Maritime History of the Great Lakes

Marine Review (Cleveland, OH), April 1928, p. 70

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Bedroom of Suite on the Southern Pacific Steamship Dixie in addition by a Sperry gyro pilot control fitted with a Sperry helm angle indicator. A Sperry gyro master compass and repeaters are also fitted. Fire Resisting Materials Used In general the joiner work is on the American colonial: order. All division and passage bulkheads and ceilings are of fire-resisting Vehisote. The inside doors generally are of ma- hogany and the outside wooden doors of teak. The deck covering in the passenger quarters is of tiled lino- leum and in the halls, passageways and public spaces of rubber tile. Man- gansite floor composition is used in the. officers’, petty officers’ glory hole and mess room. Refrigeration is provided by two 6- ton Brunswick-Kroeschell compressors with a complete brine circulating sys- tem throughout the refrigerating boxes. The vessel is heated through- out halls, passageways and_ public spaces by steam, and all staterooms are heated with electro-vapor heaters. A system of hot fresh, hot salt, cold fresh and cold salt water is fitted throughout the bathrooms. All state- rooms are fitted with hot fresh and cold fwesh circulating water. An intercommunicating telephone system is fitted to all staterooms, lounge, library, music room, social hall and smoking room. All light and heat is furnished by two 50-kilowatt and one 75-kilowatt Wide Glass Enclosed Promenade Deck on the S.S. Dixie ) 70 MARINE REVIEW—April, 1928 electric generators driven by De Laval geared turbines. A Lux system of carbon-dioxide fire extinguishing is fitted to‘ protect all cargo compart- ments, boiler room and fuel tanks. Modern Propelling Machinery Propelling machinery for this vessel was built in accordance with the rules of the United States steamboat inspec- tion service and the requirements of the American Bureau of Shipping. The main unit consists of one set of compound turbines driving a single screw through a double reduction gear, and four Babcock & Wilcox small tube type marine watertube boilers fitted with superheaters and air heaters. The turbines consist of one high pressure unit ahead and one low pres- sure unit astern in series, which drive the high speed pinions in connection with the reduction gearing. The low pressure turbine is arranged to ex- haust through the bottom of the cas- ing into the condenser. The condenser is located below the low pressure tur- bine and runs athwartship. The astern turbine in series is arranged in the exhaust ends of both the ahead and astern turbines. The reversing turbine develops two-thirds of full speed ahead power. Turbines are of the De Laval impulse type, specially designed to meet the require- ments of marine service. Working parts are built to limit gages and are strictly interchangeable. Forged monel metal blading is fitted throughout. A progressive feature of the ma- chinery is the comparatively high steam pressure and superheat. The turbines are designed to operate with 350 pounds gage pressure and 200 degrees Fahr. superheat at high pres- sure ahead and astern nozzles. Tur- bine revolutions at normal power are 3250 and the revolutions of propeller at normal power are 91 per minute. The normal shaft horsepower is 7100 with a 10 per cent allowance for maximum. The turbines are designed to operate as near maximum efficiency as possible at all powers above 50 per cent. The high pressure casing is of cast steel and the low pressure casing is of cast iron, both divided along the hori- zontal centerline with the two halves bolted together. Steam chests for both the ahead and reversing elements are cast steel. Wheels are forged steel disks finished all over and de- signed to withstand speeds 75 per cent in excess of the normal operating speeds. The shafts are steel forging tapering from the center, ground on all surfaces, and are designed to have a critical speed of 100 per cent above normal running speed.

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