Island Enforcer Offshore Construction Vessel

Island Enforcer is an offshore construction vessel (OCV) built by Norwegian ship-builder Bergen Group.


August 2010





Gross Tonnage



Island Enforcer is an offshore construction vessel (OCV) built by Norwegian ship-builder Bergen Group.

Ordered by Island Offshore, she was built to meet the growing demand for offshore maintenance and construction work.

She was chartered to Norske Shell which engaged her in the Ormen Lange field immediately after delivery.

The vessel was originally ordered by Aquanos Offshore (now defunct) in 2007 as a diving / ROV / survey vessel, but was purchased by Island Offshore in late 2009.

She was later redesigned for offshore construction and maintenance works.

The construction contract remained with Bergen with little changes in the contract conditions.

Island Enforcer design features

The vessel is of ST-257L CD design that was developed by Skipsteknisk in 2007.

“Island Enforcer is an offshore construction vessel (OCV) built by Norwegian ship-builder Bergen Group.”

ST-257L CD vessels are of DP3-class and have a deck area of approximately 1,000 to 1,100m2.

They are equipped with diesel electric propulsion plant and feature a helicopter deck capable of accommodating a Sikorsky helicopter.

The vessel features three moon pools, two of which are equipped for ROV-system operating at a water depth of 4,000m.

A third moon pool measures 7.2mx7.2m and is designed to perform subsea construction work. The ROV moon pools measure 4.8mx4.8m.

The gross tonnage of the vessel is 7,500t and her overall length is 122.4m. Length between perpendiculars is 107.4m, moulded breadth is 23m and draught is 6m. Actual deck area is 1,100m2.

Construction of Bergen Group’s Island Enforcer

Island Enforcer was built under the supervision of classification society Det Norske Veritas (DNV).

Her hull was built in Poland by Stocznia Gdansk and was delivered in 2009. The outfitting was done by Bergen Mekaniske Verksted (now Bergen Group BMV) in Bergen, Norway.

A hospital and a helicopter landing facility are built on the deck.

After the naming ceremony in Bergen, the vessel was delivered to her owner, Amnor Bergen, in August 2010.

Accommodation onboard

A total of 120 persons can be accommodated on the ship. Hotel / recreation facilities include a cinema, saunas, gymnasium and coffee shop. The vessel also has fully equipped conference rooms and an internet lounge.

Propulsion and power

The vessel is powered by four Pon Power – Caterpillar C280-12 main engines. Each engine can generate 3,800kW at 920rpm.

There are four Hyundai HSJ7 803 – 8P diesel electric generators generating 3,640kW each at 900rpm and one Caterpillar 3412 emergency generator of 550kW capacity.

Propulsion is provided by two Schottel SRP 3330 propulsion system, each of 6,400kW capacity.

The vessel is fitted with four side thrusters, two of which are Brunvoll Tunnel Thrusters. The third one is Brunvoll Retractable Azimuth Thruster and the fourth one is Brunvoll Stern Thruster. There are two electric driven propeller units.

Diesel electric plants comprised of frequency converters, generators, transformers, propulsion motors, thruster motors, power management system and switchboards were supplied by Siemens.

Equipment onboard the Island Enforcer

Island Enforcer is equipped with six cranes. Crane number one, supplied by Cargotech, has a safe working load (SWL) of 200t at 10m outreach.

“The vessel is of ST-257L CD 2007 design developed by Skipsteknisk.”

Crane number two was supplied by National Oilwell Varco and has a SWL of 100t at 10m outreach. Heila supplied two cranes, each of 10t SWL.

The two cranes supplied by Dreggen are provided with 1,000m wire.

An anti heeling / active roll, reduct system was supplied by Rolls – Royce.

Key suppliers involved

Electrical engineering and installation was carried out by Bergen Group Vest Elektro. Pipe systems were provided by Bergen Group Skarveland and Genfer Ship.

Marine Technologies supplied the integrated bridge system (IBS) and DP system, while Høglund supplied the integrated alarm system (IAS). Installation of accommodation and furniture was done by R&M Ship Interior.

NavCom supplied navigation and communication equipment, while Norwegian Deck Machinery supplied anchor windlasses and capstans. Starting air compressors were supplied by Sperre Industri, LP air compressors by Atlas Copco, the sanitary discharge system by Jets and consoles in engine control room by Elpro.

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