A platform in the Troll gas field

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Troll is a natural gas and oil field in the Norwegian sector of the North Sea, 100 km North-West of Bergen, 50 km west of the island of Fedje.


The Troll A platform, based on the Condeep technology, is the largest structure ever to be moved. Total weight is 656,000 tons, the total height is 472 meters. The depth is 303 meters.


The Troll A platform is the largest Condeep to this date. It was built over a period of four years, using a workforce of 2,000, and deployed in 1995 to produce gas from the enormous Troll oil field. With a total height of 472 meters, Troll A was the largest structure ever to be built and moved. The total weight when launching was 1.2 million tons. 245,000 m³ of concrete and 100,000 tons of steel for reinforcement were used. The amount of steel corresponds to 15 Eiffel towers. The platform is placed at a depth of 300 meters. For stability, it is dug 35 meters into the sea floor.


Condeep (abbr. concrete deep water structure) refers to a make of gravity base structure for oil platforms developed and fabricated by Norwegian Contractors in Stavanger, Norway. A Condeep usually consists of a base of concrete oil storage tanks from which one, three or four concrete shafts rise. The original Condeep always rests on the sea floor, and the shafts rise to about 30 meters above the sea level. The platform deck itself is not a part of the construction. The Condeep is used for a series of production platforms introduced for crude oil and natural gas production in the North Sea.


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