Offshore Foundations | Advances in Rotor Blades
Wind Turbine Towers | Wind Turbine Bearings
26 - 28 August, 2025
| Dorint City Hotel Bremen, Bremen, Germany
Offshore Foundations: Day 2 - 28/08/2025
8:30 - 9:00
Registration and Welcome Coffee
9:05 - 9:35
Status on the development of the new ISO 25249 series of standards, covering Corrosion Protection of Offshore Wind Structures
Birit Buhr -
Chief corrosion engineer,
European Energy
9:35 - 10:05
Chemical emissions from offshore wind farms: from compound identification to risk assessment
David Vanavermaete -
Research Associate,
Flanders Research Institute for Agriculture, Fisheries and Food
• A literature study and leaching experiments allowed to identify more than 200
compounds that can be potentially emitted from offshore wind farms
• Organic, inorganic and particulate contaminants were measured on-field by targeted and
untargeted approaches
• Source identification is essential, as most identified compounds can originate from
multiple sources
• Lack of occurrence and detailed toxicity data hamper a full risk assessment
David Vanavermaete
Research AssociateFlanders Research Institute for Agriculture, Fisheries and Food
10:05 - 10:35
Impact of Corrosion on Welded Offshore Steel Joints over Time: Results of the German CorroFAT project
Sulaiman Shojai -
Group Leader for Structural Integrity,
DLR, Institute of Maritime Energy Systems
• Analysis of weld geometry change based on 3D-scans of up to 12-month corroded
specimens in accelerated salt spray chamber test.
• 3D-scan reveals: With higher exposure durations, the sharpness of butt welds increases,
while it decreases for fillet welds.
• Reduction of fatigue strength with a single reduction factor according DNV do not cover
the physics.
• Fatigue reduction due to corrosion depends on the initial notch category: Highest fatigue
reduction in base material and lowest for fillet welded joints.
• Long term corrosion leads to an equalization effect: mild notches becoming sharp and
vice versa.
Sulaiman Shojai
Group Leader for Structural IntegrityDLR, Institute of Maritime Energy Systems
10:35 - 11:05
Refreshment Break and Networking
11:05 - 11:35
Structural integrity management of Offshore Wind Farm with existing fabrication defects
Dr Jessica Taylor -
Senior Engineer,
Kent
• Fatigue and fracture assessments of over 1500 defects
• Probability of structural failure - which feeds into the safety case
• Ongoing monitoring & inspection requirements
• Lookahead to the future of the wind farm
11:35 - 12:05
Fatigue resistance of non-welded structural details in support structures for wind turbines
Florian Kalkowsky -
Researcher,
Fraunhofer IGP
• Fatigue tests on non-welded structural details as Free Edges, Holes and Openings
• Consideration of the material strength, manufacturing method and post-treatment on the
fatigue resistance
• Classification and derivation of resistance values for fatigue design
• Design recommendations
12:05 - 12:35
Fatigue assessment of circumferential welds – Current discussions
Dr.-Ing. Marc Seidel -
Principal Engineer,
Siemens Gamesa
• Improved S-N-curves by testing
• Thickness correction based on plate thickness, weld width or both?
• The length effect – is it a risk?
12:35 - 14:00
Lunch Break and Networking
14:00 - 15:00
Round Table Session – Choose one out of 4 round tables and discuss with your peers.
14:00 - 15:00
Round Table A Synergies between Towers and Foundations Design
14:00 - 15:00
Round Table B XXL Monopiles – Where is the limit
14:00 - 15:00
Round Table C Supply Chain Considerations
14:00 - 15:00
Round Table D Floating Foundations: Navigating a Landscape of Patented Concepts
15:00 - 15:30
Fatigue life assessment of M72 bolts in MP-TP connections
Ali Mehmanparast -
Professor of Structural Integrity,
University of Strathclyde
Carol Johnston - Technology Fellow - Large Scale Testing, TWI Ltd
• Stress distribution in threaded connections
• S-N fatigue curves for design of threaded connections
• Fatigue test results on M72 studs & bolts
• Mean stress effect on fatigue life
• Other considerations for future research
15:30 - 16:00
State-of-the-Art Virtual Sensing for Offshore Wind Turbines
Johan Toftekær -
Senior Engineer,
Vattenfall
• The derivation of virtual sensing method based only on measured accelerations.
• Separation of translation and inclination contributions to measured accelerations.
• Quantification of the uncertainty of virtual sensing by benchmarking with local strain
gauge measurements.
• Quantification of design load case specific uncertainties.
• Perspectives on the use of virtual sensing for operation, maintenance and lifetime
extension of Vattenfall’s offshore wind fleet
