. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . Fig. 20b.—Section through Turbine Setting and Switch-ing Apparatus in Keokuk Station of Mississippi RiverPower Company 42 HYDROELECTRIC PRACTICE. LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 43 trolled, through exposed operating mechanism, by a governor on the maingenerator-room floor. The main turbine shafts are 25 in. in diameter and21 ft. long. With the rotary alternator field in place, the total revolvingwei
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . Fig. 20b.—Section through Turbine Setting and Switch-ing Apparatus in Keokuk Station of Mississippi RiverPower Company 42 HYDROELECTRIC PRACTICE. LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 43 trolled, through exposed operating mechanism, by a governor on the maingenerator-room floor. The main turbine shafts are 25 in. in diameter and21 ft. long. With the rotary alternator field in place, the total revolvingweight carried is 225 tons. This is carried by a thrust bearing and by twomain-shaft bearings. On the first 10,000 hp. machines installed thestandard combination roller and oil-pressure bearing employed utiUzed oilat 225 lb. pressure, which normally keeps the 225 ton load lifted off therollers. In case of failure of the oil-pressure, of course, the load is trans-ferred to the roller be^rings. Oil is suppHed by gravity to the upper bear-ings, being thence drained to the reservoir under the lower bearings, fromwhich it is pumped to central supply tanks. The type of thrust bearingused requires oil circulation at only atmospheric pressure and introduces alow degree of friction- Each main runner carries 20 buckets and weighs65 tons, w
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