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Gas Ships secondary fuel. The Wartsila 50DF Developed from Wiirtsila's very suc- cessful type 46 diesel engines, the Wartsila 50DF engines have cylinder dimensions of 500 mm bore by 580 mm piston stroke. Available in configura- tions with six, eight and nine cylinders in line, and 12, 16 and 18 cylinders Vee- form, the Wartsila 50DF engines devel- op 950 kW per cylinder MCR at 500 or 514 rev/min for 50Hz and 60Hz electric- ity generation respectively. Gas fuel is supplied at a low pressure (less than five bar) to the engines. In gas mode, the Wartsila 50DF engines oper- ate according to the lean-burn Otto process. Gas is admitted into the air inlet channels of the individual cylinders dur- ing the intake stroke to give a lean, pre- 6L50DF mixed air-gas mixture in the engine combustion chambers. Reliable ignition is obtained by injecting a small quantity of diesel oil directly into the combustion chambers as pilot fuel which ignites by compression ignition as in a convention- al diesel engine. The Wartsila 50DF engines use a 'micro-pilot' injection with less than one per cent of the fuel energy being required as liquid fuel at nominal load. Electronic control closely regu- lates the 'micro-pilot' injection system and air-gas ratio to keep each cylinder at its correct operating point between the knock and misfiring limits. Circle 40 on Reader Service Card The preceding was excerpted in part from a paper by Glenn Mattas. Sales, Wartsila Finland Oy and Barend Thijssen, Solutions, Wartsila Corporation. Techcrane Global is your worldwide source for Marine Crane sales, design, manufacture, parts and service. Techcrane Model F250 onboard Torch's 'Midnight Wrangler' Capacities from: 2.5 tons - 200 tons Largest Distributor of EBI Cranes New website: www.techcraneglobal.com (985) 871-0056 y f' Our customers: K-Sea Transportation, Coastal Tug & Barge, Hornbeck Offshore, Great Lakes Dredge & Dock, Maritrans... •L %i 1-4 RAPP HYDEMA U.S. Celebrating OTC—Houston May 3-6 —come visit us at booth 4441! Proud supplier of Towing, Mooring, Oceanographic, Umbilical and other winches NOAA's Oscar Dyson- the first of a new class of FRVs Research & Specialty Winches- this hydrographic is but one of several types aboard the Oscar Dyson mmLi a. wv* Mooring Winches- Our Congratulations to Sause Brothers on recent order. Once again an industry leader has chosen Rapp Hydema Powering all- Rapp's own gearbox drives, great for winches, cranes and more [RAPP MARINE] Towing Winches- Western Towboat's third is under construction, matching recent orders in Europe SEATTLE 4433 27th Avenue W Seattle, WA 98199-1219 (206) 286-8162 office (206) 406-2306 cell Visit us on the web at www.rappmarine.com; e-mail sales@rappus.com Circle 277 on Reader Service Card 48 Circle 298 on Reader Service Card Maritime Reporter & Engineering News
