Hyundai to Build Innovative Offshore Vessel for Toisa

Press Release
Tuesday, February 12, 2013
(Photo: Ulstein)

Toisa Ltd. signed a contract with Hyundai Heavy Industries (HHI for the construction of a Multipurpose Offshore Construction Vessel (MOCV) designed by Ulstein. The vessel, with X-BOW hull line design was built in Korea with a customized version of Ulstein's Deepwater Enabler design.

The DP3 vessel is designed for worldwide operations in the oil and gas sector, ultra deepwater installation and construction, flexible lay, pipelay, cable lay and topside construction support. As such the design has been developed for maximum efficiency and cost effectiveness featuring heavy lift capabilities with Active Heave Compensation, two moonpools, upto 50 t/m2 deck strength and the X-BOW hull line design from Ulstein.

The vessel design includes a number of key features, including a fully Active Heave Compensated (AHC) offshore crane rated at 900 tonnes SWL with a depth capability of 3,500 metres and a second, knuckleboom, crane of 200 tonnes SWL with depth capability of 2,000 metres. The vessel can accommodate a 550t flex lay tower over the main moon pool and two 2,500 tonnes capacity carousel spaces below deck. From the enclosed hangar two large work class ROVs can be deployed to port and starboard side or through a central moon pool. The vessel will be delivered with all necessary interfaces to service both ROV’s and saturation dive system.

Main propulsion is provided by three stern azimuthing thrusters, powered by a diesel electric plant of six main generators. The machinery spaces are divided into two engine rooms each containing three of the main gensets. All machinery, power and control systems are physically separated throughout the vessel in full complaince with the requirements for IMO Equipment Class 3 DP. Vessel speed has been optimised to provide a fast transit speed between locations, while capacities are designed to give maximum endurance.

Full compliance with the SPS Code is a fundamental principle of the design, which includes arrangements to meet Comfort Class COMF-V(3) the highest working environment standard. Accommodation for 250 persons is provided including cabins, offices, operations rooms and recreational areas.

The deck area of ca. 2,900 sq. m. is designed to give space for the installation of project equipment such as pipelay spreads, and for the carriage and deployment of heavy offshore equipment for installation. The deck is specially strengthened up to 50t/m2 in key areas.

The Toisa MOCV is the first vessel to be built based on the Deepwater Enabler design and the largest vessel with X-BOW so far. The Deepwater Enabler is a vessel platform developed to allow owners to be more flexible towards changing market requirements and serve alternative subsea and offshore markets in the future.


Main Particulars

Loa 150.5 m
Lpp 144.0 m
Beam (molded) 32.0 m
Depth (molded) 13.3 m
Draft (design) 7.5 m
Trial speed 14.3 knots
Installed power 6 x 3,730 kW
Thrusters, azimuth aft 3 x 3,350 kW
Thrusters, ret. azimuth fwd 2 x 3,350 kW
Thrusters, tunnels 2 x 2,500 kW
Accommodation 250 persons

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