DECOMMISSIONING
We also had to adapt the SPMT technology to work in this way – it is a world first, after all!
“Alongside the operator, there were 13
other Mammoet professionals placed at specific points around the vessel to monitor progress and communicate with the operator when needed.” As well as putting in place
comprehensive plans, it was critical that rigorous testing was carried out before executing the move. Tis was first completed onshore where the crew tested the full trailer arrangement, and then again on board with Curlew in situ. Tis meant that Mammoet came to site several days before the execution date to ensure this could be done without impacting the schedule. Special pre-engineered fillings were
put between the SPMTs and the FPSO which corrected the deflection of the hull so that the trailers were at the same level to optimise their required stroke. Tese fillings allowed Mammoet to make fine adjustments to keep the huge structure stable and in the correct shape as well to best accommodate the anticipated deflection of the hull.
Ludo Mous comments: “As a team we
have a lot of experience in delivering large scale load-ins, and this background was key to us developing the most effective plan for moving Curlew. But it is always critical to test methodologies in practice wherever possible, and it was particularly important here given such a procedure had never been attempted before. “We needed to test exactly where
and how the SPMTs could best support the vessel, observe how this impacted movement in the hull, and make any necessary adjustments to ensure the move went smoothly.”
SAFE, CONTROLLED DECOMMISSIONING Te extensive planning, engineering work and testing paid off – with Curlew moved on schedule into position for AF Offshore Decom to begin the environmentally responsible dismantling process. As Dorien Frequin observes, the load-in scope has played a key role in achieving this: “Moving an entire 20,300t FPSO from a semi-submersible vessel to a yard was an ambitious goal that had never been completed before – but one that was critical
in allowing AF Offshore Decom to achieve the most sustainable decommissioning programme possible. “We were proud that our expertise was key to achieving this – both in terms of the engineering knowledge to find a safe methodology, and also the incredible operational skill of our professionals on site in executing it accurately.”
The Curlew FPSO was to be transported to Norway
METAL RECYCLING, REUSE AND DECOMMISSIONING SERVICES
• Single Step Environmental Assurance from collection to steel remanufacture
• Processed through renewable energy powered Electric Arc Furnaces to produce low carbon footprint XCarb steel products
• Prioritisation of reuse • Extensive track record supporting onshore and offshore projects • Experienced Project Management & Project Delivery teams • Multiple licensed and permitted quayside facilities
Greenbank Road, East Tullos, East Tullos, Aberdeen AB12 3BQ T: +44 (0) 1224 871844
To find out more email:
info@johnlawrie.com
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