offshore wind turbine foundation monopile cp retrofit · pdf file– cathodic protection...
TRANSCRIPT
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Offshore Wind Turbine Foundation
Monopile CP Retrofit Options
Deepwater Norway AS
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Environmental Variables Internal
• Conditions – Partially filled with Static Seawater – Mixture of atmospheric and submerged – Sealed conditions or are they??
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Design Codes
– DNV (Det Norske Veritas) Certification – DNV OS-J101 Design of Offshore Wind Turbine Structures – Early versions a bit vague on corrosion protection – Later revisions of OS-J101 included improved corrosion
protection/ monitoring – Cathodic Protection refers to DNV-RP-B401
• is this applicable??
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• Need to minimise any retrospective activities • Working inside is very difficult • Need to Consider overall Solution including the
installation • Not just about the material costs
CP Retrofit
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Internal CP Systems - Monopiles
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Sacrificial Anode Retrofit
• RetroLink • Simple suspended anode
solution, • Designed and engineered for
durable service • Can be customised
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Up the Ladder
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Vessel to Turbine Lift
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Through the Door
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And Down Again
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Assembling Anodes on lower deck
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Ready to Lift Anodes
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Lowering of String
Total Anode Lift
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Insert Rope
• Very Expensive • Stainless rope difficult to cast • Over-potential issues • Does not solve corrosion issue necessarily
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Monitoring
• Current • Current Density • Hydrogen • Oxygen • Temp./RH
Potentials
Hydrogen
Remote Monitoring