ELI5. How are the solid legs for oil platforms built? those legs go down a thousanf feet or more down to the ocean floor if it’s not a floating platform, so how do they lay those giant legs? Submarines? Cranes?
In: 16
It can depend on the type of platform. Jacket piling has already been covered, let me tell you of another:
The [Troll A gas platform](https://preview.redd.it/8ggall830i351.jpg?auto=webp&s=60e364caaae7c6d558c4fe81b4b8ea2fa435b168) was built on land (the vacuum anchors, legs, and I believe chord shortener (the boxy thing between the legs partway up – it damps out any wave resonances with the legs) being continuous-pour reinforced concrete), and then [towed out to the site.](https://datis-inc.com/wp-content/uploads/2020/06/Troll-A-Platform-Datis-Export-Group-Article-June-9-01-870×1024.jpg) [Very, very slowly and carefully.](https://lh3.ggpht.com/-3qwJaiG_vOQ/UT9IotaFejI/AAAAAAAAmJA/Qs-8ps609YA/troll-platform-12.jpg?imgmax=800)
All 1,549 ft (472 m) of it.
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