20th century guide for marine engineers, questions and answers; reciprocating engines, boilers, turbines, gas engines, Diesel engines

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. 1920 Excerpt: ...at upper header. The oil enters the upper flange on the shell, passing through the bundle of tubes, is baffled back and forth across the cooling surface, and finally discharges at lower shell flange. The bundle is removable for cleaning and inspection. The joints of this cooler are all external, and by the arrangement made, using packing and packing rings, no leak can take place from oil to water or vice versa. Moreover, any leak is soon discovered by small tell-tale holes drilled in the packing ring. The cooling water for the oil coolers is supplied by the oilcooler circulating pumps, with emergency connections from the fire main and the main circulating pumps. The pumps draw the water from the sea, force it through the coolers, and thence overboard. The discharged oil from the bearings is returned to the drain tanks which have filling pipes from the oil storage tanks. Fig. 72.--Lubricating Oil Coolers used on U. S. S. New Mexico. 300-KW. Geared Turbine Exciter Units--The direct-current turbine-driven generating units which are used for excitation are designed to conform to the government requirements for this type of apparatus, the turbines being of the single-stage noncondensing type to operate at a speed of 5037 R. P. M. with a steam pressure of 200 lbs. gage and atmospheric exhaust. The generators, which are rated 300-KW., 1000 R. P. M., 120/240 volts, are of the three-wire type, standard design, and are driven by the turbine through a speed-reducing gear. Exciter Turbine.--A section through the turbine is shown in Fig. 73, the general design being in accordance with established practice. The lubricant for the various bearings of the unit is supplied by a geared oil pump which is driven through a worm and gear by the main shaft of the turbine, the uppe...