lars bo ibsen, aalborg university, professor. - sintef · lars bo ibsen, aalborg university,...
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• Foundation concepts for offshore Wind Turbines
• The Universal Foundation
• Carbon Trust Foundation Competition
• Conclusion
Lars Bo Ibsen, Aalborg University, Professor.
Monobuckets and the competitiveness versus monopiles and jacket structures.
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Structural and foundation for Wind Turbines but also applicable to other offshore renewable
Cost of energy
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Foundation concepts for offshore Wind Turbines Shallow depth 5-10m
• Gravity based
– Fabrication/material costs are low (concrete)
– Limited water depths (5-10m)
– Possible to float out
– Vulnerable to soft soil – erosion & scour
– Sea bed preparation necessary
– Ice-cone usually integrated in design
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• Mono piles
– 75% of all wind parks today
– Simple fabrication with welded steel pile
– No preparations of the seabed are necessary.
– Requires heavy duty piling/drilling equipment
– Not suitable for locations with many large boulders in the seabed.
Foundation concepts for offshore Wind Turbines Shallow depth 10-30m
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Noise • The recommended requirements of
maximum: 160 dB SEL and 190 dB Peak for underwater pile driving noise levels.
• So far, Germany is the only country having ratified the legislation, but the remaining EU countries are expected to follow Germany’s example.
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• Jackets and Tripod
– Suitable for larger water depths.
– Minimum of preparations are required at the site before installation
– Complex welded main structure
– Known technology from oil & gas industry
Foundation concepts for offshore Wind Turbines Depth 30-60m
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Foundation concepts for offshore Wind Turbines Depth 30-60m
Tripod
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Offshore wind turbine foundations
Platform Bucket Mono pile Tripod/jacket
The flexibility of the bucket foundation gives wider range of application.
Sites with complex geotechnical properties can be cover by a single foundation concept
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The Bucket foundation
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Universal foundation solutions
Variation in water
depth
0 - 60 m
Variation in seabed properties
Hard clay, soft clay, sand, silt
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Vision for Installation in 2001
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Universal Foundations – Solution Provider
Universal Foundation A/S
Fred.Olsen
Dong Energi
Novasion
Aalborg University
2011 - MBD Offshore Power A/S -> Universal Foundation A/S
Universal Foundations - Concept IP Holder
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OBMC 2011 November 7th 2011
Transport / Installation • Buoyant horizontal wet tow/ vertical a/o horizontal on jack-up or crane ship /
purpose build vessel
• Snap-on pump unit interfacing the lid
• The structure is upended by ballast water or by crane
• Crane is hooked on to stabilize touch down
• After initial penetration, suction is applied
• Installation is finalized by void filling by injecting cement slurry under the lid if needed.
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The Ø12x6 m prototype bucket foundation was designed for a Vestas V90 3MW turbine placed on 4 m of water. The design is certified by DNV. The bucket was installed in late 2002 and is in normal operation. The structure/soil interaction has been investigated with sophisticated modal analyse equipment.
Reference 1: Pos. 1-Frederikshavn in operation 9 years
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The bucket foundation technology
Installation advantages: • Minimum noise impact. No pile driving hammers or drill
drives are used • No grouted connections • Minimum disturbance to the existing seabed • The use of excess material for scour protection is reduced or
not necessary • All steel materials can be recovered from the seabed and
reused / recycled when the foundation is decommissioned
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Monobuckets - competitiveness versus Monopiles
• Reduced steel consumption • Use of simple geometric welded steel structures suitable for mass production • Few offshore operations, with utilizing smaller equipment/vessels during
installation • No seabed preparation and no or reduced need for scour protection • No transition peace - Adjusting the upper part of the shaft to fit the standard
wind turbine tower. • Simple decommissioning • Cost is reduktion 20%.
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"The Mobile Met Mast" is a prototype of a bucket foundation designed as support structure for a met-mast. Purpose: To gain confidence that a
monopod bucket foundation can be successfully installed offshore.
To obtain a movable met-mast, which can be used in several offshore wind farms.
Specification Total height: 34 m Weight: 165 tones Skirt length: 6 m Skirt diameter: 12 m Fabricated in Aalborg in August 2008. Installed at Horns Rev 2 Offshore wind farm in March 2009.
Reference 2: The Mobile Met Mast Horns Rev II 2009
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Launching
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Site for installation
The Mobile Met Mast 3 installation tests were
planned at different locations. (depending on weather)
Was only installed on the final location.
No data from CPT or borings are available (yet)
Horns Rev 1
Denmark Horns Rev 2 Wind turbines: 91 Siemens 2.3MW 200 MW
Scheduled installation: - 2008: Foundations - 2009: Turbines
Esbjerg
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Float out to site
Floated to site using 2 tug boats
40 m3 water was pumped into the head of the Mobile Met Mast to ensure a horizontal orientation when floating.
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Up-ending procedure Up-ended with M/S SeaPower by A2SEA.
The lift was performed with a heave-compensator.
Inflation/deflation of air to the bucket skirt was necessary
during up-ending
Water depth (15 m) was close to the lower limit – only 1 meter water below skirt during up-ending.
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The Mobile Met Mast Offshore installation Horns Rev II 2009
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Installation A penetration velocity
of 2 m/hour. Tilt after 2.5 m
penetration. At 4 m penetration, the
process was reversed until 3 m penetration, and suction process reengaged
The foundation was successfully installed with a 0.1 degree inclination out of vertical.
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Carbon Trust Foundation Competition
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The Challenges
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Stage I: Foundation Designs total 72
• Fixed prices
• Two turbine: 3.6 and 5 MW
• Water depts: 35m, 45m and 55m
• Two see condition Aver. and Exp.
• 6 seabed profiles
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35 Buckets – a wide-ranging foundation solution OBMC 2011 November 7th 2011
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Cases: Carbon Trust Wind Accelerator Project
Water depth 5 m 15 m 25 m 35 m 45 m 55 m
Moment kNm 127.000 156.000 196.700 255.000 300.000 350.000
Bucket size m Ø14x11 Ø15x12 Ø16x13 Ø17x14 Ø17x15 Ø17x16
Weight tons 295 392 503 640 780 952
Moment kNm 355.000 405.000 480.000
Bucket size m Ø18x15 Ø18x16 Ø18x17
Weight tons 760 920 1080
3,6 MW
5 MW
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Dogger Bank, data from Carbon Trust OWA study and met mast project.
Loads Bucket foundation MNm *)
Water Depths 25 35 45 55
Loads 3,6 MW turbine 338 292 356 393
Loads 5 MW turbine 461 413 489 538
Reference jacket 3,6 MW 380 478 516
Reference jacket 5 MW 443 542 584 *) breaking waves
200
250
300
350
400
450
500
550
600
650
25 35 45 55
Mo
en
t lo
ad, M
Nm
Water depth
Dogger Bank,Foundation loads at seabed
Loads 3,6 MW turbine
Loads 5 MW turbine
Reference jacket 3,6 MW
Reference jacket 5 MW
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Comparison of Foundation Types
Basis of Comparison - Tenders for Manufacture of 80 No. Foundations
Foundation Type Steel Weight (Gross) each Cost % comparison
Tripod 1453 1.00
3-Leg Jacket 1394 0.96
4-Leg Lightweight Jacket 1170 0.84
Universal Foundation 992 0.50
Comments
Note to balance the cost, Insurance, Bonds and Guarantees have been removed, where appropriate, as these were not applied equally to all tenders.
Where service cranes were required to certain types, these have been removed
Load out and transportation has been removed, where appropriate
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Fred.Olsen & Co /
Support by way of
• Legal
• Accounting
• HR
• Finance
Client
Contract
The Supply Chain
Fred. Olsen United AS
CablingWind turbine
Project
developmentFabrication InstallationTransport Operation
Universal Foundation Solution Supplier
Concept IP’s / Configuration / Contract Management / R&D
Document / Material Flow
Design / Methodologies / Procedures / Feed-back
Universal Foundation Document SupplyBuckets – a wide-ranging foundation solution
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Conclusion
Monobuckets - competitiveness versus Monopiles • Reduced steel consumption compared.
• Few offshore operations, with utilizing smaller equipment/vessels during
installation.
• No seabed preparation and no or reduced need for scour protection.
• No transition peace - Adjusting the upper part of the shaft to fit the standard wind turbine tower.
• Simple decommissioning.
• Reduces cost of energy by reducing foundation cost by 20%
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• Reduced steel consumption compared to any other substructure solution.
• Use of simple geometric welded steel structures suitable for mass production.
• Few offshore operations, with utilizing smaller equipment/vessels during installation.
• No seabed preparation and no or reduced need for scour protection.
• No transition peace - Adjusting the upper part of the shaft to fit the standard wind turbine tower.
• Simple decommissioning.
• Cost reduktion 30-50%.
Monobuckets - competitiveness versus Jackets
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Thank you for listening
Lars Bo Ibsen
www.civil.aau.dk