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An investigation into the use of load reduction devices integrated with high-modulus synthetic mooring lines for semi-submersible station keeping
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An investigation into the use of load reduction devices integrated with high-modulus synthetic mooring lines for semi-submersible station keeping
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An investigation into the use of load reduction devices integrated with high-modulus synthetic mooring lines for semi-submersible station keeping
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Journal Article
An investigation into the use of load reduction devices integrated with high-modulus synthetic mooring lines for semi-submersible station keeping
2024
Overview
Floating offshore wind (FOW) requires cost reduction to compete with fixed offshore wind, and other traditional and renewable energy sources. One major cost contributor in FOW is the mooring system. Volume effects are expected to deliver significant savings for most cost drivers, but moorings are already produced at scale and at volume for the oil and gas sector, and innovation is required to address the specific challenges of FOW. This paper investigates the use of Dublin Offshore’s load reduction device (LRD) integrated with high-modulus synthetic mooring lines in an inclined taut mooring (ITM) configuration for semi-submersible station keeping. The ITM comprises a 3-line array with vertically loaded anchors within a reduced mooring footprint, fully synthetic Dyneema® DM20 mooring lines, and optimized system compliance provided through an in-line LRD on each mooring line. The ITM allows mooring designers to significantly reduce component count, risk of failure, CAPEX, and lifetime cost of the mooring system. Wave tank testing was carried out at 1:60 scale using a variant of the TetraSub, a market-ready 15 MW semi-submersible FOW platform, developed by Stiesdal Offshore Technologies (SOT) at the Offshore Basin in MARIN in Q3 2021. The experimental results of wave tank testing presented in this paper demonstrate the feasibility of the innovative ITM mooring configuration. In addition, good agreement is observed between LRD quasi-static performance and each of the numerical analysis in OrcaFlex, and the wave tank testing results.
