FPSO Independence Cold Work Repair


Project Type

Reinstatement/Cold Work Repair of hull


In-situ, Ukpokiti Field, Nigeria


October 2003





Excessive pitting corrosion of the bottom shell plating in the Cargo Oil Tank resulted in the FPSO Independence requiring local steel reinstatement, which was solved with an SPS Cold Work repair. The Independence processes around 20,000 barrels of crude oil each day, an important factor when choosing the method of repair.

The FPSO Independence repair was carried out on-station. The repair area was localised and required only one tank to be closed, enabling FPSO Independence to maintain 100% operational capacity throughout the project, which took less than two weeks to complete.

The Cold Work version of SPS delivered a permanent repair, reinstating the existing hull and creating a new composite section. SPS Technology has a solution that uses structural adhesives to join the steel components and form airtight cavities into which the elastomer core is injected. This design and process was evaluated and is approved by ABS.

Conventional in-situ repairs of this sort are slow and expensive while limiting the ship’s operating capacity.  Repairs using SPS remove the need for divers and cofferdams, cleaning, gas-freeing and venting the adjacent cargo tanks. Repairs using SPS are faster, safer, sustainable and last the lifetime of the vessel. A proven technology, Sandwich Plate System has been in use for over twenty years and is approved by all major Classification Societies.

The SPS Technology Surveyor’s Pack, available for download on our Maritime and Offshore pages, provides owner, operators and contractors up-to-date information related to SPS installation as well as Classification Society approvals. Our Cold Work Guidance Notes are also available for download. We have more projects like the FPSO Independence Cold Work Repair in our Projects section.

Independence is the first SPS project using our cold work solution. It’s an excellent example of how we provide offshore vessels with repair solutions that allow them to remain on station and minimise disruption.

Martin BrookingEngineering Design Director, SPS Technology