Integrity And Corrosion Of Offshore Wind Structures

Integrity and Corrosion Of Offshore Wind Structures

Day 1 - Tuesday 3 June 2014

Registration And Morning Refreshments


Chair’s Opening Remarks

Brian Wyatt, Past President, Institute Of Corrosion (ICORR)


Keynote Address
50 Years Of Offshore Oil And Gas Corrosion Control Experience: Transfer Of Technology To Offshore Renewables

Trevor Osborne, President, Institute Of Corrosion (ICORR)

Cathodic Protection Of Offshore Wind Foundations: Do The Developers Contract For What They Need? Do The Classification Societies Assist Or Hinder?

Brian Wyatt,  Past President, Institute Of Corrosion (ICORR)



Reliability Of Corrosion Monitoring Measurements

• Performance criteria for cathodic protection
• Monitoring methods: drop cell and stabbing cell
• Corrosion coupons: do they reflect real life situations?
• Future advancements for corrosion monitoring

Birit Buhr Jensen, Lead Corrosion Specialist Offshore Design,
DONG Energy


Networking Break And Morning Refreshments


Structural Integrity Monitoring of Monopile Foundations

• Monitoring corrosion using weight loss coupons and ER probes
• Internal corrosion and issues associated with changes in pH levels
• Managing the performance of corrosion protection systems
• Grouted connection integrity monitoring systems by use of strain gauges, displacement sensors and accelerometers

Teit Schoenberg, Package Manager, RWE


Examining The Correlation Between Fatigue And Corrosion

• Differences between corrosion rates and fatigue effects
• Fatigue calculations in the wind turbine industry
     -no corrosion
     -free corrosion
• Ongoing investigations on SN curves
     -corrosion effects on fatigue
     -how do we apply the results in the design?
• The fatigue effects dependent on corrosion type (general/pitting)

Jens B. Gjerding, Chief Structural Engineer, DONG Energy


Performance Of ICCP Systems In Offshore Wind Farms 

  • Introduction to Corrosion
  • ICCP projects gained in offshore wind 
  • ICCP basic knowledge
  • Design parameters For Greater Gabbard Windfarm 
  • ICCP design by numeric simulation
  • Monitorig and controlling solutions from shore
  • Performance of ICCP at actual windfarms and substations
  • Performance of ICCP versus standards
  • Internal protection
  • OPEX and CAPEX including risk analyses 

Frits Verbruggen, Chief Field Sales, Corrosion 


Networking Lunch 


Installation Factors For Anode Retrofit Systems 

  • Front end design versus retrofit design options 
  • Challenges involved in determining whether or not to fit internal CP
  • Logistical considerations when working offshore
  • Safety considerations during installation and the use of divers
  • Secondary issues

Ben Simpson Offshore Project Engineer, RES Offshore

Alex Delwiche, Engineering Manager, Deepwater EU Ltd.



Case Study
Internal And External Corrosion Monitoring Of Steel Monopiles  

As more offshore wind turbines have been installed, it has become increasingly apparent that corrosion protection of the steel monopile is important and has not been fully addressed in the past. There have  been difficulties on both the outside and inside surfaces of the monopile. The inside surface poses particular difficulties in preventing further corrosion. The various practicable approaches will be examined such as water treatment and cathodic protection (CP). The three possible types of CP will be examined in respect of their effectiveness and their effects on the water chemistry. Finally an automated system for logging water chemistry at various depths will be introduced and explained.

Dr. Paul Chess, Corrosion Engineer,   FORCE Technology



Design Requirements Versus Integrity Management

• Design decisions that impact integrity management
• What safety level do we need? How much inspection do we need?
• Corrosion and fatigue design: are we dealing with this in a rational manner?

Marc Seidel, Leading Expert Offshore Engineering, Senvion


Networking Break And Afternoon Refreshments 


Integrated Structural Analysis Of An Offshore Met- Mast On A Monotower Foundation

• Structural model (steel and soil)
• Wave loading for strength and fatigue
• Wind loading for strength and fatigue
• Dynamic response
• Results and lessons for future met masts

Robert Addlesee, Global Technology Leader For Fixed Structures , Lloyd's Register Energy



Selecting Cathodic Protection Systems For Corrosion Prevention Inside Monopiles

• The advantages and disadvantages for impressed current systems versus galvanic anode cathodic protection systems
• Mitigating the risks associated with cathodic protection such as:
     -the production of hydrogen
     -the production of chlorine and oxygen
     -water chemistry changes
• Reliability, maintenance and life
• Supply chain issues
     -design and specification
     -installation supervision
     -performance data collection and intervention

Dr. Robin Jacobs, Independent Consultant (Cathodic Protection)


Chair’s Closing Remarks


End Of Day One