Jumbo Offshore completes the transportation and wet storage of a riser caisson for Technip FMC

Jumbo Offshore has completed the transportation and wet storage of a riser caisson for Technip FMC. Jumbo carried out the job in October, deploying its heavy-lift vessel Fairplayer to handle the 120-metre long and 1.3-metre diameter caisson, according to the company's release.

The Fairplayer picked up the caisson from the Scottish port of Nigg, an operation that demanded a finely-tuned rigging arrangement due to the high flexibility of the caisson. To this end, each of the Fairplayer’s 900-tonne cranes used double slings and a total of five connection points.

After transporting the caisson to the offshore location, Jumbo then executed the wet storage scope of the project. Wet storage is the temporary storage of offshore components on the sea bed, which in the case of this particularly delicate caisson, called for careful operations.

The preparatory engineering of this project is also notable. Having worked together on numerous occasions in the past, Technip FMC and Jumbo Offshore have a good working relationship. For this riser caisson project, the two companies worked together on the project engineering. Technip FMC carried out the calculations for the rigging, and Jumbo worked on the vessel-specific calculations regarding the Fairplayer’s movement at different phases of the operation.

Once positioned on the seabed, Jumbo used an ROV to disconnect the caisson, leaving two rigging points in position to allow Technip FMC to pick it up for installation at a later date.

Jumbo Offshore is a privately owned company, part of the Jumbo Group, with a state-of-the-art and versatile fleet of specialised offshore installation and transportation crane vessels operated worldwide in both the Renewables and Subsea & Offshore industries. Jumbo Offshore is a flexible and client focused installation contractor, providing clients with robust, efficient and thoroughly engineered transport and installation solutions.