"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . independently driven pumps. 21. Utilisation of Heat in Exhaust Steam from AuxiliaryEngines.—A source of very considerable economy in a marine in-stallation being the complete absorption by the feed water of the heatin the exhaust steam from the various auxiliaries, including the steer-ing engine
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . independently driven pumps. 21. Utilisation of Heat in Exhaust Steam from AuxiliaryEngines.—A source of very considerable economy in a marine in-stallation being the complete absorption by the feed water of the heatin the exhaust steam from the various auxiliaries, including the steer-ing engine, electric-light engine and evaporator, such a vacuum shouldbe carried in the main condenser as will enable this to be effected inall seas in which the vessel trades. A vacuum of 2] in. maintainedin the steam space of the condenser, the temperature of the sea being70° Fahr. (barometer 30 in.) has been found to meet these require-ments on an average cargo boat. 22. Cooling Surface.—In determining the amount of coolingsurface per average at sea, provision should be made for therapid initial degrading effect of oil and scale on the tube surfaces, andalso for the permanent prejudicial effect on the condensing efficiencyof the residual air in the condenser. SS. Pump Crosshead and Links,.
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