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HARRY B. WILLIAMS—Tug—Lakes—Single Screw—Turbine oie — : ues DESCRIPTION | The first turbine driven tug to be built in the United States and probably in the world. Also the first geared turbine installa- tion on the _ Great Lakes, anticipating the Ford canalers described elsewhere in this issue. Other unusual features are: (The propelling machinery is the first of its type and gives 30 Name—Harry B. WILLIAMS Owner—Great Lakes Dredge & Dock Co. Builder—Manitowoe Ship Building Corp. Naval Architect—Great Lakes D. & D. Co. Launched—-Mar. 21, ’31; comp., June 3, ‘31 Classification—Owner’s requirements and to meet United States steamboat inspection for ocean service HULL PARTICULARS Length over all, 116 feet 2 inches; length between perpendiculars, 102 feet 6 inches; breadth molded, 26 feet; depth molded, 15 feet; draft, 13 feet 6 inches; displacement loaded, 610 tons; gross tonnage, 263; net tonnage, 104; bunker fuel capacity, in tons, 140, and in gal- lons, 35,000. MACHINERY PARTICULARS Main Engine—One, steam turbine unit with double reduction gears, built by Westinghouse ; Electric & Mfg. Co. A two-stage turbine with 100 per cent astern power; one high pressure ahead, one low pressure ahead, and one low pressure astern. Shaft horsepower, 850; pro- peller revolutions per minute, 125. Turbine revolutions per minute, 6000. Boiler—One, Babcock & Wilcox watertube marine boiler with 3000 square feet of heating surface and 531 square feet of superheating sur- face; working pressure, 320 pounds; 200 de- grees Fahr. superheat; fuel, oil. Superheater, de-superheater and oil burning equipment all supplied by the Babcock & Wilcox Co. Soot Blowers—Diamond Power Specialty Corp. Aux. Gen.— One, Westinghouse turbine set. ony pale ae i a at — oot) rh 100% astern power. AUXILIARY EQUIPMENT Pumps—wWarren, Westinghouse Windlass—American Engineering Co. Steering Engine—American Engineering Co. Refrigeration—Frigidaire Main Condenser—Westinghouse Forced Draft Blower—Westinghouse Feed Water Heater—wWestinghouse Turbine Drive—For circulating and conden- sate pumps; for hydraulic steering gear, Westinghouse Oil Purifier—The Sharples Specialty Co. Towing Machine—American Engineering Co. Steam Gypsey—American Engineering Co. Stern Bearing—B. F. Goodrich Rubber Co. Thrust Bearing—Kingsbury Machine Works In this powerful steel tug, built to full ocean requirements, the Great Lakes Dredge & Dock Co. through its chief engineer and vice presi- dent, A. Neveling has incorporated the most modern developments of marine engineering. Advantage has been taken of recent progress in the propelling unit. By having 100 per cent power astern the usual objection to turbines in this respect has been overcome. To insure readiness for service on short notice, there is an auxiliary steam generator which burns kerosene and provides steam up to 125 pounds which is sufficient to get the main unit quickly into operation. At 285 pounds steam, 200 degrees superheat and 28-inch vacuum, the propelling unit will use 11.9 pounds of steam per horsepower per hour at 850 shaft horsepower. MARINE REvirw—April, 1932 Oe, Se eee TR aE eT Oe RT ee ee TE