Pipelay of the longest subsea pipeline has started

More than a million tons of steel will be used, and the production of the pipe alone will lay claim to a third of the world’s total current production capacity for this type of pipeline.

100,000 pipes in all will be coated externally with asphalt and concrete before installation in the North Sea, requiring over a million tons of concrete and 25,000 tons of steel reinforcements. Two of the world’s largest pipeline-laying vessels, Stolt Offshore’s LB200 and Allseas’ Solitaire, are laying the 1,200-km long Langeled pipeline between Aukra and Easington, in addition to the pipelines from the field to the onshore processing plant. LB200 has started the pipe lay from the Sleipner platform in the North Sea and is heading south towards Easington. Solitaire will start laying the first 33km of Langeled and the production lines from Nyhamna in the beginning of June. The main section of the northern leg of Langeled will be installed next year.

Norsk Hydro has designed the pipeline to carry more than 70 million cum/d.

The Ormen Lange field lies in an area of the Norwegian Sea with climatic and oceanographic conditions that make it one of the world’s most-demanding gas-development projects. The combination of great sea depths, highly irregular seabed terrain, strong underwater currents, sub-zero temperatures, and challenging wind and wave conditions, have imposed considerable challenges on all parties involved in the project. Development operator Hydro has mobilized significant portions of the Norwegian research community together with Norwegian industry in order to find solutions to problems far more complex than those previously encountered in oil and gas development projects on the Norwegian Continental Shelf. Hydro is the development operator for both Ormen Lange and Langeled, while Statoil has the management of the Langeled project in co-operation with Hydro.

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