Heavy LIft Construction Vessel Seven Borealis
Discussion
ninja-lewis said:
ok, stupid question of the week: How do they stop the ship bouncing up and down and repeatedly smashing into the bottom of the rig before it's all bolted together? Are those "cross arms" pivoted or something?Max_Torque said:
ninja-lewis said:
ok, stupid question of the week: How do they stop the ship bouncing up and down and repeatedly smashing into the bottom of the rig before it's all bolted together? Are those "cross arms" pivoted or something?Basically the lift is done from pivots on the end of the cross-arms which are hydraulically stabilised. Clever stuff.
Paddy_N_Murphy said:
How fking silly..... that's a jack up. There must have been a fleet of alternative (read: Cheaper) solutions than sending the PS to fetch it from the field.
It was a storage platform...As above, this job was probably a loss leader, but it's great exposure for AllSeas.
Apart from which, consider what kind of marine spread you will need to dismantle a platform and the time such an operation will take. It's a huge job! I'm involved with a decom. proposal at the moment, and even in shallow waters without DP2 class requirements etc, the costs are staggering!
The PS on the other hand, can pop along to the field, lop the whole topsides off and carry it back to land where the decommissioning can be done infinitely cheaper.
Hence, when you look at the bigger picture, the PS - even at £500k a day or whatever it may be - works out as quite a cost effective solution. I think this was an inspired move by AllSeas. This is exactly the kind of 'pioneering' thinking the industry needs to take it forward into a new era of cost effectiveness - especially on the E&P side.
ninja-lewis said:
Footage of the process uploaded to youtube last week:https://www.youtube.com/watch?v=SLO9uD5Ub_Y
Pioneering Spirit has just lifted the Brent Delta topside off the concrete legs.
http://www.bbc.co.uk/news/uk-scotland-scotland-bus...
Background on the decommissioning project.
http://www.bbc.co.uk/news/uk-scotland-scotland-bus...
Background on the decommissioning project.
I don't work offshore so this is probably bolleaux but I believe the major operators have signed up to some kind of voluntary code which states they'll leave the seabed as they found it, but with the caveat that if they can't, they won't.
I suspect that this caveat will be used quite a lot in future leaving future generations with some interesting engineering problems.
I suspect that this caveat will be used quite a lot in future leaving future generations with some interesting engineering problems.
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