Steam power plants, their design and construction . m. If the cooling water is under pressureno pump is necessary to circulate it through the condenser. Ifnot, a circulating pump is required and this may be driven by thesame steam cylinder that operates the air pump. It is usuallythe practice to place the air and circulating pump and the steamcylinder operating them in line, tandem, beneath the condenser 102 STEAM POWER PLANTS. and on a base supporting the whole. An arrangement of thiskind showing the Wheeler method of mounting a surface con-denser on the cylinders of a Knowles air and circula
Steam power plants, their design and construction . m. If the cooling water is under pressureno pump is necessary to circulate it through the condenser. Ifnot, a circulating pump is required and this may be driven by thesame steam cylinder that operates the air pump. It is usuallythe practice to place the air and circulating pump and the steamcylinder operating them in line, tandem, beneath the condenser 102 STEAM POWER PLANTS. and on a base supporting the whole. An arrangement of thiskind showing the Wheeler method of mounting a surface con-denser on the cylinders of a Knowles air and circulating pumpis shown in Figure 45. Circulating water is sometimes siippUedby centrifugal, pumps driven by an engine or electric motor. Asthe condensed steam does not come in contact with the circulatingwater in the surface condenser, this type can be used when thecirculating water is of such a character that it should not be fedto the boilers. The condensed steam is used over again until itbecomes so impregnated with cylinder oil from the engine that. Figure 45.—Surface Condenser. it has to be replaced by fresh water. The presence of cylinderoil in feed water causes trouble in steam boilers, and it is the fearof this trouble from oil that prevents the wider adoption of thesurface condenser in power plants. However, by providingproper filters of sand, cloth, sponges, excelsior or similar materialfor the feed water and properly looking after them there is noreason why the surface condenser cannot be used with success. The Bulkley siphon condenser, which in a general way is sim-ilar to others of this type, is shown in Figure 46. The steamfrom the engine is led in a pipe to the top of the condenser, which STEAM POWER PLANTS, 103 Mef Valvz. is elevated sufficiently to be placed about 34 feet above the sur-face of a hot well into which the condenser discharges. The in-jection water enters at the side and mingles with the steam atthe lower edge of the cone shown. By contracting the nec
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