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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.

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Jotun A

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Borssele ALPHA/BETA

Royal Boskalis Westminster is a leading global marine contractor and services provider. With safety as our core value, we offer a wide variety of specialist activities to the oil & gas and renewa-bles sectors. These activities include marine instal-lation and decommissioning, seabed intervention, marine transport and services, subsea services and marine survey. In addition, Boskalis is a global dredging contractor, provides towage and terminal services across the globe and delivers marine salvage solutions. By understanding what drives our clients we are able to provide the solutions that enable them to meet their specific business goals. For this reason we are constantly looking for new ways to broaden and optimize our offering and are committed to expanding our proposition, supported by our financial strength. With our committed professionals in engineering, project management and operations, 800 special-ized vessels and an unprecedented breadth of activities in 90 countries across six continents we help our clients in the offshore industry push boundaries and create new horizons.

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