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The new vessels fully comply with the American bureau of shipping rules to its highest class and also fully comply with all of the require- ments and recommendations of the international conference of safety of life at sea, although these require- ments have not yet been made man- datory by legislative action on the part of the United States. Over and above these requirements, addi- tional and higher watertight bulk- heads have been fitted in accordance with the recommendations of the construction loan committee of the shipping board, and the navy depart- ment, in order to make these vessels complete two compartment ships. Two Compartment Ships Just what the latter means in the case of an accident is interesting. I'or instance, if the side or bottom of the ship were damaged to such an extent as to cross a main watertight bulkhead, so that the two largest compartments were completely flooded, calculations indicate that the ship would not sink. That is, should two such enormous spaces as the boiler room and engine room, or the great middle hold and the large hold space just forward of that, be floode4d at the same time, the ship would still float. These ships, therefore, more than meet recent ideas on safety. Full requirements of the United States steamboat inspection service for lifesaving and for fire protection, prevention and fire fighting arrange- ments, have, of course, been met in every detail, as have all of the rules of the United States public health service. All of the drinking water tanks are thoroughly sterilized and the ships are rat-proofed throughout, with all the galley and pantry spaces enclosed with steel or steel mesh bulkheads so that rats cannot get through. Everything in the galleys, pantry and storeroom spaces is made of metal or covered with metal. On Nov. 10, 1932, the CoLtomsBra was given a builder’s sea trial off the S. S. Colombia, Single screw turbine geared passenger and freight liner built by the Newport News Shipbuilding & Dry Dock Co. for the Colom- bian Steamship Co. — Sailed on maiden voyage from New York Nov. 24, 1932 Virginia capes, during which speed and economy runs were made be- tween Chesapeake and Winter Quar- ter light vessels, a distance of 67.5 nautical miles. One run was made in each direction at an average speed slightly under 18% knots with the propelling machinery’ developing about 8275 shaft horsepower at 110.6 revolutions per minute, of the pro- peller. The fuel consumption for all purposes was well under the guaran- teed figure of .75 pound per shaft horsepower per hour, with fuel oil at 18,500 B.t.u. per pound. Propulsion is by single screw and the machinery consists of one set of Newport News impulse type turbines comprising one high pressure, one intermediate pressure and one low pressure turbine in series, each driv- ing a separate pinion meshed to a single reduction gear secured to the propeller shaft. Astern elements of impulse type in series are incorpo- rated in the exhaust end of the in- termediate and low pressure tur- bines. The machinery is rated at 6500 Principal Characteristics S. 5. Colombia, 6. 5° Haiti Butlderiiie «a Newport News S. B. & D. D. Co. Owner: 2 os ee ae olombian Steamship Co. Naval Architect 0 1c: eodore E. Ferris Launched, Colombia, Aug. 6,32; Hati, Sept. 17,732 Sailed, Colombia, Nov. 24,’32; Haiti Dec. 22,’32 Length overall, feet, inches.............. 404 5 Length between pp., feet, inches......... 385 0 Beam molded, steet, inches. eens 57 6 Depth molded to upper deck, ft., in......... Sule, Drattisloaded: feet; inches 6. ern ee 2326 Displacement-“tons 0h 9490 Giosstonnare: ee ae mete es cide 5236 Netotonna pec chance ok eens miei ey, 3042 Propelling machinery, single screw, turbine re- duction gears, normal shaft horsepower. .7500 Speed: normal; cknote 2 ace eee 16 Maximum speed on trial, knots............ 18 34 Refrigerated cargo space, cubic feet........ 58,500 Mechanically ventilated cargo space c.f....67,500 General cargo space, cubic feet........... 87,000 Total cargo: capacity, “cubic feet. ..0.. o. 213,000 Puel-oil capacity;seallons (mee 320,000 Fresh water capacity, gallons............ 173,000 Passenger accommodations for. ...4:.... 5.0. 158 Pirstchaes:: eee ae eit eee ae ane 134 F< Vourist:classiirc tte en to es 24 Crews total ss hice eee os oa ee ec ee 95 gOS TSE sake eee 2 MARINE REVIEw—January, 1933 shaft horsepower at 105 revolutions per minute, but is capable of maiu- taining 7500 shaft horsepower at 109 revolutions per minute continuously. Cross connecting pipes and steam and exhaust pipes are so arranged that in an emergency any one turbine if dis- abled can be disconnected and by- passed, leaving two turbines for ahead running and at least one tur- bine for astern. The reduction gearing, as well as the propulsion turbines, were designed and built by the shipbuilder. The three pinions of the single re- duction gear are arranged in the up- per half of the gear case to give ample room for the underslung con- denser. The main gear wheel is about 140 inches in diameter. The quietness with which the gears Oper- ated on trial is due to the accuracy of the gear cutting and the extreme care during erection to obtain per- fect alignment. All turbine rotors were carefully balanced in the build- er’s dynamic balancing machine and given a shop spinning test under steam, at 25 per cent above their de- signed speed, in their own casings, before installation in the ship. Four Watertube Boilers Steam is supplied by four Bab- cock & Wilcox marine type watertube boilers with inter-deck superheater. The working steam pressure is 400 potnds per square inch, and the total steam temperature is 678 degrees Fahr., and 230 degrees superheat. The total evaporating surface in the four boilers is about 17,780 square feet, and the total superheating sur- face is about 2060 square feet. At normal power only three boilers are necessary. Todd oil burners and Diamend soot blowers are fitted. De- superheating coils are fitted in the boiler drums for supplying saturated steam to the reciprocating pumps. Combustion air is supplied by two motor driven B. F. Sturtevant Co. forced draft blowers. The main condenser has a cooling ERR RRR ORE RE