The next generation Inspection, Maintenance and Repair (IMR) vessel ‘Seven Viking’, designed and built by Ulstein, was awarded the ‘Ship of the Year 2013’ award by the maritime magazine ‘Skipsrevyen’ at Nor-Shipping on 4 June 2013.

CADMATIC software was used to design all the vessel’s steel structures, machinery and piping systems, cable ways as well as steel outfitting and HVAC systems. Ulstein has extensive experience in using CADMATIC software and was the first Norwegian company to implement CADMATIC for detailed design in the mid 1990s. 

The Seven Viking was designed for operations in the harshest environments. It was delivered from Ulstein Verft in January and is co-owned by Subsea 7 and Eidesvik. It has been working for Statoil on a five-year contract since February 2013.


The ICE-C class vessel has a crew capacity of 90 and a top speed of 17 knots. It has been custom-built according to the operator’s specifications to carry out tasks including inspection, maintenance and repair of subsea installations, in addition to scale treatment and RFO (Ready for Operations) work scopes.

‘Seven Viking’ incorporates the X-BOW® hull line design to reduce motion in transit and give increased stability in the potentially high waves that characterise the North Sea. Despite this enviable stability usually associated with size, this version of the SX148 design from ULSTEIN has been crafted to be compact in stature – measuring only 106.5 metres long and 24.5 metres wide. The dimensions will allow the ‘Seven Viking’ to manoeuvre with ease in confined spaces, such as between platforms, accessing difficult to reach areas.

Clever configuration

Thanks to a clever configuration whereby hull space is maximised and equipment is integrated within a large hangar area, ‘Seven Viking’ can carry all necessary maintenance equipment on board, ensuring that operational downtime is kept to a minimum. Safety, efficiency and environmental considerations have been the prime focus for the three partners when developing the vessel, which carries the Clean Design notation.


‘Seven Viking’ has been developed to meet the highest working environment standards, and is classified as a comfort class COMF-V (3) vessel. Minimal noise levels in the hangar have been achieved by opting for electric winches for the ROVs, the MHS and other utility equipment. In addition, she features a separate accommodation unit, positioned away from all active work areas, to ensure that the crew can rest without any disturbances. 

Notable environmental initiatives include diesel electric propulsion, which reduces atmospheric emissions, and the electrical winches which nullify the risk of hydraulic oil emissions.

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