Dan Dolan. Presentation-Offshore Platform Technology
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Offshore Platform Technology
Dan Dolan
MMI Engineering
Oakland California
Offshore Platform Technology
Current offshore wind power platforms
The application of offshore oil and gas
technology to offshore wind
Current efforts on the development of
design standards for offshore wind
Definitions
Waterline
Mudline
Support
Structure
Tower
Substructure
Foundation
Current Practice - Monopiles
Most widely used
Very simple design
Installations up to 16 ft
diameter
Driven or drilled into place
Lateral load capacity is
limited
Performs best in shallow
water
– Sites in 65 ft water depths
Horns Rev
Current Practice – Gravity Base Structures
Fewer existing applications
Steel or concrete
Provides some additional
installation options
Seabed preparation is
required
Scour can be a problem
Overturning is resisted
through weight
Performs best in shallow
water
- Sites in 30 ft water depth
Nysted
Current Practice – Jackets
Beatrice
Fewest existing
applications
Multiple, smaller piles
More complex design
and fabrication
Strong and stiff
Can be used in
deeper water sites
Current Distribution
Offshore Wind Farm Installations
0
5
10
5 1015202530354045
Water Depth (m)
Number
Concept Selection
Concrete
Monopiles
Bottom
Founded
Gravity Base
/Mat
Foundations
Pile Founded
Self Floating Lift Installed
Multiple Pile
Systems
Braced
Caissons
Jackets
Compliant
Towers
Steel
Floating
Tension Leg
Platform
Centenary
Moored
Spars Calm Buoys
Bottom
Founded
Floating
Floating Concepts
Many hull shape and mooring
alternatives
Applicable to deep water sites
Extends reach well beyond
bottom founded concepts
– Eliminates view-shed issues
Potentially lower CAPEX cost
Sea keeping and rotor sensitivity
to motion are key issues
Ref Drijftwind
Range of Concept Applicability
Monopiles
Jackets
Floating
Systems
Transition
Depths
Cost
Water Depth