New dredging projects awarded to Jan De Nul Group in Canada and New Zealand
Glory Hole Excavation in Canada
Jan De Nul has recently been awarded a contract in Canada by Husky Energy to excavate a so called “Glory Hole” for protection of subsea wellheads at a challenging waterdepth of 135 m. This will be a new world record in dredging depth. The work will be executed during this summer with Jan De Nul’s very large trailing hopper dredge “Vasco da Gama”, which is the same vessel that executed similar works for the same client 4 years ago.
The “Vasco da Gama” is equipped with a very large suction pipe and 6,500 kW underwaterpump, and is the only trailing hopper dredger which can excavate at such extreme depth and challenging soil conditions containing stiff clay with boulders up to 5 ton in size. The “Glory Hole” serves to allow to install subsea wellheads below the surrounding seabed in order to protect against the impact of icebergs passing over.
Kupe Pipeline Project in New Zealand
In New Zealand, the side dumping vessel “Pompei” is executing prelay rockdumping for the Kupe Pipeline Project under a subcontract between Jan De Nul and Technip.
The prelay rockberms are installed at a spacing of 12 m at predefined heights over a 1,600 m corridor length in order to allow installing the pipeline safely over the rough seabed with boulders up to 2 m in size.