A semi submersible vessel

The semi submersible vessel addresses the inefficiencies of current decommissioning methods by employing a column-stabilized hull design and movable support beams to securely lift and transport large offshore components, improving operational windows and reducing damage risks.

EP3732097B1Active Publication Date: 2026-04-22OFFSHORE DECOMMISSIONING SERVICES LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
OFFSHORE DECOMMISSIONING SERVICES LTD
Filing Date
2018-10-04
Publication Date
2026-04-22

AI Technical Summary

Technical Problem

Current systems for decommissioning offshore infrastructure face challenges in efficiently and safely removing large components like topsides and jackets due to limited operational windows and potential damage during lifting, especially in rough seas.

Method used

A semi submersible vessel with a unique hull configuration and movable support beams allows for stable lifting and transportation of large offshore infrastructure components, featuring a column-stabilized design for improved motion characteristics and a receiving section for secure engagement and separation of topsides and jackets, utilizing winches and cranes for precise manipulation.

Benefits of technology

The vessel provides a robust and efficient method for lifting and transporting offshore infrastructure components, enhancing operational windows in rough seas and reducing the risk of damage, with the ability to handle up to 30,000 metric tonnes and ensuring stable engagement and separation.

✦ Generated by Eureka AI based on patent content.

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Abstract

A semi submersible vessel for manipulating offshore infrastructures, the vessel comprising: a first hull portion; a second hull portion, laterally spaced from the first hull portion; a central hull portion connecting the first and second hull portions; wherein the first hull portion, second hull portion and central hull portion collectively define an open receiving section for receiving an offshore infrastructure or a part thereof into between the first hull portion and second hull portion; and each of the first and second hull portions comprises a plurality of laterally movable support beams arranged to extend from the respective hull portion into the receiving section for supporting an offshore infrastructure or a part thereof; wherein at least one of the support beams of the first hull portion and one of the support beams of the second hull portion comprises a winch system for hoisting part of an offshore infrastructure located in the receiving section. A method of manoeuvring topsides or a part of an offshore infrastructure or installing topsides or a part of an offshore infrastructure using the semi submersible vessel.
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Citation Information

Patent Citations

  • Installation and removal vessel

    GB2156286A