Hawaii welcomes the Kapena class


Damen’s Stan Tug concept has found new application in a design moulded to the needs of cargo barge towage around the Hawaiian archipelago


The osana-blt oean-gong tg Kapena Jack Young is the seres opener for onoll-based ong rothers


Te drive train employs two Reintjes


reduction gears, with power translated into propulsive effect by a pair of Fundilusa fixed-pitch propellers in nozzles. A specialised flap rudder system, supplied by the Damen Group, contributes to the requisite high level of manoeuvrability demanded for island operations.


H


onolulu-headquartered Young Brothers, Hawaii’s largest inter-island cargo service provider,


took delivery in August of the first of four new ocean-going tugs built in Louisiana. Te 37.5m Kapena Jack Young (‘kapena’ being Hawaiian for ‘captain’) and her future consorts have been designed by the Damen Group to match the fleet of modern, high-capacity barges deployed on Young Brothers’ route network throughout the archipelago. Te investment in the series of 4,500kW


Kapena-class tugs is intended to enhance the company’s ‘just-in-time’ freight services to island communities, with faster towing speeds, better operating efficiency, reduced emissions and lower maintenance downtime all toted as major benefits. Young Brothers worked with parent firm Foss Maritime, part of the Saltchuk


TECHNICAL PARTICULARS Kapena Jack Young


Length .................................................37.55m (oa) 33.01m (bp)


Breadth, moulded ......................................10.5m Depth, moulded ........................................... 4.8m Gross tonnage .....................................455tonnes Main engines .....................................2 × 2,251kW Speed .......................... 12.5knots (free-running) Bollard pull ......................................... 83.21tonnes Classification society ......................................ABS


The first-n-lass vessel offers nearly m of argo spae are of an etended aft and open de


Ship & Boat International November/December 2018 31


organisation, to research various tug hull designs and engine and towing equipment options. In the event, the Damen Stan 3711 type was favoured, with the construction contract awarded to Conrad Shipyard of Morgan City.


Emission control The tug’s power plant comprises two 8-cylinder diesels of GE Marine’s L250 medium-speed type, distinguished by its ability to meet the stringent EPA Tier 4 and IMO Tier III emission standards without the use of selective catalytic reduction (SCR) equipment and urea-based aſter-treatment. Incorporating an alternative emission control system, exhaust gas recirculation (EGR), each engine delivers 2,251kW at 900rpm, giving a maximum bollard pull of just over 80tonnes and a top speed of 12.5knots.


Proven elements Although more than 200 Damen design vessels had been built and delivered in the US by the time that the Young Brothers contract had been placed in 2016, the project was the first to be handled by the


new Damen USA entity, which


was established in Houston, Texas in the same year. Elements from several proven designs were used in the development of the Stan 3711 model, with an extended aſt and open deck offering nearly 135m2 of cargo space and meeting the specific requirements of the owner and conditions in the Hawaiian archipelago. Besides the four Kapena-class tugs, Young


Brothers’ recent investments have included four new 11,700tonne-capacity barges and a 5,600tonne-capacity ro-ro barge, plus various shore-side equipment. As a publicly regulated carrier, the company provides 12 weekly port calls from Honolulu to the state’s neighbouring island ports, including Hilo, Kawaihae, Kaumalapau, Kaunakakai and Nawiliwili, and also undertakes harbour- assist work. SBI


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