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January 2011 www.sname.org/sname/mt closed-cycle marine sanitation device will process sewage to clean ushing water, eliminating e uent handling diculties. e vessel arrangement re ects the realities of operating a dedicated research vessel in the remote Alaskan arctic regions, where extended cruises can make crew retention dicult. Additional crew habit- ability is a crucial aspect of the design. e majority of the vessel crew is berthed in single staterooms com- bined with shared recreation and messing areas, which allow space for both privacy and interaction. The science accommodations provide berthing in double staterooms to maximize science party size, and are located on a separate deck from the vessel crew to limit noise con icts and eciently accommodate dif- ferent watch rotations and scientic schedules. As the rst vessel design to be reviewed by the American Bureau of Shipping under the new Polar Class Rules developed by the International Association of Classication Societies (IACS), Sikuliaq has been able to incorporate modern advances in structural and mechanical system design. e resulting structural systems are more ecient than structures developed under pre-IACS rules, allowing Sikuliaq to maximize scientic capability and ice performance for a given steel weight. Similarly, the IACS Polar Class Rules re ect a compilation of current experience in eec- tive design of mechanical systems for performance in ice. While ultimately benecial to eective ves- sel operations in arctic climates, incorporating new mechanical design guidance can be challenging as evidenced by the impact of IACS Polar Class Rules on Sikuliaqs mechanical systems such as the seachests, air intakes, and tank heating systems, as well as on the availability and cost of class-compliant components including thrusters and diesel engines. Sikuliaq is unique in the U.S. research vessel eet in providing accommodation for a disabled mem- ber of the scientic party. e vessel is compliant with the latest disability accommodation guide- lines established by UNOLS, and allows a disabled scientist to be engaged in many aspects of scien- tic operations. In addition to providing a double stateroom fitted for disabled access, Sikuliaqs arrangement incorporates wide passageways, and ush or drop door sills throughout the vessel with personnel lift service to all science mission decks. Finally, the scientic mission spaces have been carefully designed to maximize flexibility and to address the unique challenges of operating in the Arctic. Science operations in extreme environments are supported by unique features that include a Baltic room, which provides an enclosed hangar volume ARCTIC REGION RESEARCH VESSEL BUILDERMarinette Marine Corporation OWNERUnited States National Science Foundation OPERATOR University of Alaska DESIGNERThe Glosten Associates, Inc., Seattle, Washington, U.S.A. CLASSIFICATION American Bureau of Shipping, A1 Oceanographic Vessel AMS, ACCU, DPS-1, Unrestricted Service Ice Class PC-5 SHIP CHARACTERISTICS LENGTH OVERALL 254 ft. (77.4 m) LENGTH, WATERLINE 231 ft. (70.4 m) BEAM, MAXIMUM 52 ft. across reamers BEAM, MAIN DECK 48 ft. at midship DEPTH, MAIN DECK 28 ft. (8.5 m) DESIGN DRAFT 18 ft. 9 in. DISPLACEMENT 3,665 long tons at design draft COMPLEMENT 26 science, 20 crew RANGE16,000 nautical miles ENDURANCE45 days SPEED, OPEN WATER 14 knots SPEED, IN ICE 2 knots, 3-ft. level ice CAPACITIES FUEL OIL 170,000 gallons POTABLE WATER 13,150 gallons MACHINERY PRIME POWER 2 x 1,800 kW (MAN 16V-4000) diesel generator sets 2 x 1,310 kW (MAN 12V-4000) diesel generator sets STERN THRUSTERS2 x Wartsila Z-drive azimuth thrusters BOW THRUSTERS Tees White Gill, 686 kW ROLL CONTROL Intering (Rolls Royce) u-tank SCIENCE OUTFITSTERN AFRAME 30,000 lb. (maximum working load) 120,000 lb. (maximum wire breaking strength) AFT DECK CRANES 36,000 lb., 30 ft. lift radius 15,000 lb., 49 ft. lift radius SCIENTIFIC WINCHES Oceanographic winch ? double drum traction (12,000 m x 9/16 in. wire and 10,000 m x 0.680 in. wire) Hydrographic winch ? motion compensated (10,000 m x 0.322 in. wire) CTD winch ? motion compensated (10,000 m x 0.322 in. wire) BALTIC ROOM OVERTHESIDE GEAR 11,100 pound (maximum working load) WORKING DECK AREA 4,550 sq. ft. SCIENCE LABORATORY AREA 2,250 sq. ft. SPECIFICATIONS: SIKULIAQ