Costa Azul large diameter rock socketing for mooring piles

Geosea Costa Azul
 
 

Challenge

At less than 80 km south of San Diego/Tijuana and 22 km north of Ensenada, the importance of the 975 million USD Costa Azul LNG terminal can hardly be overestimated. The terminal has a current capacity of 1 billion cubic feet per day, which can be expanded to process 2,5 billion cubic feet per day.

In 2005 Sempra LNG, a subsidiary of the US San Diego based company Sempra International, was awarded a 15-year natural gas supply contract by Mexico’s state-owned electrical utility, Comisión Federal de Electricidad (CFE). Barely three years later, the 210.000 m³ Al Safliya brought the first LNG from Qatar to the new terminal on the extreme northwest coast of Mexico. In between, DEME company GeoSea constructed the mooring berth.

Our solution

 

In front of two full-containment 160.000 m³ storage tanks, LNG vessels in Costa Azul moor at the extreme end of a jetty which was constructed by Saipem. DEME company GeoSea carried out the large diameter rock socketing works consisting of drilling fourteen offshore pile sockets, the construction of an LNG berthing dolphins system, and the related installation and grouting of the mooring- and breasting dolphins. Moreover, two tug boat mooring piles were drilled in the rocky sea bottom. This infrastructure was built perpendicular to the Saipem jetty.

Drilling operations were executed from the 20 x 42 m jack-up platform ‘Zeebouwer’, positioned on four anchors. The eight mooring dolphins and the four breasting dolphins are up to 36 m long, with a diameter of 2.8 m allowing for an adult man to easily walk through. This highly specialized construction- and installation work was completed to the full satisfaction of the client.

 

 

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