Installation of wind turbine at Hywind Tampen

How can you improve the safety of your marine operation crew when installing an offshore wind turbine?

By Niklas Norman og Annette Kristin Brask 14. June 2022

It is feasible to simultaneously improve crew safety and ease installation, maintenance, and repair of floating wind farms. We are bringing a new and innovative mooring solution to the table.

Installing an offshore wind turbine is time-consuming and demands extensive planning and attention to detail. Using traditional mooring methods involves heavy steel chains that are challenging to produce, transport, and install. The high pre-tension and high component weights mean high potential energy. This increases the possibility of severe accidents involving the installation crew or employees in production or transportation.  

Labor and cost-intensive HSE-efforts 

Heavy steel chains and chain components must be transported safely to and from the dock onto specialized vessels to the wind farm's location. If an accident happens, the possibility of it having fatal consequences is proportional to the potential energy involved in the accident. Thus, planning for HSE and making the risk as low as possible demand a lot of time and resources in high-potential-energy operations. 

The solution? We believe the answer to improving crew safety in mooring and marine operations is to migrate to lower component weights and lower pre-tension levels. We suggest mooring the turbines in a new and innovative way, called Honeymooring.  

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Reduced tension means reduced risk 

With Honeymooring, the heavy steel chains are replaced with lightweight ropes organized in a honeycomb structure. The buoys are submerged and taut moored to the seabed. The turbines are moored using ropes connected to the shared taut-moored buoys. Using relatively horizontal mooring ropes instead of steel chains means reduced tension in the system.

We achieve lower pre-tension because of the reduced component weight and the more horizontal angle of the lines hooked onto the floating wind turbines. Furthermore, Honeymooring will enable power cables to be guided through the water column between the turbines, making cable-induced offset criteria less strict, which will ease the pre-tension requirement.  

Free download:  The 7 benefits that make Honeymooring the best option for future wind farms!

Increases the crew's all-round safety

Crew safety is improved since the Honeymooring system has low pre-tension levels and primarily lightweight components. Reduced tension also makes the operations more straightforward and faster for the crew to carry out. Lighter lines are more manageable and easier to handle during transportation.

High tension operations increase the risk involved in deck operation due to the potential energy stored up in the system. Reducing the tension increases the crew's safety onboard the vessels executing installation, heavy maintenance, and decommissioning. 

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Huge gains are possible

The future floating offshore wind farms will consist of large numbers of entities instead of a single production platform for energy production.

With the rapid up-scaling of floating offshore wind farms, there is an urgent need for standardization, simplifications, increased scalability, and, last but not least, increased crew safety related to installation, operation, and decommissioning of the floating offshore wind farms.   

Honeymooring is a solution for station keeping of floating wind turbines developed by Semar to address these industry needs. Considering the development of the marine operations involved in installing and maintaining large wind farms, it is evident that the processes should be kept as simple as possible.

Honeymooring enables solutions that simplify the procedures, reduce marine operation time and reduce hardware cost while contributing to safer marine operations for the crew.

 Do you want more information about the benefits of Honeymooring? Download our free guide 👇

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Topics: offshore wind, Honeymooring, wind farms, sustainable energy, floating wind

Niklas Norman og Annette Kristin Brask's photo

By: Niklas Norman og Annette Kristin Brask
niklas.norman@semar.no

Niklas Norman has had faith in the development of floating wind since he chose it as the theme for his master's thesis in applied mathematics in 2008. After a few years of concept developments and float design in Dr. Techn. Olav Olsen, Niklas has worked with analysis of marine operations and mooring in Semar, where the idea of ​​Honeymooring has been developed and tested. Niklas' ambition is that Semar's contribution to floating wind will be crucial in making it feasible and profitable on a large scale. Niklas has hands-on experience in analyzing the end execution of the installation of Hywind Tampen. Hywind is the biggest floating offshore wind farm in the world. Annette Kristin Brask is a Hydrodynamic Engineer at SEMAR. With Niklas, she was instrumental in installing the Hywind Tampen floating wind turbines, contributing with analysis during the planning phase, and as a project engineer on offshore installation operations. Before joining SEMAR, Annette worked for five years developing and engineering concepts for offshore floating wind turbines and wave energy converters at Marine Power Systems in Wales. She holds a degree in Marine Technology from NTNU with a specialization in Marine Cybernetics.

About the Semar knowledge hub

This blog aims to provide knowledge, learning, and inspiration on topics related to floating offshore wind as a sustainable energy source. Specifically our new innovative solution for mooring floating wind turbines called Honeymooring™. 

 

In addition, we will supply general knowledge and insights into topics related to Semar's other main operations and activities in the oil and gas and aquaculture industry.

 

Visit our company page: semar.no for more information about us

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