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Shore approach and landfall works, Libyan gas transmission system

West Libya aimed to enhance its position in the supply of continental Europe's energy needs. As the demand for cleaner energy was rising and gas consumption in Italy wasexpected to increase, Libya and Italy found common ground for cooperation. Construction of a 700 million USD gas treatment plant in Mellitah was the centrepiece of this West Libya gas project. The Mellitah plant is supplied with gas from the desert Wafa field, 520 kilometers south-west of Tripoli, and from the offshore Bahr Essalam field, 110 kilometers north of Tripoli.

The Libyan Gas Transmission Project, also called the Green Stream project, comprised the installation of a 32" gas pipeline across the Mediterranean Sea, approximately 516 kilometers long, from Mellitah landfall to Gela landfall at Sicily, Italy. The client was Green Stream, a joint venture between Agip Gas and the Libyan National Oil Company; the main contractor was Saipem S.p.A., who were also contracted for the installation of the offshore twin pipeline from Bahr Essalam gas field to the Mellitah plant. Boskalis Offshore B.V., in joint venture with Tideway B.V., executed the shore approach and landfall works. These included trench excavation (onshore and offshore), installation of pull arrangements, assistance during pipe pull and backfill (rock and sand) of the trenches.

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Seabed preparations, PGN

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Deepening of the Eems-pipeline

The 42" Eems pipeline is part of the pipeline connection between the gas cleaning and drying plant of Phillips Petroleum at Rysumer Nacken in Germany, and the natural gas pipeline network in the Netherlands. The gas is obtained from the Ekofisk gas field in the Norwegian region of the North Sea. The pipeline crosses the morphologically dynamic Eems estuary over a length of 4 km, passing both the deep shipping lane ‘Oostfriesche Gaatje’ and the shallow sand bank ‘Paap’.

Development gas export pipeline,
Hibiscus to Point Fortin

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Hanze F2a Development Project

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Installation gas pipeline, Takoradi

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Re-insulation Gannet 'C' Bundles, North Sea

The Gannet 'C' satellite field, which is located in the North Sea at 112 miles East of Aberdeen in 95-meter water depth, comprises four drill centres, each having one or more producing wells. The drill centres are connected to the local platform Gannet 'A' by four flowline bundles with a total length of 10 kilometers. A glycol-based gel, filling the annulus of the Gannet 'C' carrier pipe, insulated the individual flow lines. Prompted by degradation of the gel and the resulting drop in oil and gas arrival temperatures at the platform, an EPIC project took off for a re-insulation system. The objective of the re-insulation system was that it should provide sufficient insulation to the bundles in order to safeguard production during the total field life of Gannet 'C', being a minimum lifetime of 15 years. Boskalis Offshore was supported by Hydronamic - the in-house engineering department.