. steam and water are more thoroughly mixed, thus using lesswater. The spray is controlled by an adjustable nozzle. Theneck of the condenser is not contracted, as it is in the ordinarysiphon condenser, to give the high velocity to the descendingwater necessary to suck the air down into the discharge or tailpipe. The contracted neck was avoided to give the water an un-restricted fall so that it could not by any chance back up in thecondenser and run over into the exhaust pipe. To assist in re-moving the air from the condenser cone an air pipe, shown inFigure 48, is led to a dry vacuum pump, which constantly re-moves air from this pipe and very considerably increases thevacuum over what would be obtained without it. The air coolershown in the drawing is used to cool the air while it passes fromthe condenser cone to the vacuum pump, the air passing throughtubes in the cooler around wh
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