Hyundai Heavy to build X-bow MOCV for Toisa

Toisa MOCVFEBRUARY 12, 2013 — Toisa Ltd. has signed a contract with Hyundai Heavy Industries for the construction of an Ulstein designed multipurpose offshore construction vessel (MOCV).

The 150.5 m vessel is a customized version of Ulstein's Deepwater Enabler design. It will be the first vessel with the Ulstein X-Bow hull line design to be built in a Korean shipyard and the largest vessel with the X-Bow so far.

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. The design has been developed for maximum efficiency and cost effectiveness featuring heavy lift capabilities with Active Heave Compensation, two moonpools, up to 50 t/sq.m deck strength and the X-Bow hull line design.

'What makes this vessel unique is that it is developed with future requirements in mind', says Bram Lambregts, Marketing and Sales Manager at Ulstein Sea of Solutions. "The good and very close cooperation with Toisa and HHI resulted in a very versatile vessel design."

The vessel design includes a number of key features giving maximum capability and flexibility. These features include a fully Active Heave Compensated (AHC) offshore crane rated at 900 tonnes SWL with a depth capability of 3,500 m and a second, knuckleboom, crane of 200 tonnes SWL with depth capability of 2,000 m.

The vessel can accommodate a 550 t 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 with 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 optimized 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 spacious cabins, offices, operations rooms and recreational areas.

The deck area of about 2,900 sq.m is designed to give optimised clear 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 50 t/sq.m in key areas.

A fully integrated vessel management and control system covering all key functions will be fitted.

The Toisa MOCV is the first vessel to be built based on the Deepwater Enabler design, a vessel platform developed to allow owners to be more flexible and serve alternative subsea and offshore markets.

Main principals of the vessel are:
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 kn
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
Accommodations 250 persons

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