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Lifting concept for future offshore wind turbine installation vessel

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Lifting concept for future offshore wind turbine installation vessel

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Samenvatting

This project is about creating a concept that is able to lift and install wind turbines on offshore locations. At the start of this project the specifications for the installation tool and its tasks, in present situations and in the future, were not exactly clear. Therefore the first part of the project was mostly about getting the design criteria (demands and wishes) straight.

The second phase of the project was about brainstorming. Various concepts were thought of, regardless of the fact whether or not they did comply with the design criteria. The designs were then tested for their compliance with the design criteria. The expected weight and sizes of future turbines (expected 8MW) result in the need for a very large installation tool, with a capacity of 1100 tonnes at an outreach of 35 metres. An installation tool of this order has to be specifically designed for the task and will therefore be costly, although the exact costs of these concepts as a whole, or in separate components, are not investigated.

During this phase of this thesis project is became clear that, although there are lots of different installation concepts to be thought of, it is difficult to match the capacity and flexibility of a revolving offshore crane.

The two concepts that scored the highest in their compliance with the design criteria were in fact quite similar. Both concepts used a revolving crane to install the wind turbines, but one of these concepts was rejected. This decision was made because it utilized the well known configuration of a revolving offshore crane, positioned in the centre aft part of the vessel. As this configuration is well proven and often applied, it was decided to work out a more unusual concept during this project.

The remaining concept, with a revolving offshore crane situated around one of the aft jacking legs, was then worked out into more detail. Different aspects of the configuration, dimensions and strength of the crane were addressed and calculated.
Although the concept seems feasible at this point, much will have to be checked or worked out into more detail before it is certain that this concept is a cost effective and practical alternative. Also the vessel itself will have to be investigated before any dimensions or other data can be established.

In general, this report gives an idea of the considerations that apply to the design of a concept such as this. But because the subject has so many interesting facets, only a minor selection of these issues has been addressed during this project.

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OrganisatieHZ University of Applied Sciences
OpleidingWerktuigbouwkunde
AfdelingAcademie voor Technologie & Innovatie
PartnersGusto, Schiedam
Datum2008-01-29
TypeBachelorscriptie
TaalEngels

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