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    Toisa orders DP3 dive support/construction vessel

    Vessel & ROV News // July 1, 2014

    Toisa's new DSV/OCV will be delivered in early 2017.

    Sealion Shipping Ltd, on behalf of Toisa Ltd, has announced that an order has been placed with Shanghai Zhenhua Heavy Industries Co Ltd (ZPMC) for a DP3 multipurpose saturation diving support/offshore construction vessel (DSV/OCV) for delivery in early 2017. The vessel will be equipped with a 24-man twin bell, saturation diving system.

    The vessel design is from Sawicon AS, customised to the requirements of Sealion/Toisa. ZPMC has a proven track record of building complex structures and vessels and a long history of working with international clients requiring a high level of technical and commercial expertise. 
    The new DSV is built around a fully-automated Drass saturation dive system. The 24-man, 300m, twin bell system has been designed to provide NORSOK U100 capability, achieving the highest levels of diver safety and comfort. The provision of two hyperbaric lifeboats and a main deck mounted emergency bell mate trunk, together with other inherent features, prioritize diver safety to the highest level and allow maximum twin bell operation at depth. 

    The vessel is also fitted with a three diver Nitrox/air diving system designed for hoop diving (35m outreach), incorporating a triple drum winch for hose deployment and a designated tooling A-frame. 

    The vessel will have two offshore, active-heave compensated, knuckleboom cranes fitted: a 400 tonne crane with a depth capability of 3,000m, single fall, and an auxiliary crane with a capacity of 25 tonnes and a single fall depth capability of 600m.

    It will have an extensive working deck area of 1,850m2 and, in addition to the dive system moonpools, a large working moonpool of 7.20m x 7.20m, enabling deployment of flexible pipe via client-supplied VLS, or similar. 

    With a minimum deck strength of 15t/m2 and specific areas strengthened to take 50t/m2, carriage and deployment of heavy equipment and special project related machinery is facilitated. 

    There will be two ROV Hangars designed to accommodate large work-class ROVs for overside launch. All the necessary interfaces to service ROVs, as well as dedicated offices, control rooms, workshops and stores are included in the hangar design, producing an ergonomically arranged space for efficient operation of ROVs. 
    The vessel will have three stern azimuth thrusters giving propulsive power plus two tunnel thrusters and one retractable azimuth thruster forward,  all powered by a diesel-electric plant of six diesel generators. These and all the other vesselís machinery are controlled by a fully integrated vessel management and control system.  T

    The vessel is dynamically positioned (DP3) with the dual notation of DYNPOS AUTRO (DP3) and DYNPOS ER (Enhanced Reliability). "DYNPOS ER is a major step forward in DP philosophy whereby the level of increased redundancy and monitoring inherent in this notation not only increases safety but will allow flexibility to operate the vessel in its most efficient mode," said Sealion.


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