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Greenstream

Greenstream is the longest underwater pipeline ever laid in the Mediterranean Sea: it has a diameter of 32", is 520 kilometers long and crosses the sea at the depth of 1,127 meters.
The Greenstream project (Libyan Gas Transmission System - LGTS) is part of the Western Libyan Gas Project and includes the Mellitah Compressor Station on the Libyan coast, the underwater gas pipeline and the Reception Terminal at Gela, in Sicily.
Construction of the pipeline began in August 2003; laying activities lasted for about six months and were concluded in February 2004. When fully operational, Greenstream will transmit 8 billion cubic meters of natural gas per year.
Construction of Greenstream was commited by Saipem, an Eni company, that used the Castoro Sei and Crawler vessels for the laying of the pipeline and shore approaches.

• Technology
• Technical diagrams

The depth and the slope of the seabed where the pipeline was laid, the many crossings of cables, the close attention to the environment and the very tight timetable made the Greenstream project a challenge with high technology content.
For about 50 kilometers, the Castoro Sei ship posed the pipeline at a depth almost double (880-1127 m) than the one achieved with traditional laying methods.
 
To operate in deep water it was necessary to make some modifications to the ship, in particular to the whole mooring system. The launch ramp was also revised to optimize the timing and increase the average daily production. Innovative monitoring systems, already tested during the Blue Stream project, provided the technical state of stress of the tube during launch operations in real time.

 

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  Advertising for the start of Greenstream
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  Pipeline Map
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  Longitudinal profile
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  Dept profile

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