At Noordwijk, the Netherlands, a number of electricity cables coming from wind farms located in the North Sea reach the land. Recently, one of these cables was found to be too close to the surface with only 1.5 m of sand on top.
The decision was made to bury them deeper below the surface.
To do this job, Jan De Nul designed and built a special vehicle – the trencher, ready to work in the surf zone independently, and bury the cables using pressurized water.
This is where two Damen DOP250 submersible dredge pumps come into the picture.
On the trencher, which has been called “Sunfish”, the 2 wear resistant DOP dredge pumps are mounted. These dredge pumps supply some 1.250 m3/h of sea water each to both robotic arms.
Fluidizing the sand , the cables are buried deeper using gravity.