Similar ideas popular now
Troll A The Tallest Structure Ever Moved by Mankind-The Troll A platform has an overall height of 472 metres (1,549 ft) and weighs 683,600 tons (1.2 million tons with ballast). The platform stands on the sea floor 303 metres (994 feet) below the surface of the sea and one of the continuous-slip-formed concrete cylindrical legs (the leg containing the import and export risers) has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor. [source]
Modern offshore structures include (from left to right): 1 and 2 are conventional fixed platforms; 3 is a compliant tower; 4 and 5 are vertically moored tension leg and mini-tension leg platforms; 6 is a spar platform; 7 and 8 are semi-submersibles; 9 is a floating production and offloading facility; 10) sub-sea completion and tie-back to host facility.