Study on various types of potential fleets that can serve decommissioning of offshore wind parks

08 April 2021 - Published by Charlotte Lundsberg Baumgartner

Study has been conducted on various types of potential fleets that can serve decommissioning of offshore wind parks.

The findings indicates that among all types of vessels, the DP crane vessel is the most independent vessel in the sense that it does not necessitate another marine spread for operation. To put it simply, the DP crane vessel can commence the operation as soon as arrival to the field and conduction of DP trial. However, if a jack up vessel either the DP jack up or non-self-propelled jack up vessel is planned to be utilized for disassembly of the wind farm components, the seabed needs to be surveyed and for each wind turbine the jacking and positioning of the jack up vessel need to be performed. These preparatory activities affect the offshore duration, fuel consumption as well as impact the environmental footprint. However, the stability of the floating vessel is inevitably influenced by external forces such as wind, wave and current whereas the workability of the jack up vessel is just impacted by wind after positioning and reaching the desired airgap.

Furthermore, preliminary results of conducted study on the diverse logistic configuration reveals that the pendulum configuration for the decommissioning of offshore wind parks is not as much as efficient with respect to the feeder configuration in terms of offshore duration, the cost and emission. Nevertheless, the efficiency of the feeder configuration heavily depends on the specification of the crane vessel, feeder vessel as well as specification of the offshore wind farms.

Read the report here

 

At the end of April, an internal project workshop will be held to discuss and evaluate the first simulation models of the different logistics systems and dismantling-strategies including their results. More about this in the next newsletter.