RKB bearings for offshore lifting systems
Bearing applications in lifting systems
A modular offshore lifting system has been developed around a permanent crane-to-tool interface, designed to remain connected to the crane hook throughout operations and to engage installation tools via a fail-safe socket and latch mechanism. This architecture reduces rigging interventions, lowers deck manning requirements, and enhances operational efficiency during the handling of monopiles, jackets, transition pieces, and other large offshore structures.
The system’s engineering scope included structural design, finite element analysis (FEA), and detailed fabrication documentation, ensuring that connection geometry, load transfer paths, and mechanical interfaces comply with the stringent requirements of offshore lifting operations, including extreme axial loads and dynamic conditions.
The lifting system is rated for a working load limit (WLL) of up to 3000 t, corresponding to a maximum permissible load of 3,000,000 kg under defined operating conditions. To accommodate rotational alignment during lifting, the system integrates a heavy-duty RKB cylindrical roller thrust bearing (type 811/1060 MFSPA), with a mass exceeding 340 kg. This bearing is specifically selected to support very high axial loads while enabling smooth and controlled rotation about the vertical axis, facilitating precise positioning of large structural components during installation.
The bearing arrangement plays a critical role in maintaining stability and rotational control under load, particularly during offshore installation phases where environmental forces and tight alignment tolerances are key constraints. RKB technical support contributed to the project through specification validation, definition of assembly tolerances, and on-site assistance during installation and commissioning phases, ensuring optimal bearing performance and integration within the system.
The system has been successfully deployed in a Baltic Sea offshore wind farm project, where units rated at 3000 t were utilised for monopile installation, alongside 800 t variants for turbine tower assembly. Operational results demonstrate improved handling efficiency, reduced installation time, and enhanced safety margins.
By integrating advanced connection design, robust structural engineering, and high-capacity bearing technology, the system provides a reliable and high-performance solution for heavy-duty offshore lifting applications.