A walk in the wind park

Acta Marine’s new 93.4m construction support ship, Acta Centaurus, features a motion-compensated gangway for safe, step-free transfers of both personnel and cargo

Acta Centaurus has been designed for safe personnel/ cargo transfers

vibrations. Ulstein claims: “When keeping the stern facing the weather on dynamic position [DP], the vessel will be able to stay positioned with lower thruster load, resulting in lower fuel consumption.”


cta Marine has taken delivery of

a new walk-to-work produced by Ulstein Verft

construction support vessel, for


complement of up to 120 offshore technicians, and predominantly intended for offshore wind farm construction and maintenance support work. Christened Acta Centaurus, the 6,050gt

vessel measures 93.4m (loa) × 18m (moulded) and features a moulded depth of 7.6m and a 5.6m draught. Tis is the second vessel produced by Ulstein for Acta Marine, following the 2018 delivery of Acta Auriga. Acta Centaurus has been built to match comfortable and “smart hotel


accommodation with practical onboard features, accounting for feedback from existing vessels with regards to typical operations and personnel flow. The ship’s cargo areas, both exterior and interior, amount to 1,000m2 of space in total. Tis area is split evenly between the weather deck and main deck, which feature load capacities of 250tonnes and 650tonnes respectively.

Stepless lift The ship also features a container skidding system with room for 24 TEU containers, spread over two deck levels. Handling of cargo has been organised in a centralised manner, Ulstein says, with the liſt designed in a step-free fashion, to facilitate personnel/cargo transfers.

Offshore Marine Technology 2nd Quarter 2019 Te vessel also features a helideck with

a maximum load capacity of 7.5tonnes. Ulstein comments: “Te overall logistics and the SMST motion-compensated gangway and integrated elevator tower will secure safe and stepless transfers of people and cargo in significant wave heights up to 3m.” SMST also supplied the vessel’s 3D motion-compensated knuckle boom crane, which is capable of liſting cargoes of up to 6tonnes with compensation and 20tonnes without compensation. Ulstein adds: “Te gangway is capable

of liſting cargo up to 1tonne with motion compensation…[and] facilitates efficient handling of electronic cargo trolleys loaded with 300kg Euro pallets.” Te vessel also incorporates Ulstein’s

X-Bow and X-Stern hull designs, which were specified to assist safe operations in heavy sea states, and especially in reducing overall slamming levels and

The 6,050gt vessel features 1,000m² of combined cargo space

DP mode Acta Centaurus is powered by four diesel engines: two generating 1,700kWe apiece and two rated 940kWe each. A separate emergency generator, rated 200kWe, has also been installed. Te vessel has also been equipped with: a pair of 1,500kW stern thrusters; a tunnel bow thruster, rated 1,040kW at 1,200rpm; and two swing-up thrusters on the bow, each rated 880kW at 1,800rpm. When transiting with a draught of 5m, the vessel can maintain a maximum speed of 13knots. Onboard capacities include: 980,000litres

of fuel oil (both for the ship’s use and as cargo); 840,000litres of

fresh water;

40,000litres of lube oil and hydraulic oil; and 1.97 million litres of ballast water. Ulstein has estimated that, when operating in DP mode, the vessel will consume fuel at a rate of about 3.3tonnes per day, and claims that it has autonomy of approximately 30 days. The ship incorporates offices and

workspaces, intended for use by its charterers, as well as a mess room and a lounge area containing a library, ‘coffee corner’ and games room. Personnel can also make use of a sauna and gym area. The vessel’s classification process was overseen by DNV GL. OMT


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