Publication Abstract

Proceedings of the 45th Annual Conference on Deep Foundations, 2020 - ONLINE , (DFI)

Cost Analysis of Multiline Ring Anchor System for Offshore Wind Farm
Junho Lee, Mohammad Khan, Leopoldo Bello, Charles P. Aubeny

Multiline ring anchor (MRA) was developed as a cost-effective solution for securing floating offshore wind turbines (FOWTs) to the seabed. Since FOWTs are placed in arrays compared to conventional oil-gas platforms, the availability of multiple mooring lines attached to a single anchor can make FOWTs economically competitive. Additionally, the MRA can provide a small and light-weight anchor with high resistance to mooring line loads due to its deep embedment depth. The combined benefits of fewer and smaller anchors allow substantial reductions in anchor material, transport, and installation costs. Such cost reductions are critical to reducing foundation costs for the wind turbine, which can comprise well over 25% of the capital costs for offshore wind power development. Since it substantially reduces the required number of anchor footprints, the multiline anchor concept also permits significant reductions in seabed site characterization costs. This study evaluates how potential advantages of the MRA can reduce the capital costs and provide a reliable cost analysis of the foundation component for offshore wind farms.

 article #3701; publication #1073 (AM-2020)