Havila Subsea is a supply vessel built to perform inspection, maintenance and repair (IMR) works in the North Sea and other parts of world. She was delivered in June 2011 and flies the Norwegian flag.

The vessel was built by Havyard Leirvik shipyard, owned by Havyard Group, in Turkey. Havila Chartering is the owner and Havila Shipping is the operator of the vessel.

The vessel has been chartered to Subsea 7, a subsea engineering and construction company.

The long-term contract, which commenced in May 2011, will last until 1 January 2013. The contract has an option for further extension.

Design and dimensions of Havila Subsea

Havila Subsea is of Havyard 855 design, which was developed by Havyard Design, the ship design and engineering division of Havyard Group. The Havyard 855 ships are designed to carry out IMR and other remote operations (ROV) on a worldwide basis. The vessel is equipped with catalysts to reduce harmful gas emissions.

“Havila Subsea is of Havyard 855 design.”

The vessel has a gross tonnage of 8,552t and net tonnage of 2,565t. The deadweight is 4,592t. Overall length of the vessel is 98m and length between perpendiculars is 84m. The moulded breadth and maximum draught are 19.80m and 8m respectively.

The vessel also has a 7,200mm x 7,200mm moon pool. A helicopter deck is located in the forward part of the ship. It can support the operations of a single Sikorsky S-92 / Super Puma helicopter.

Construction timeline

The contract for the construction of the vessel was signed in February 2008. The contract value, including owner furnished equipment (OFE), was NKr700 million (approximately $131m).

The keel for the vessel was laid in December 2008 and the launch ceremony was held in June 2010. The naming ceremony was held on 17 June 2011 in Stavanger, Norway.

The hull was built by Cemre Shipyard in Turkey and the vessel was outfitted by Havyard shipyard in Leirvik, Norway.

Cargo capacity of the Norwegian ship

The vessel features a 600m² deck with strength of 10t/m². The deck can hold 1,000 million tons (mt) of cargo. The vessel can store 1,122m³ of fuel oil, 1,000m³ of pot water and 3,000m³ of water ballast.

Accommodation and facilities onboard the vessel

A total of 78 people can be accommodated onboard. The cabin combinations include 22 one-man cabins and 28 two-man cabins. Six offices and one hospital are available. Other facilities include two conference rooms, one sky lobby, one offline room, one online room and one heli-reception centre.

The ship is equipped with a satellite TV. A TV / Radio is present in all lounges and cabins. A gymnasium with equipment is available.

Propulsion and power of the Havila Subsea

Havila Subsea is powered by a diesel electric propulsion system.

“Havila Subsea is powered by a diesel electric propulsion system.”

The power plant is comprised of six Caterpillar 3516 C main engines of 2,150kW capacity each and six SES main generators of 2,100kW each. A Caterpillar C9 emergency generator of 232kW capacity is also provided.

Propulsion is provided by two Ulstein Aquamaster AZP 120 C controllable pitch propellers (CPP), each of 3,500kW capacity.

The vessel is fitted with five side thrusters, two of which are Ulstein Aquamaster tunnel thrusters fitted aft. The third one, Kamewa Ulstein tunnel thruster, is fitted fore. The two retractable thrusters, fitted aft, are of Ulstein Aquamaster Azimuth Thruster UL 2001 make.

Deck equipment

Most of the deck equipments were supplied by ODIM (now part of Rolls-Royce). The ship is equipped with a windlass, four capstans, four mooring winches, two deck cranes and two tugger winches. A Subsea Knuckle Jib Crane of 150t safe working load (SWL) is also available. Two launch and recovery systems (LARS) are available for ROV handling.

Life saving equipment

Safety equipment is provided in accordance with Norwegian Maritime Directorate (NMD) / Safety of Life at Sea (SOLAS) standards. There are six life rafts, each accommodating 32 people. The Alusafe 770 rescue boat can accommodate ten people. Survival suites are available for 78 people.