Jumbo installs North Sea FPSO mooring spread

abarrelfullabarrelfull wrote on 17 Apr 2014 11:50
Tags: enquest europe fpso jumbo north-sea services uk

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This year saw Jumbo complete stage one in the first offshore installation contract undertaken as main contractor. Using the J-class vessel, Fairplayer, Jumbo successfully installed an FPSO mooring spread for client EnQuest in the North Sea Alma and Galia field. The second stage of the project will take place in 2014. This will see the EnQuest Producer, currently in Newcastle upon Tyne, UK, hooked up to the mooring spread.

Jumbo were awarded the contract in September 2012, due to an ability to transport large amounts of cargo aboard versatile vessels and the flexibility to adapt to project specific requirements. What this meant to the client was that the work could be undertaken with the utmost efficiency using only one vessel for transportation and installation, thus minimising risk of disruption to the offshore schedule and interface.

The scope of work for the first campaign consisted of construction and installation of anchor piles weighing between 72 and 85t, installation of 130m bottom chain, pre-loading of the anchor piles and bottom chain and installation of 1,150m spiral strand wire.

The first shipment of anchor piles and bottom chain were transported from the Port of Rotterdam. Once on site the anchor piles were driven to the required depths with a hydraulic hammer. A sub frame was placed on the sea bed to get the piles upright and into position. ROVs were utilised to verify the piles’ position. Once the piles had been driven to the required depths, the bottom chain was deployed via a chain wheel operated from the Fairplayer.

The next phase was the pre-tensioning of the piles and chain to remove potential slack in the mooring spread. To achieve this, the chain was rigged through the tensioner and pulled by the crane. A pull of around 300t from the chain led to the required pre-tensioning of 500t.

The final mobilisation saw the transport of the spiral strand wire and top chain from Rotterdam. Onsite the bottom chain was raised on-board the vessel and connected to the spiral strand wire, which was then lowered and installed via the deployment winch.

The wire was then connected to the top chain, which was deployed with the chain wheel. Detailed engineering and utmost care offshore avoided any damage to the delicate spiral strand wire.

A strong focus on safety and quality ensured a first rate performance. Jumbo’s versatile fleet, advanced technological equipment, in-house project management and engineering expertise guaranteed that the project was carried out in a time and cost effective manner, taking just 12 months from award to completion.

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