World-class welding technologies - Subsea 7

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10 Fleet development update Subsea 7’s industry-leading commitment to fleet development is directly driven by our identification and anticipation of our clients’ needs for their increasingly challenging subsea field developments. Whether for highly complex deepwater installations, extended Life-of-Field operations or enhanced welding performance, Subsea 7 is committed to working in close collaboration with our vessel-build and equipment partners to incorporate client requirements in the design of new vessels and upgrading of existing vessels. The five new vessels profiled here all reflect, in their different ways, elements of our commitment to deploy a fleet of New-build Seven Borealis With its pipelay and heavy-lift capabilities, Subsea 7’s Seven Borealis is possibly the most versatile offshore construction vessel. Its 5,000t crane, with the top of the mast reaching 150m above the main deck, is the world’s largest offshore mast crane. Recent lift tests in Singapore proved its capability of lifting 5,000t. The Seven Borealis joins the fleet in the second half of 2012. New-build flexible pipelay support vessel (PLSV) Subsea 7 has been awarded a contract to provide a 550t top-tension PLSV for Petrobras for delivery in 2014. This top-tension capability gives the vessel Subsea 7’s highestperforming flexible pipelay capability in the fleet, and among DEEP7 May 2012 unrivalled capacity and versatility, and one which offers our clients access to over 40 vessels with the highest standards of flexibility and project reliability. Enhanced vessel specifications like crane and moonpool capacities are designed to accommodate the hardware which we plan to deploy for the future in support of our clients. This is particularly evident in our latest flagship enabling vessel, the Seven Borealis, which not only features world-leading lifting capabilities, but will also incorporate Subsea 7’s latest mechanised welding technologies on its J-lay and S-lay firing lines (see pages 2 and 3). the highest for any PLSV in the world. This high specification reflects the existing and anticipated demand of Brazilian ultradeepwater operations. The vessel is scheduled to have a 550t Tiltable Lay System (TLS) installed, with two 275t retractable tensioners to handle flexible products between 100mm and 630mm outer diameter. The tower can tilt to 10o when operational to recover rigid pipe from the seabed but it can also tilt to 50o from the vertical to allow the TLS to clear power cables across the entrance to Vitoria harbour. The two underdeck carousels will also be of the open-top “basket” design. The new PLSV also incorporates a number of further design innovations to meet the specific requirements of the Brazilian market. The vessel will be fitted with underwater demountable thrusters which can be removed and replaced while the vessel is afloat.
Seven Viking Due for launch in late 2012, the Seven Viking is designed as a “next generation” Inspection, Maintenance and Repair (IMR) vessel, with enhanced seakeeping qualities and environmental performance. The Seven Viking will enter a long-term frame agreement with Statoil for operations in the North, Norwegian and Barents Seas. The Seven Viking incorporates a number of design features to minimise mobilisation times and optimise transit speeds, most notably an innovative hull shape which offers increased foreship volume and slender waterlines. As well as offering improved seakeeping capabilities (fully operational in 5m significant wave height), this design also provides a larger working deck area, with a raised freeboard and working stations enclosed in a heated indoor hangar to enable IMR operations in rough seas and extreme temperatures. Other innovations which facilitate harsh weather operations include a skidding module handling system to store and move up to eight different modules into the moonpool, eliminating the risk of hanging loads, and de-ice facilities and a strengthened hull for operations in Arctic areas. Seven Inagha Subsea 7 has an impressive track record in developing innovative equipment, and this is confirmed by a new vessel joining the fleet in 2012. The Seven Inagha started her life in 2011 as a high-capacity Gulf of Mexico liftboat. During her construction, she was purchased by Subsea 7 and began her conversion into an extremely capable platform for hook-up operations in West Africa. The Seven Inagha is effectively a vessel with legs, and, unlike most conventional jack-ups, can mobilise to a work site under her own power. She has an impressive lifting capacity with two 295t cranes fitted, and will commence operations offshore Nigeria. With enhanced facilities able to accommodate up to 150 people on board, she will provide utility services and support to hook-up teams on offshore installations. The three eye-catching tubular 97.5m legs have pairs of racks which allow the 36 planetary motors to jack the hull at a speed of 2.4m per minute, elevating the hull to a maximum height of 88m above the seabed in water depths of up to 76m when operating in hook-up mode. Seven Havila The state-of-the-art diving support vessel, the Seven Havila, which is owned by Subsea 7 and Havila Shipping and is widely considered to be the most advanced vessel of its type in the world, has achieved a world first by simultaneously deploying eight saturation divers from a single vessel. The advanced diving system on the vessel includes a ten-chamber, 24-men fully computerised saturation suite, with a double bell handling system capable of working down to 400m and up to 6m significant wave height. 11 seabed-to-surface
Page 1 and 2: Technology news from Subsea 7 - May
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Page 5 and 6: Planning and precision combine on P
Page 7 and 8: Cutting-edge simulation Subsea 7 ha
Page 9: Swaged end connection for reel-lay

World-class welding technologies - Subsea 7

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