Floating Storage and Offloading (FSO) disconnection, removal and towing
Project overview
Location
Gulf of Thailand
Solution
FSO decommissioning
Intermoor, Acteon’s Moorings and Anchors business line, completed the decommissioning of an FSO vessel, which had been in service for over two decades in 70 m water depth.
Expertise, strong coordination and cost efficiency all around
The decommissioning campaign involved complex offshore operations, including disconnecting and laying down flexible risers and mooring chains, towing the FSO to Singapore, and recovering subsea infrastructure for processing in Thailand.
Challenges included logistical, technical, and operational issues, such as modifying the FSO for safe disconnection, multi-party coordination, tight sequencing, storage limitations onboard the vessel and schedule constraints.
Intermoor's solution involved chartering and managing the marine spread, selecting and mobilising specialist equipment, and deploying experienced personnel. The project was coordinated from Singapore, leveraging local contractors for cost efficiency.
The team minimised decommissioning costs by
- repurposing existing equipment
- optimising deck layouts and chain handling techniques to enable single-trip recoveries
- adjusting vessel movements and scopes to avoid delays
- and minimising environmental impact through proactive waste management and contingency planning.
The result
Intermoor delivered end-to-end support for the FSO decommissioning campaign. This included:
- Chartering and managing the marine spread.
- Selecting and mobilising specialist equipment.
- Deploying experienced personnel to manage complex offshore operations.
This integrated approach ensured safe, efficient execution aligned with the customer’s decommissioning and asset transfer objectives. This marked Intermoor APAC’s first decommissioning campaign and was delivered in parallel with a large-scale pipeline campaign. Early engagement with the customer ensured alignment on objectives and smooth execution throughout the operation.
Related case studies
Discover more decommissioning engineering projects
Case Studies
Seamless pipeline tie-in decommissioning and asset transfer
Case Studies
From mooring to decommissioning with a deepwater FPU
Case Studies
Successful custom CALM buoy disconnection offshore West Africa
Speak to our team
Our team of experts will design a solution that fits the technical, environmental and commercial demands of offshore projects.