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    Hyundai to build multipurpose OCV design for Toisa

    Vessel & ROV News // February 13, 2013

    Toisa's multipurpose OCV will be the largest buitl with the X-BOW.

    Toisa Ltd has signed a contract with Hyundai Heavy Industries (HHI) for the construction of a multipurpose offshore construction vessel (OCV) designed by Ulstein in Norway.

    The vessel is the first with Ulstein X-BOW to be built in Korea, and is 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, with heavy lift capability via a crane with active heave compensation (AHC), two moonpools, and up to 50tonnes/m2 deck strength.

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

    The AHC offshore crane is rated at 900 tonnes SWL with a working depth of 3,500m. The vessel will laos have a second, knuckleboom crane of 200 tonnes SWL with working depth of 2,000m. The vessel can also accommodate a 550 tonne flex lay tower over the main moonpool and has two 2,500 tonne capacity carousel spaces below deck.

    From the enclosed hangar two large work class ROVs can be deployed to port and starboard side or through the central moonpool. The vessel will be delivered with all necessary interfaces to service both ROVs and a 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. The vessel's speed has been optimised to provide a fast transit speed between locations.

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

    The deck area of circa 2,900m2 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 tonnes/m2 in key areas.

    The Toisa OCV is the first vessel to be built based on the Ulstein 'Deepwater Enabler' design and is the largest vessel with the X-BOW so far.

    The new vessel will have a length overall of 150.5m, Lpp of 144.0m, beam (moulded) of 32.0m, depth (moulded) of 13.3m, and draught (design) of 7.5m. Trial speed will be 14.3 knots.


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