FPSO mooring system using SEPLAs

We conducted a study exploring the use of SEPLAs for permanent mooring of the turret-moored FPSO in its current soil conditions. Based on the study’s conclusions, the client approved and commissioned us to provide and install a new mooring system using SEPLA technology. 

The offshore work was carried out in three distinct phases:  

• installation of nine SEPLA anchors and ground chains
• disconnection and laydown of nine temporary mooring lines
• installation and hookup of the permanent lines and recovery of the temporary anchors for return to shore. 

We delivered the full scope of engineering, project management, offshore procedures, logistics, fabrication of installation equipment, and offshore personnel.  

Each of the nine 28-te SEPLA anchors, among the largest ever fabricated, was custom-designed to accommodate 157-mm mooring chain. The anchors were embedded using a reusable suction follower, enabling consistent installation depth, precise embedment and efficient, safe, operations. The Maersk Maker and Maersk Achiever vessels were used to execute the offshore phases.

The SEPLAs were installed using a retrievable suction follower, reducing cost and enabling reuse. The anchors were customised for high-load chain compatibility and embedded deeply for optimal performance. Anchor handling vessels were used to reduce operational expenditure.