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Jan de Nul Starts Trenching Work for Langeled Project
01 Jun 2005
Work on excavating a trench to the landfall for the Langeled gas trunkline is well under way on the seabed off Easington on the east coast of the UK, with Jan de Nul 's dredger J F J de Nul dredger excavating the trench.
Work started on May 12, approximately 1km from the shore, and the trench will eventually extend some 20 miles out from the coastline. The final section of the trench to the cofferdam, which is some 240m from the shoreline, has already been excavated. Lined with sheet piles, the cofferdam is designed to prevent the sea washing sand down into the trench in the splash zone.
The trench that the dredger is excavating will be 10m wide and 2m deep, and is due to be re-filled as the pipeline is laid.
A 400m tunnel has already been constructed from the shoreline to the gas terminal at Easington, and all traces of this work will be eliminated as soon as laying has been completed. The lay barge Mor is due to lay the pipeline over its first 15km from land, and a shore-based winch will be used to pull the pipeline through the cofferdam and in to the shoreline before the barge starts laying out into the North Sea.
The lay barge LB200 hasalready begun installing the Langeled line south from Statoil's Sleipner riser gas transport hub in the Norwegian North Sea. Once Tog Mor hascompleted its work, LB200 will pick up this part of the line and continue laying north until the two sections can be welded together.
Langeled will ultimately carry gas from the Ormen Lange field in the Norwegian Sea via the Sleipner riser to Easington. Statoil is responsible for the project on behalf of operator Norsk Hydro. The Easington terminal is due to come on stream in October 2006 to deliver gas via the Sleipner area. Ormen Lange is due to come on stream 12 months later.
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