Heavy LIft Construction Vessel Seven Borealis

Heavy LIft Construction Vessel Seven Borealis

Author
Discussion

Lefty

16,132 posts

201 months

Thursday 7th July 2016
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The PS:


ninja-lewis

4,226 posts

189 months

Saturday 27th August 2016
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anonymous-user

53 months

Sunday 28th August 2016
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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?

Krikkit

26,500 posts

180 months

Sunday 28th August 2016
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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?
Quite a good video on this page: http://allseas.com/equipment/pioneering-spirit/ (Past the "technical design" section, the one that says "moment of fast lift" on the thumbnail).

Basically the lift is done from pivots on the end of the cross-arms which are hydraulically stabilised. Clever stuff.

Steve_D

13,737 posts

257 months

Sunday 28th August 2016
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First lift was likely priced as a 'loss leader'.

Steve

tenfour

26,140 posts

213 months

Monday 29th August 2016
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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.

Martin4356111

Original Poster:

118 posts

145 months

Monday 5th September 2016
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Just came back from out holiday in the UK and Seven Borealis has gone from Limassol. According to vessel finder it left at the start of August and is in the Libra oilfield, just off the coast of Egypt.

Almost 8 months static, can't have been cheap.

ninja-lewis

4,226 posts

189 months

Monday 10th October 2016
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ninja-lewis said:
Footage of the process uploaded to youtube last week:

https://www.youtube.com/watch?v=SLO9uD5Ub_Y

ninja-lewis

4,226 posts

189 months

Friday 28th April 2017
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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.

Condi

17,089 posts

170 months

Saturday 29th April 2017
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Surprised they will be allowed to leave the legs there. Surely they have to leave the seabed as close to natural as possible?

DJFish

5,917 posts

262 months

Sunday 30th April 2017
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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.

Power Junkie

83 posts

224 months

Tuesday 2nd May 2017
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I was offshore on the Maersk Highlander last week and the Seven borealis is the Pipe laying ship working along side, it looks huge and quite impressive.