Session: 09-01-01: Offshore Wind Energy - Installation

Paper Number: 100973

100973 - Estimation for the Efficiency of Offshore Installation Process of Floating Offshore Wind Turbines in Japan 

The offshore floating wind turbines, hereinafter, FOWTs have been developed in Japan and Europe toward the commercialization. Currently, several FOWTs have been installed and operated as pilot projects to establish the technology and reduce the cost of energy. In Japan, as a country with less experiences of offshore oil & gas development, the cost reduction of the offshore installation process is the key to decrease the cost of energy. To estimate the installation cost of FOWTs precisely, it is essential to estimate the offshore installation time for FOWTs. However, there are few studies of installation time for FOWTs on the basis of the installation process of actual projects. In addition, to best of our knowledge, the quantitative analysis of the efficiency of the offshore installation process of FOWTs that have been operated, has not been reported. In this study, the authors propose the offshore installation time estimation model so as to analyze quantitatively the efficiency of the offshore installation process. The offshore installation process can be classified into four subprocesses, (1) pre-anchoring process, (2) holding force verification process, (3) towing process, and (4) mooring process. Thus, the total offshore installation time can be described by the sum of operational time for previous four processes and the other operational processes. The authors introduce the benchmark of installation time per mooring line as a measure of efficiency and analyze the efficiency of the offshore installation process by using the FOWT project data of Japan. It is found that how the total offshore installation time changes qualitatively, when the efficiency of the process and distance from the port changes, by applying the model to the large-scaled wind farm.

Presenting Author: Tomohiro Hasumi National Maritime Research Institute

Presenting Author Biography: Graduated from department of applied physics, Waseda University on 2009.3
Worked at Mizuho Research & Technologies, Ltd., until 2022.3
Worked as a chief researcher at National Maritime Research Institute Japan from 2022.4

Authors:

Tomohiro Hasumi National Maritime Research Institute
Takeshi Yokoi National Maritime Research Institute
Ken Haneda National Maritime Research Institute
Toshiki Chujo National Maritime Research Institute
Toshifumi Fujiwara National Maritime Research Institute