PRECISION LIFTING KEY TO RISER CAISSON SUCCESS

“Due to the motions of the waves and the buoyancy of the caisson, the most critical moment was when we lowered the caisson through the splash zone, and then we had to lower it evenly through the water column to avoid excessive stresses in the caisson,” he said.

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.

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 offshore scope was the most challenging, said Mr Granneman.

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.