Lifetime mooring adjustment (VIDEO)

Vryhof Anchors introduces the Stevadjuster, an innovative, cost-effective and time-saving solution for chain adjustment, pre-tensioning of moorings and easy connection or disconnection of anchor lines.

The entire operation takes place subsea and does not require the use of winches or other heavy equipment on the platform being moored. Therefore, the bollard pull of the vessels involved in the operation does not need to be prohibitively high.

Modest installation or maintenance vessels have sufficient capacity to get the job done. The use of this subsea chain adjuster offers significant safety benefits, as the tensioning operation is performed away from the floater.

The Stevadjuster makes it possible to use winchless platforms, which significantly reduces the CAPEX of the floater. The platform side is simplified to a plain connection point such as a padeye, and no power is needed.

The unit is designed for the lifetime of the project, requires no specific maintenance, and can be used for a wide range of different mooring systems. It is particularly efficient when used in a 3-leg mooring system where adjusting a single leg allows tensioning of all three at the same time. Additionally, the chain does not have to be cut, which makes it possible to lengthen the lines at a later date.

The system uses the winch capacity from the installation or maintenance vessel. The platform stays lean, and the tensioning process is performed away from the floater, minimising the risks associated with this marine operation.

The anchors are pre-laid and the non-adjustable lines connected to the floater. With the adjustable line connected last under minimal tension, the chain can then be pulled through and locked in the Stevadjuster at the required tension, and all at a safe distance from the floating asset.

Original Source: https://ocean-energyresources.com/2020/12/08/lifetime-mooring-adjustment-video/