Seven Viking is a subsea inspection, maintenance and repair (IMR) vessel designed to operate under severe conditions in the North Sea. The vessel is co-owned by Subsea 7 and Eidesvik and was constructed in collaboration with Ulstein. She was earlier launched in October 2012 from the dock hall at Ulstein Verft. The cost of construction of the vessel was about NOK 1bn ($181m).
Designed with an X-Bow hull line, Seven Viking will now serve Statoil, confronting extreme conditions in the North Sea, for a period of five years. Seven Viking measures 106.5m in length and has a moulded breadth of 24.5m. The compacted dimension of the vessel, featuring the SX148 design, will enable it to access difficult areas and operate in confined spaces between offshore platforms. The deck of the vessel covers an area of about 830m² and the vessel has a gross tonnage of 11,266t.
The depth of the vessel to the main deck is 11.5m and the maximum draught is 8m. The designed operational draught is 6.5m. Seven Viking features a combined control room for a shift supervisor, module handling system (MHS) control, ROV control, scale treatment control, third party control and survey with direct view to MHS.
The vessel received a number of DnV 1A1 class notations including SF, E0, DYNPOSAUTR, CLEAN DESIGN, NAUTAW, COMF-V(3), DEICE, ICE-C, HELDK-SH(CAA-N), WS and LFL to operate in severe weather conditions in the North Sea. The vessel features a helideck that is capable of accommodating SuperPuma and Sikorsky S-92. The helideck measures 26.1m in diameter and has capacity of 12.8t.
Two lifeboats are incorporated into the vessel. The boats have capacity of 48 people, and there are two marine evacuation chutes (MES) with a capacity for 65 persons each and a fast rescue craft (FRC).The vessel is also fitted with a ballast water treatment system, environment friendly lighting systems and a fire detection and fire fighting system.The vessel has the capacity to hold 2,073m³ of fuel, 1,493m³ of potable water, 3,340m³ of ballast water, 554m³ of brine, 441m³ of special products, 587m³ of brine in four tanks, a cofferdam with a capacity of 2,447m³, a 54m³ open tank, 78m³ of lube oil and 77m³ of sewage