Feature 1 | TUGS AND SALVAGE Handysize tug completes sea trials
Handy One, the first tug of Great Lakes Shipyard’s Handysize class, has now been successfully tested in harsh conditions.
International, owner and charterer of a fleet of Z class tractor tugs. Tese tugs are designed to new Handysize class specifi- cations, and the first of class, Handy One, completed its sea trials in March this year. Testing took place in the icy waters of
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Lake Eire and included speed and endurance trials. Te newbuild exceeded design and manoeuvring expectations, and at full speed the tug was able to stop in its own length. Jensen Maritime Consultants Inc, of
Seattle, designed the vessels, which are intended to fill the niche between the 2400hp to 3200hp tug market, for harbour work, fireboats, construction operations, and coastal towing. Great Lakes Shipyard is building the tugs for sale to the market, however, they are also available for charter through TUGZ. Handy One was due delivery in April
2008 and the next tug, hull number 102, is scheduled for delivery in August 2008. Available as nozzled twin-screw conven-
tional models for those operators whose work application makes the Z drive unneces- sary and too expensive, the tugs are also obtainable with azimuthing stern drives.
Ice class Te design includes features to minimise operating costs and among these is the use of an ABS ice class hull built for icebreaking and sturdiness. Te increased steel thickness and tighter framing in the bow and stern is claimed to ensure an increase in the life of the tugs. Te class is also built to ABS loadline
standards, which means that a loadline certificate is not required and only one licensed operator is required, with other crewing levels leſt to the owner’s discre- tion. Designed for two-man operation with bridge control of the engineroom and deck winches, the tugs are reckoned to have a small environmental footprint and meet or exceed EPA Tier II emissions regulations.
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wo tug hulls have been built by USA-based Great Lakes Shipyard and will be delivered to TUGZ
Sea trials for Handy One, taking place on Lake Eire, Cleveland. Te tugs are 22.6m long, with a moulded
beam of 9.1m, and a maximum draught of 3.3m. Te design attains a bollard pull of 36tonnes, and a free running speed of 12knots is provided from a pair of Cummins QSK 38 diesel engines, each developing 1400hp at 1800rev/min. Te engines turn 1.8m diameter Kaplan
four blade propellers inside stainless steel lined nozzles manufactured by Custom Nozzle Fabricators of Mississippi. Two twin disc MG540 gears have a 5.17:1 ratio with a continuous duty rating of 1557hp. A pair of Onan/Cummins 65kW diesel
generator sets provide the electrical require- ments on each vessel, while the standard 2000gpm fire pump, which feeds a single forward deckhouse-mounted monitor, is driven off one of the generator engines. Additional fire monitors for fighting off-ship fires, as well as a foam capability for a fireboat version, are available as options. Te main engines and gears are cooled by
Duramax Marine Duracooler keel coolers, and the auxiliary engines are cooled by raw water pumps which are engine-mounted through heat exchangers. One Heli-Sep 500 oily water separator is also installed, for use with a 1140litre waste oil storage tank.
Crew and deck specifications Ahead of a well-insulated forward bulkhead are two twin crew bunk cabins and a laundry. On the main deck, a single cabin for the captain with an additional Pullman’s berth is located on the starboard side of the deckhouse aſt of the mess room, and a toilet/shower room is located port side aſt. All the accommodation areas are air conditioned. Tere is a full walk-around bridge deck
with steps up from the main deck, fore and aſt. Te wheelhouse contains 11 windows and three lower windows forward, to provide a 360deg view. Amongst an array of wheelhouse
electronics are two Furuno radar units, one NavTech GPS with chart plotter, a Simrad autopilot, and a Furuno GPS receiver. Te deck has been strengthened to accommodate a range of optional customer requirements, including a forward Jon-Rie Intertech Series 230 hawser winch, a Jon-Rie Series 500 aſt towing winch, and an ESI Marine model T-045M/3S crane. Tese tugs are designed for seven to 10
days endurance for coastal service and the tank capacities include 96,292litres of fuel and 7049litres of potable water. SBI
Ship & Boat International May/June 2008
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