Luxembourg-based Subsea 7 launched its ninth reel-lay vessel, Seven Vega, during a ceremony at Royal IHC’s shipyard in Krimpen aan den IJssel, the Netherlands.
Subsea 7 executive vice president strategy and commercial Stuart Fitzgerald called the vessel “an important investment for the future.” Due for delivery in early 2020, Seven Vega “has been designed to deliver flowline technologies that address the growing market trend towards longer and more complex tie-back developments,” said Mr Fitzgerald. “The vessel’s cutting-edge pipelay system focuses on crew safety, operational efficiency and flexibility. This system will be capable of installing complex rigid flowlines including pipe-in-pipe systems and electrically heat traced flowlines in water depths up to 3,000 m.”
IHC designed Seven Vega in close co-operation with Subsea 7.
Royal IHC chief executive Dave Vander Heyde said, “The integrated approach of IHC to vessel design will give Subsea 7 an industry-leading asset that sets a new standard in offshore pipelay.”
Seven Vega has an overall length of 149 m, breadth of 33 m, depth of 13 m and is dynamic positioning class 3 capable. Its reel-lay system has a 600 tonne top tension capacity consisting of a 32-m main reel and a 17-m auxiliary reel with a maximum storage capacity of 5,600 tonnes and 1,600 tonnes, respectively. Seven Vega has an active heave-compensated main crane with a lifting capacity of 250 tonnes, two auxiliary deck cranes and ramp cranes alongside two side-launching work-class ROV systems. It will have accommodation for 120.
A fully integrated reel-lay vessel, Seven Vega’s compact dimensions are due to the creative positioning of its three enginerooms and main reel, efficient use of the superstructure, and low air draft pipelay tower, said Subsea 7. The design opens up a large aft working deck, while the optimised mass distribution minimises the ballast water requirement.
The twin tensioner pipelay ramp tilts to allow pipeline installation from shallow waters to depths of up to 3,000 m. The large multi-level workstation optimises efficient operations in and around the firing line, while having the main and auxiliary reels recessed into the main deck offers payload flexibility.
In addition, the all-electric main crane allows lift parameters to be adjusted promptly without manually adapting the active heave system. By having fewer components, maintenance and energy consumption are also reduced.