This is a fascinating technology, created by the great Ed E Horton (HORTON Wison Deepwater inc), a perfect solution for deep waters production.

What about uploading this in HD-quality ? :-) Very nice and informative video.

it's very useful

Obsolete. BP cancelled Technip spar for Mad Dog 2 and selected Lang’s MPSS. This reduced costs from $22 billion to $9 billion. The semi is now building in Korea at a cost $1.3 billion! Langs MPSS for renewables is a fraction of that since it is a non hydrocarbon application, less hazardous!

Obsolete since Mad Dog reached twenty two billion and was replaced by Langs MPSS, saving $13 billion!

Frank, today 2018, this is obsolete. The MPSS ring pontoon semi with SCrs (also our invention) and two million barrels storage as we, Seaways Engineering (UK ) Ltd, London, promoted in UK in 19888 is now dominant. At that time others had written off semis and turned to ship shapes and this very expensive creature. BP saved $13 billion by cancelling the Spar for Mad Dog 2 and adopting our ring pontoon semi. We were funded by Conoco and approved by Shell. More savings to come as they adopt lessons I learned on building three poorly designed semis in the 80s. See www.swaei.com.