Retrieving a cable from the seabed can be challenging when it is 300 metres long and needs to be lifted up to the ship. The danger is that it slips when it's almost up. Here it is important to have a good and secure grip on the cable, as the weight from the cable increases the closer to the surface the cable gets. There are several uncertainties associated with the operation, both regarding whether the cable will follow all the way to the surface, and the time spent.
The customer's need was to repair a cable that lay on the seabed. The solution was to use a "Cable Gripper", operated by ROV. The length of the cable exceeded the water depth of 300 metres, and retrieving it would result in strong forces at the lifting point. Thanks to a skilled supplier industry, such challenges are manageable, even under harsh conditions on the Norwegian continental shelf.
Takket være en dyktig leverandørindustri er slike utfordringer håndterbare, selv under tøffe forhold som er på norsk sokkel.
Although systems have been developed to handle cables in deep waters, new creative solutions must be found when unforeseen problems arise.
In our case, we solved this by using our experience in friction technology. The equipment was designed and verified according to DNV's maritime standards. This entails, among other things, a full-scale test of the equipment before certification, with far higher loads than expected during the operation of tools. An important part of this certification and testing is to ensure that the tool has sufficient grip and does not slip. This helps to create predictable and secure operations.
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