FEED, Concept and Detailed Design

Galloper Wind Farm: Foundation Design

Galloper offshore substation on the move
Galloper Wind Farm consists of 68 turbines located ~27km off the Suffolk Coast
Location: North Sea, UK
Operator: RWE
Duration: 2018
Scope: FEED, Concept and Detailed Design

Galloper Wind Farm is an extension to the UK Round 2 Greater Gabbard Offshore Wind Farm and is jointly owned between Scottish and Southern Energy and RWE.

Kent was responsible for the foundation design of GWF, which consists of:

Front End Engineering Design (FEED). This consisted of the Transition Piece Design and investigation into use of monopiles or jacket structures as foundations for this site. Pre-piled jacket structures were taken forward, leading into a design study before arriving at a suitable jacket structure arrangement for the 5MW Areva turbines.

Basic Design included development of the primary steel design of the pre-piles jacket foundation. The clustering strategy was refined, which considered soil parameters, fabricability, water depths and structural requirements in order to simplify detailed design and formulate a cost-effective approach to producing the wind farm.

In order to provide an optimal solution from both the fabrication and installation perspective and bring economical efficiencies, a detailed clustering strategy was defined. The design was optimised so that only 3 standard jacket clusters were required to cover the full water depth range and soil variability.

The design and analysis methodologies stated in the design basis and design briefs were certified by DNV, the independent verification body for the project.

Detailed Design scope included secondary steelwork/ appurtenances (J-tubes, Boat Landing, Anodes etc.), Grouted connection design. Unfortunately, the Galloper was cancelled midway through the detailed design, but Kent was mid-way through the Coupled Analysis investigation.

Kent completed a fully integrated coupled analysis loop with the turbine manufacturer, being able to streamline the process so that multiple packages could be analysed in parallel. The verification process was of uttermost importance to validate the models and the loading exchanged during the data exchange process.

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