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Author Topic: Blyth offshore windfarm  (Read 874 times)
stannn
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« on: July 12, 2017, 07:56:32 AM »

http://www.theconstructionindex.co.uk/news/view/first-blyth-turbine-base-sets-sail
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dan_b
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« Reply #1 on: July 12, 2017, 08:14:30 AM »

Interesting installation method
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biff
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« Reply #2 on: July 12, 2017, 09:35:31 AM »

!.800 cube of concrete is a big amount for each one,
and then it says 15,000 ton..those figures do not add up, unless they are adding the weight of the steel to the final figure,
We have wagon here that carry 8.5 meters on our roads, that is supposed to be a pay load of some 45 ton, Mind you they are acting illegally and only use the roads at quiet times. The roads roll like a wave in front of the trucks and only the most experienced drivers deliver that kind of final load.
 15,000 divided by 1800= 8.3 ton per cubic meter freeze  So they must be adding the steel to the final figure.........naturally enough.
  It is a great idea and hopefully it will work out. It means that most of the work can be done in dry dock under strict supervision and that is no bad thing.
and they can work right round the clock in all weather,, This has to be good.
                                                    Biff                   
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smegal
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« Reply #3 on: July 12, 2017, 09:43:32 AM »

!.800 cube of concrete is a big amount for each one,
and then it says 15,000 ton..those figures do not add up, unless they are adding the weight of the steel to the final figure,
We have wagon here that carry 8.5 meters on our roads, that is supposed to be a pay load of some 45 ton, Mind you they are acting illegally and only use the roads at quiet times. The roads roll like a wave in front of the trucks and only the most experienced drivers deliver that kind of final load.
 15,000 divided by 1800= 8.3 ton per cubic meter freeze  So they must be adding the steel to the final figure.........naturally enough.
  It is a great idea and hopefully it will work out. It means that most of the work can be done in dry dock under strict supervision and that is no bad thing.
and they can work right round the clock in all weather,, This has to be good.
                                                    Biff                   

This may explain the extra weight

"weighs more than 15,000 tonnes when installed on the seabed"

"extra ballast will be added ahead of their tow-out to the offshore wind farm site."

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biff
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« Reply #4 on: July 12, 2017, 10:03:25 AM »

Ooooops Smegal,
              You are right. facepalm
                           Biff
           
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skyewright
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« Reply #5 on: July 12, 2017, 05:16:40 PM »

Interesting installation method
Somewhat reminiscent of the big concrete North Sea oil platforms?
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David
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stannn
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« Reply #6 on: July 13, 2017, 09:25:28 PM »

This is a movie, over 3 years old, showing how gravity base foundations would be made and installed. Construction has since moved to the Tyne where casting and assembly is carried out in dry dock, so that the foundations can be floated into the Tyne and the North Sea. From stills that I have seen in dry dock this is probably close to the final design.
https://www.bing.com/videos/search?q=blyth+wind+farm&&view=detail&mid=CD58D6C52B1780050B8ACD58D6C52B1780050B8A&FORM=VRDGAR
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djh
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« Reply #7 on: July 13, 2017, 09:48:26 PM »

"The first turbine foundation for the Blyth offshore wind farm has begun its journey up the River Tyne on route to its final destination."

Whoever wrote the headline was obviously not a mariner! The idea of going upstream to the sea boggles the mind (except somewhere like Norfolk perhaps).
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biff
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« Reply #8 on: July 13, 2017, 11:09:54 PM »

Really interesting little film Stann,
                    Explains it all in fine detail.
                                       Biff
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stannn
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« Reply #9 on: July 27, 2017, 09:23:40 AM »

http://www.owjonline.com/news/view,blyth-project-highlights-benefits-of-technology-and-early-surveys_48575.htm
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stannn
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« Reply #10 on: July 31, 2017, 02:51:50 PM »

https://www.offshorewind.biz/2017/07/31/first-blyth-gravity-based-foundation-installed-second-up-next/
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« Reply #11 on: August 01, 2017, 08:01:12 AM »

"The foundation design utilises ‘self-installing’ technology"  which i presume means they float it out and sink it.  Following this on then why not make the whole thing,blades and all, and float it out with the blade end supported on a ship and then sink the base and hey presto.
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skyewright
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« Reply #12 on: August 01, 2017, 09:33:43 AM »

"The foundation design utilises ‘self-installing’ technology"  which i presume means they float it out and sink it.  Following this on then why not make the whole thing,blades and all, and float it out with the blade end supported on a ship and then sink the base and hey presto.
I'm no expert, but my guess is that the issue would be the significant potential for differential movement in several dimensions between the ship & the base throughout the prepare/float/tow/release process even in the flattest calm, resulting in stresses on the blade that it's just not designed for?
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David
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stannn
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« Reply #13 on: August 01, 2017, 11:25:26 AM »

At more than twice the height and with an enormous mass at the top, the system would have a very low roll frequency. I'm sure that wave action would soon cause it to turn turtle during tow. Once resting on the seabed as designed, new reactions to weather forces come into play.
Stan
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« Reply #14 on: September 13, 2017, 10:18:22 AM »

https://www.insidermedia.com/insider/northeast/milestone-reached-on-blyth-wind-farm

http://www.4coffshore.com/windfarms/blyth-offshore-demonstrator-project---array-2-united-kingdom-uk70.html
« Last Edit: September 13, 2017, 11:56:23 AM by stannn » Logged

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