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Landfall construction
Balearic submarine pipeline

As part of its network expansion program, Enagas undertook the installation of a submarine pipeline providing natural gas from the Spanish mainland to the Balearic Islands of Ibiza and Mallorca, integrating them into the Spanish gas system. This 20" nominal diameter pipeline was constructed in two distinct sections, one of 123 km between the mainland and Ibiza and another of 146 km between Ibiza and Mallorca.

Boskalis constructed the four landfalls of these pipeline sections at the three shore approach locations. Each shore approach posed highly different conditions:
  • a sandy beach at Dénia,
  • a rocky cliff at Ibiza and a shallow gravel and
  • sandstone approach at Mallorca,
the latter further complicated by space restrictions onshore.

Denia landfall

The landfall at Playa Les Deveses was characterized by a sandy seabed and beach and small dunes. A trench would provide protection for the pipeline along the shore approach.

Ibiza landfall

At Punta de Cala Gració the shoreline consisted of a rocky cliff. To cover the height difference between the seabed and the cliff two micro tunnels had been drilled previously, into which 48" casing pipes of 150 m each had been installed.

Mallorca landfall

The Mallorca landfall at San Juan de Dios featured a gravelly / rocky seabed and sandstone coastline with space onshore limited by an existing water plant and fish farm.

Related projects

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Seabed preparatory works,
Dana Medway

Dana Petroleum Netherlands B.V. is the operator of the Pllb De Ruyter field and oil-producing platform located in the Dutch section of the North Sea.

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Rock installation, PDET

In 2008 Boskalis was approached by Petrobras to carry out a rock installation project at the oceanic terminal, one of Petrobras’ offshore oil production locations. The terminal, situated at Campos Basin offshore Rio de Janeiro, Brazil, is a maritime complex consisting of one Independent Re-pump Platform (PRA-1), two monobuoys and a FSO vessel which links to a 20 inch gas pipeline system.

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Construction wind farm, Belwind

SMIT sheerlegs Taklift 4 installed the final element for one of Belgium’s first offshore wind farms, Belwind, the wind farm’s high voltage transformer substation. SMIT also provided the transport of the element and other marine support services to assist the construction of the wind farm.

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Offshore wind farm, Walney

Windfarm construction projects regularly feature in the work programmes of SMIT’s sheerlegs fleet. For example, the Taklift 7 was involved in the Walney Offshore Windfarm development in the Irish Sea. Walney Offshore is a wind farm project developed by DONG in the Irish Sea, some 20 miles from the coast at Barrow.

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Pipeline crossing, Strait of Magellan

The project involved the construction of a new, strategically important, 24" natural gas pipeline across the Strait of Magellan, linking Cabo Espíritu Santo in Tierra del Fuego province with Cabo Vírgenes in Santa Cruz province. The new pipeline was built as an expansion of the existing San Martín pipeline in an effort by the government to increase gas supplies from Tierra del Fuego to the Argentinian mainland.

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Offshore wind farm, Sprogø

On behalf of marine contractor Aarsleff, SMIT was involved in the construction of the new Sprogø Offshore Windfarm, west of Copenhagen.