into the boats so that when the technologyis available we can take off thestacks and pull out the silencers, andinstall the new equipment that willget us to Tier III and eventually toTier IV,” said Schlueter.The vessels are double-hulledand designed to prevent overboarddischarges of fuel or fluids. They willbe DP-1 and FiFi-1, as is becomingexpected in the oil field service market.Intercon, based in Kansas City,Mo., still manufactures its winchesand couplers in the heartland. Thecompany has a long and solid relationshipwith Crowley, and is buildinga whole new winch system forthese four tugs. Although based ontheir 600-hp, hydraulic, DW275Hdouble-drum waterfall winch, somedramatic modifications are beingmade, not the least of which isreversing the drums in order to lowerthe vessel’s center of gravity.The winch weighs <strong>11</strong>4 tons with4,200 feet of 2.75-inch wire on thetowing drum, typically the upperdrum, and 3,000 feet of 2.25-inchwire on the second drum, typicallythe lower drum. The reverse waterfallwinch flips the weight distribution byplacing the towing drum on the bottom,thereby contributing to a lowercenter of gravity. The reverse waterfallis also under-wound as opposedto over-wound on the standard unit.The result is that the wire runs offthe drum closer to the deck, resultingin a straighter vertical lineupwith the shark jaws and other towinggear. The towing winch has a pullingpower of 500,000 pounds accordingto Intercon.Crowley also chose a waterfall styleof winch rather than a side-by-sidedouble-drum arrangement becausethe wire runs straighter off the drumthrough the shark jaws and towingpins straddling the centerline of theaft deck. With each ship-set, Interconis also supplying an ESW-<strong>12</strong>5D windlassmooring winch and a 21-inchcapstan for the bow. Another modification,intended to keep crewmembersaway from wires under tension,is installation of wheelhouse winchcontrols that also have a touch screeninformation panel.“We take the comfort of the crewvery seriously,” said Schlueter. “Theboat is a home. If we can provide abetter place, they will take a lot moreinterest in the boat and the boat’smaintenance. We try to get the bestpeople so we try to get them the bestboat.” To that end, the engines haveresilient engine soft mounts, the stateroomshave extra padding and eachcrewmember has his own flat screentelevision and Internet access.Crowley expects the new vesselswill establish them as industryleaders for many years, keeping thecompany competitive as much as itsInvader class has for several generations.“They were our signature boatsfor years. So we’re looking to theOcean class to be our signature boatfor the next 30 years. We’re going tobe proud of these boats 30 years fromnow,” said Schlueter. •HIGH-PERFORMANCE TUG SOLUTIONS | RIVER/BARGE LINES | EMERGENCY TOW LINES | LOCK LINESSamson’s Ultimate Towing SystemABRASION HAS MET ITS MATCHSAMSON’S SYSTEMATIC APPROACH PROVIDES YOU WITHTHE ULTIMATE IN PERFORMANCE AND VALUESATURN-<strong>12</strong> MAINLINE: Samson’s newest rope made with Dyneema ® and enhancedwith Samson’s proprietary abrasion-resistant coating> substantially reduces internal and external abrasion> increases residual strength by 20%> extends service lifeQUANTUM-<strong>12</strong> BACKER LINE: One of Samson’s patented DPX technology products> high coefficient of friction for good gripas it wraps on the winchDYNALENE CHAFE GEAR: Made with 100% Dyneema ® fiber> added protection from abrasion on areas of high contact> very light weight> easy inspection without removal> excellent durabilityVisit SamsonRope.com for more information.Dyneema ® is a registered trademark of Royal DSM N.V.Dyneema is DSM’s high-performance polyethylene product.16smith|walkerDESIGN&PHOTOGRAPHYAmerican Tugboat Review 20<strong>11</strong>client: SAMSONproject: 1/2-page Horizontal Adjob number: 107948date/proof: 5/23/<strong>11</strong> FINAL
Insist on Tufl ex RubberFlooring for Your Fleet• Superior sound dampening• Unparalleled durability• Ease of installation and maintenance• Slip resistant and nonporous• Cushioned support under foot• Also proudly offering IMO Certifi ed productsTufl ex Rubber Products, LLCSports & Marine DivisionWorld Trade Center Tampa Bay<strong>11</strong>01 Channelside Drive, Suite 244, Tampa, Florida 33602 U.S.A.T: 800.770.6008 | E: marine@tufl ex.com
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