Published: May 01, 2007
SUBSEA 7 is about to begin sea trials on its latest deepwater rigid pipelay vessel Seven Oceans before it commences work offshore Brazil, writes Martyn Wingrove.
The 12,340 dwt ship was built by Merwede shipyard, part of the IHC Holland Merwede group in the Netherlands and will be used to lay rigid and flexible pipelines on deepwater subsea oil projects around the world.
Sea trials are set to begin in the second week of May on the new ship, which has a Huisman Itrec supplied pipelay spread and two work-class remotely operated vehicles, before final delivery in June.
The ship is due to work for Brazilian state oil firm Petrobras from the fourth quarter of this year and then has a contract with Shell on the BC 10 project off Brazil in 2008.
It will then be heading to Angola to work for Chevron off Cabinda.
Seven Oceans is the first of three newbuild ships under construction by Merwede for Aberdeen-based Subsea 7. Flexible pipelay vessel Seven Seas is due to be delivered in the second quarter of 2008 and a new North Sea class diving support ship could be ready early in 2009.
Subsea 7 said construction of Seven Seas, which will be able to lay flowlines in a J lay mode, is at an advanced stage and the ship should be launched by Merwede in early June, one month ahead of schedule.
Seven Oceans will be able to install rigid pipes up to 16 in, plus it can be used to lay flexible flowlines and umbilicals on deepwater oil projects. The pipelay spread comprises main and piggyback reels and an adjustable lay ramp, which has a top tension capability of 300 tonnes, while the main reel can store 3,500 tonnes of pipeline.
There is a Huisman deck crane that can handle 350 tonnes, accommodation for 120 workers and a Kongsberg Simrad dynamic positioning and propulsion system on board.
Subsea 7 is setting up a new spoolbase on the island of Vigra, off Norway, after signing a deal with Alesund Regional Harbour Authorities to assist operations on pipelay vessels Skandi Navica and Seven Oceans.
The NKr150m ($25m) spoolbase will fabricate flowlines for subsea construction projects.
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