Engineering and cement world Volume 13

 
9781231329566: Engineering and cement world Volume 13

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...motor-driven, rotary oil pumps equipped with unloading valves. The two governor oil pumps, made by the Lombard Governor Co., have a capacity of 150 g. p. m. and operate against a pressure of 200 lb. per sq. in., each pump being connected by silent-chain transmission to a 25-hp. motor. An air and oil pressure tank, set near each unit, is connected to the governor air main in the basement. Air is supplied at 200 lb. pressure by a 6 by 3 by 7-in. tandem, compound, motor-driven compressor made by Hall Steam Pump Co. Between the air mains and compressor is an air-storage tank, 3 ft. 9 ins. diameter by 9 ft. high. The main unit actuators are the S. Morgan Smith type of oil-pressure relay valve design. The governors have remote control, load-limiting devices, tachometer, gate opening indicator and auxiliary hand pump for governing by hand control; also safety devices to shut down the unit in case governor drive should break. Generators And Accessories. The installations under this head consist of four Westinghouse vertical, revolving field generators, rated at 12,000 kv-a., 6600-volts, 3-phase, 60-cycles, 150-revolutions, 80% power-factor. The order for this and accessory equipment was placed May 9, 1916. Regulation at full speed and under a 12,000-kw. load showed the following: Guaranteed. Shop test. For 80% P. F 35% 23.5% For 100% P. F 20% 14.0% When operated at continuous, normal rating it is guaranteed that the temperature by thermometer will not exceed 50 deg. C. rise above the cooling air, and by thermocouple not to exceed 80 rise above cooling air. Nine thermocouples are placed at the hottest points in the armature for use with potentiometer type indicator mounted on switchboard. Calculated efficiencies show the following:, 100% p. F. v, 80% P. F. v Guarant...

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