PRINCIPLES OF NAVAL ENGINEERING 



--T--^--— 1 



CROSSOVER 

 PIPE 



PACKING 



TO GLAND I 



EXHAUST< J ^— ■ 



CONDENSER 



■mhbhGland seal 



STEAM 



GLAND LEAK-OFF 



STEAM 



!• 



WEIGHT-LOADED 



REGULATING 



VALVE 



FROM 



AUXILIARY 



EXHAUST 



SYSTEM 



Figure 9-19.— Gland seal and gland exhaust system for propulsion turbines (destroyer). 



38.12 



Following this illustration, let us trace the con- 

 densate and feed system."^ 



The main condenser is the beginning of the 

 condensate system. The main condenser is a 

 heat exchanger in which exhaust steam from the 

 propulsion turbines is condensed as it comes in 

 contact with tubes through which cool sea water 

 is flowing. The condenser is maintained under 

 vacuum. Condensate is pumped from the con- 

 denser to the deaerating feed tank by the con- 

 densate pump. In the deaerating feed tank, the 



The main condenser, the air ejectors, the deaerating 

 feed tank, and other major units in the condensate and 

 feed system are discussed in detail in chapter 13 of 

 this text. The description given in the present chapter 

 is intended merely to provide an overall view of the 

 condensate and feed system. 



water is heated by direct contact with auxiliary 

 exhaust steam and is deaerated; the water (now 

 called feed water) is pumped to the boiler by the 

 main feed pump, with the feed booster pump pro- 

 viding a positive suction for the main feed pump. 



Meanwhile, the air ejectors are being used to 

 remove air and other noncondensable gases from 

 the condenser. Condensate, on its way from the 

 main condenser to the deaerating feed tank, is 

 used in the air ejector condensers and in two 

 other exchangers (the gland exhaust condenser 

 and the vent condenser) to cool and condense the 

 steam from steam— air mixtures and return the 

 resulting water to the feed system. Note that the 

 air ejectors remove air only from the condenser, 

 not from this condensate which passes through 

 the air ejector condensers, the gland exhaust 

 condenser, and the vent condenser. 



Makeup feed water from reserve feed tanks 

 or from a makeup feed tank is brought into the 



218 



