Skandi Arctic - Offshore Subsea Construction and Diving Support Vessel, Norway
Skandi Arctic is a purpose-built diving support and offshore subsea construction vessel built by STX Europe. The vessel is owned by Doftech DA (a joint venture between DOF Subsea AS and Technip Norge AS). The vessel was built in 2008 and became operational in March 2009. It was constructed at STX Europe's Soviknes Yard in Norway.
Skandi Arctic is capable of working throughout the year and is suitable for all sea and weather conditions. It is designed to cope with North Sea market demand and needs. The vessel is now in service with Technip UK on an eight-year contract.
The vessel is certified for global trading and provides saturation dive support for offshore construction and inspection, repair and maintenance (IRM) operations. Environmentally friendly features and low fuel consumption enable the vessel to meet DNV clean design requirements.
Skandi Arctic’s sea-keeping abilities and station-keeping performance make it one of the most sophisticated diving support vessels in the world.
Design and features
The vessel is based on STX Europe's OSCV 06 L DSV design. The hull was developed with a calm water and sea keeping model test programme, which improves performance in calm water and waves.
STX Norway Offshore Design Alesund designed the OSCV 06 L DSV. The hull was constructed by STX Europe in Romania. STX Norway Electro provided the integrated automation system, power management and switchboards. The outfitting and completion of the vessel was carried out at STX Europe's Soviknes yard.
Skandi Arctic has an overall length of 156.9m, a between perpendiculars (BP) length of 137.7m and a breadth of 27m.
The depth to first deck is 12m, the design draft is 6.5m and the scantling draft is 8.5m. The ship has a dead weight of 11,500Te at 8.5m.
The 1,700m2 open deck provides the loading capacity of 10Te/m2. The ship also has an additional under-deck storage and lay-down area.
Equipment and systems
The heave compensated box boom crane serves as the main lifting facility. It has a lifting capacity of 400Te at a radius of 11m. The vessel also features a knuckle boom crane with a lifting capacity of 58Te at 11m radius. The two other knuckle boom cranes, which have lifting capacities of 5Te at 14m radius, are also located at the dive workstation. These cranes are suitable for offshore and subsea applications.
The vessel can be fitted with a vertical lay system (VLS) and carousel/reels, which are used to lay flexible pipes through the working moon pool.
The 350msw-rated saturation diving complex consists of two six-man and four three-man living chambers and two three-man diving bells, each of which is 7m3. The system complies with Norwegian NORSOK standards. Two 18-man hyperbaric lifeboats are available.
A dual Kongsberg K-Pos dynamic positioning system is available onboard. Multiple position reference systems such as fan-beam, radius, taut wire, HiPAP and DGPS solutions support the system. A hyperbaric monitoring and control system (HMCS) aids the 24-man diving chamber complex.
Two 3,000m-rated workclass remotely operated vehicles (ROVs) are located in a dedicated hangar. They are capable of supporting a payload of 3Te and each is equipped with a heave compensated gantry. The deck also features an observation class ROV. Diving and ROV operations are simultaneously carried out by the ROV systems.
The vessel has 58 single cabins and 41 double cabins, which can accommodate up to 140 people. Each room features a separate toilet and shower. Recreational facilities include a mess room, day rooms and a library, cinema and gymnasium.
The vessel is propelled by six Wartsila 7L32 diesel engines. The generators driven by each engine provide a total output of 19.2MW.