Scope

• Detailed design of a mechanical and electrical swivel used to connect a WEC to a three point mooring.

• Definition of load-cases for extreme events

• Weld-overlay specification

• Full fatigue analyses for all major components

• Annode design and integration into the system

• Shackle selection and a flexible approach to supplier selection

• Umbilical termination geometry definition for a range of power options

Project Summary

Design of a swivel that could take the loading of the WEC device with sufficient safety factor to endure more arduous conditions.

Work included detailed design, bearing selection and wear calculations, detailed FE analysis to confirm hand calculations as well as define deflections. The design is compatible with 3-point mooring configurations. The main objectives were to improve reliability, safety, and future-proofing for offshore deployment.

Ultimate Limit State (ULS) and Accidental Limit State (ALS) loads calculated per DNVGL standards. Finite Element Analysis (FEA) conducted for five critical load cases, including peak shackle loads, side-pull, ALS, and lifting scenarios.

Design for Assembly – Assembly planning and tightening procedures drawn out to ensure correct bearing preload and secure locking and redundancy.