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WESTINGHOUSE COMPLETE EXPANSION TYPE REVERSING MARINE TURBINE WITH MANEUVERING AND with the Inter-Island company offi- cials. The Matson company has had long experience with the geared turbine form of propulsion, as eight vessels of their fleet are powered with this type of machinery all of which was built by Westinghouse. Incidentally the complete condensing equipment of these eight ships is also of Westing- house manufacture with turbine driven circulating, condensate pumps and air ejectors. The oldest of these vessels is the S. S. Maur, of 10,000 shaft horsepower, and twin screws. The MaAut had a notable war record in the transport service and to date has logged approximately 750,000 miles. The total mileage logged by all eight of the geared turbine vessels, three of which are comparatively recent acquisitions, is over 2,000,000 miles. The S. S. MANULANI and MANUKAI have each logged approximately 300,- 000 miles with a splendid record for economy and reliability over their en- tire period of operation. Turbine Drive Proves Successful Three vessels of the Matson geared turbine fleet are ex-shipping board cargo vessels of the Submarine Boat Corp., 53850 deadweight type, the first of which was purchased from the ship- ping board by the Matson company about two years ago. The operation of this vessel which was named the MANA was so satisfactory that two additional vessels of this type were 26 GOVERNOR VALVES purchased and placed in service, these being the PITTSBURGH BRIDGE and MIL- WAUKEE BRIDGE. These vessels are equipped ._ with Westinghouse 1500 shaft horsepower complete expansion type turbines and condensing equip- ment and with two 2900 square feet Babcock & Wilcox water tube boilers with superheaters. The main turbines of the new Inter- Island vessel will each be of the com- plete expansion type, the arrangement being similar to the turbines on the Submarine Boat type of ships, with the condenser underneath the turbine. The advances in turbine design in the past eight years will be incorporated FORT Pir, Ship - 1g in the design and construction of the new turbines. The turbines for the Inter-Island vessel will be to the most modern design with reliability and best arrangement in the ship given paramount consideration. The turbines will be rated at 2000 shaft horsepower each, and will have a speed of 3600 revolutions per minute. Steam operating conditions will be 265 pounds gage throttle pressure, 75 de- grees superheat and 28.6 inches of vacuum. The main turbines will be of the combined impulse and reaction type with the reversing element lo- cated in the main exhaust chamber and consisting of a two row impulse element. The Westinghouse oil actuated im- peller type emergency over-speed gov- ernor will be fitted. This type of governor is a comparatively recent development utilized now on _ prac- tically all turbines for driving alter- nating or direct current generators and has been fitted in a number of ships where it has proven entirely successful. Latest Design in Geared Turbines The main reduction gears will be of the Westinghouse double reduction, single case, flexible frame type and will have a ratio of 3600 to 135 revo- lutions per minute. In order to ac- commodate the condenser underneath the turbine, the reduction gearing will have its pinions in a vertical plane. The propeller thrust bearings will be of the Kingsbury type mounted on the main gear shaft at the forward end of the gear case. A motor driven worm reduction turning gear will be fitted to the high speed pinion of each gear. There will be two main condensers and one auxiliary condenser. The two main circulating pumps will be driven by auxiliary geared turbines and the condensate pumps by electric motors. ONE OF THREE SUBMARINE BOAT CORP. TYPE OF GEARED TURBINE CARGO SHIPS OPERATED BY MATSON NAVIGATION CO. IN SAN FRANCISCO-HAWAIIAN SERVICE MARINE REVIEW—September, 1927