A Method for the Hooking of Floating Monopiles

Master thesis (2022)

Authors

H.J. van Gelder Mechanical Engineering

Contributors

P.R. Wellens Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering (mentor)
A.D. Boon Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering (graduation committee member)
P. de Vos Ship Design, Production and Operations - Mechanical, Maritime and Materials Engineering (mentor)
Faculty
Mechanical Engineering, Mechanical Engineering
Copyright: © 2022 Hidde van Gelder
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Published Date

08-02-2022

Language

English

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Faculty

Mechanical Engineering

Abstract

To facilitate the installation of larger monopiles multiple players in the offshore wind market are investigating the floating transport of monopiles to installation locations. This brings the challenge that when these floating monopiles are to be installed by heavy lift vessels, they must safely be handed over to the installation vessel and hooked onto the main crane of the installation vessel for installation. Current literature mainly focusses on two topics. Some studies exist on the behaviour of a floating monopile near a heavy lift vessel. Studies also exist that study the behaviour of a monopile hanging on the crane of a heavy lift vessel. The step between these two moments in time, where the floating monopile is handed over from the tug towing the monopile to installation vessel, is the focus of this study. This thesis presents a method for the hooking of a floating monopile to the crane of heavy lift vessel Oleg Strashnov and a model for the hooking operation. This model is used to determine a maximum allowable sea state for this operation. Two methods for hooking a floating monopile to the crane of a heavy lift vessel were defined. In the first option, the monopile would be moored alongside the vessel and kept in position by a supporting tug while the rigging is handed over to the heavy lift vessel and the rigging can be hooked onto the vessel crane. The second option entails positioning the monopile perpendicular to the heavy lift vessel, with fenders placed between the monopile and vessel...