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est technologies with the solid fundamentals of shipbuilding. The choice of the Cummins OSK38-M1400 marine diesel engine Þ ts well as the centerpiece of its propulsion system. The 4 stroke con- tinuous duty diesel with a displacement of 37.9L has an engine base made of components from other Cummins marine engines, including a new cast-iron, ductile single-piece piston with nitride- coated rings and hardened cylinder liner. The fuel system is com- plimented by a Modular Common Rail Fuel System (MCRS) fea- turing a simpliÞ ed design which provides constant high injection pressure regardless of engine speed or load condition. The beneÞ ts to this design include low noise and vibration for quiet operation, idle stability and improved low-end torque. The dry weight of the engine is a maximum 12,015 lbs (5,450 kg). Propellers: Two 72Ó diameter x 75Ó pitch Kaplan-type 4-blade, Rice ÒAqualloyÓ propellers, inside Type 37, stainless steel lined, Kort nozzles manufactured by Custom Nozzle Fabricators. The gearing consists of Two Twin Disc MG540 gears having 5.17:1 ratio with a continuous duty rating of 1557 HP. Air Compressors: One small air compressor for ÒshopÓ service. Engine Cooling: The Main Engines and gears are cooled using Duramax Marine ÒDuracoolerÓ keel coolers. The Auxiliary En- gines are cooled by raw water pumps engine mounted through heat exchangers mounted to the engines. Cooling waterfor the AC unit(s) is supplied from the sea chest crossover. Oily Water Separator: One Heli-Sep Model 500, for use with 300 gallon waste oil storage tank.Off-ship Fire-Þ ghting (OPTION): A single monitor, with a nominal capacity of 2,000 gpm, Þ tted forward for Þ ghting off- ship Þ res was furnished and installed by the Builder. Seawater for the monitor shall be supplied by a dedicated sea water pump driven by at PTO off one of the diesel generators. Aft Towing Winch (OPTION): The Aft Towing Winch is a Jon-Rie Intertech Series 500, with a capacity of 2000-ft of 1 3/4Ódiameter wire that produces a line pull of 70,000 lbs., a line speed of 30 FPM and a brake holding force of 265,000 lbs. Hawser Winch (OPTION): As an Option, Great Lakes Ship- yard offers a Jon-Rie Intertech Series 230, powered using the same HPU as the aft towing winch. The winch has the capacity to spool 450Õ of 7Ó synthetic hawser and will produce a line pull of 28,000 lbs, a line speed of approximately 50 FPM and a brake holding force of 430,000 lbs. Crane (OPTION): As an Option, Great Lakes Shipyard of- fers an ESI Marine Crane Model T-045M/3S, powered using the same HPU as the aft towing winch. In addition, the tug has a low proÞ le pilothouse with 360 de- gree visibility which permits it to maneuver under the sheer of container ships, and in the bow and stern of areas of the vessel. Currently, ÒHandysizeÓ Class harbor tugs are operating and providing harbor service in San Juan, Puerto Rico and San Pedro www.marinelink.com MN November2013 Layout 18-31.indd 23MN November2013 Layout 18-31.indd 2310/28/2013 3:14:20 PM10/28/2013 3:14:20 PM
