InterMoor has completed the final tensioning and chain-cutting operations on the Turritella floating production, storage and offloading (FPSO) vessel for Shell’s deepwater Stones project in the US Gulf of Mexico (GoM).
The project is located in the Walker Ridge protraction area.
The FPSO will connect to subsea infrastructure that lies 9,500ft deep.
Turritella arrived in January this year, and is a disconnectable turret moored FPSO and has nine mooring lines that comprise chain and polyester.
Each mooring leg has an in-line mooring connector (ILMC) tensioning system, located 900ft below the surface that was pre-tensioned after connection to the buoyant turret mooring (BTM).
Upon arrival of the Turritella and recovery of BTM by the FPSO, InterMoor carried out work such as final adjustments for the chain and tension through the ILMC system.
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The company was also responsible for subsequent cut and removal of excess chain, and riser pull-in rope stretching and transfer to the FPSO.
InterMoor performed the first phase of operations with the help of Seacor Keith Cowan anchor-handling vessel (AHV) and later on moved to a larger construction vessel already on charter.
InterMoor global president Tom Fulton said: "InterMoor supported this FPSO’s mooring needs by utilising a cost-effective and Jones Act compliant anchor handling vessel, whereas competitors would typically resort to a large construction vessel.
"We were able to successfully provide full project management and engineering, including: design, procedures, procurement, dock support, offshore equipment and personnel for all phases. Our team also designed installation aids and fabricated them in our Morgan City facility, in Louisiana."
Other companies that joined InterMoor on the project were Acteon sister companies, UTEC.
InterMoor’s work scope also included provision of Tow Masters on-board the FPSO, BTM buoy clump weight rigging removal, and dock and equipment support to Shell contracted heading control tugs.
Image: Turritella is a dis-connectable turret moored FPSO and has nine mooring lines that comprise chain and polyester. Photo: courtesy of InterMoor.