osg HorizonNewin theDelawarelighteringfleet: OSGHorizonATBThe second of three large articulatedtug-barges (ATBs) built for OverseasShipholding Group (OSG) Americawent to work on the Delaware Riverthis past spring, with a third identicalcombination expected to join itspredecessors next spring.New on the Delaware as of Aprilis OSG Horizon, another in a class ofvessel that is said to be the largest ATBOSG HorizonOwner/Operator: OSG AmericaNew York, N.Y.Builder: VT Halter Marine,Pascagoula, Miss.Designer: Ocean Tug & BargeEngineeringDimensions: 153 x 51 x 26Design/type: Costwise ATB designEnginesu (2) Wärtsilä 9L32dual fuelu 6,050 hp each at750 rpmu Wärtsilä reductiongears 4:1Propulsionu Lips CP propellersu Kort nozzlesOthersPEcificationsu Pilothouse height ofeye: 77 feetu Intercon 64” couplersystemu Cummins auxiliarygenerators (4)u EBI TC 20 telescopicpedestal craneu Accommodations: upto 16 crewTank Capacitiesu Marine HFO:214,000 gallonsu Diesel: 60,500gallonsu Water: 33,000gallonsType & Area ofoPErationu Matched with 655-foot, 342,000-bblbulk liquid bargeu Lightering crude oiltankers in DelawareBayOSG America, New York, N.Y.SPECIFICATIONSCourtesy VT Halter Marineoperating in North America.The tug itself is a <strong>12</strong>,100-hp heavyfuel-burningpowerhouse with 77 feetheight of eye at its massive wheelhouse.Horizon is matched to a 655-foot bargewith capacity of 342,000 barrels of oil. Thetwo are linked together with a couplersystem using 64-inch pins providedby Intercontinental Engineering. It isdescribed as the largest coupler systemproduced by that company.Delivered a year earlier from the VTHalter Marine shipyard in Pascagoula,Miss., was OSG Vision, along with her ownmatching barge, constructed at the sameshipyard. Parts of these vessels were startedat Bender Shipbuilding & Repair beforethat company filed for bankruptcy.OSG Horizon is actually the secondof a series of so-called Costwise tug andbarge designs from Ocean Tug & BargeEngineering of Massachusetts. The cost ofeach combined unit was reported as beingabout $75 million.Each of these tugs is powered by a pairof medium-speed Wärtsilä 9L32 mainengines, rated at 6,050 hp at 750 rpm andturning Lips controllable-pitch propellersmounted in Kort nozzles with independenttriple-shutter rudders. The engines areset up to burn either marine diesel oilor heavy fuel, depending on operatingcircumstances.Electrical power is produced by three250-kW Cummins auxiliary powerOSG Horizon, second in a series ofthree <strong>12</strong>,100-hp ATBs built for OverseasShipholding Group (OSG), is among thelargest ATB tugs operating in the world.Measuring 153 feet in length, the tug isinvolved with lightering crude oil tankerson Delaware Bay.generators with backup provided by a 250-kW emergency generator.These Costwise tugs have tankagefor 214,000 gallons of heavy fuel oil and60,500 gallons of diesel fuel. Power plantsof this caliber are potentially consuming upto 35 tons of fuel per day when operatingat full capacity, according to the designer.Although these first two OSG super-ATBs are seemingly designed for farreachingcapabilities, for the present theyare both earning their keep lighteringcrude oil from supertankers anchored nearthe mouth of the Delaware. From theanchorage, the tugs move the lightered oilupriver to any of a half-dozen refineries.More than a million barrels of crude oilare transported up the Delaware to theserefineries each day, according to regionalshipping reports.OSG, which acquired MaritransOperating Partners in 2006, continuesto be the dominant lightering companyon the Delaware. On a broader scale, thecompany operates a worldwide fleet ofmore than 100 full-size tankers including adozen U.S.-flag tankers. •56 American Tugboat Review 20<strong>11</strong>
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