The continuous operating protection system called COPS is a diverless solution to achieve the stabilisation and protection of subsea pipelines and cables : the system is based on the use of a continuous fabric formwork mattress which is spread on the sea bed over the pipeline or cable to be protected by a remotely controlled underwater crawler and simultaneously filled with cement grout.

The method has been successfully used in the GULLFAKS field where about 3.6 km of grout mattresses having a cross section of 2 meters by 0.2 meter have been laid.

The performances of the system are presented as well as a trade off comparison with the other stabilisation and protection methods currently used : burying, rock dumping or placement of covers.

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