Cobra Cable, Offshore Services

Offshore Services in Eermshaven Netherlands

In 2018, Rohde Nielsen was awarded a contract by the client “Prysmian”.

The installation of the 2 x 700 MW interconnector COBRA cable requried trench dredging and backfilling works, for which Rohde Nielsen executed. More than 4,000,000 m3 of sand was moved with our equipments over a total length of 6 km.

This Waddenzee zone was notoriously difficult to work in due to heavy resiltation, moving sandbanks and breaking waves from the exposed Northsea.

Njord R, Magni R, Sif R, Gungner R, Ajax R, Sleipner R, Roar R, Helge R, Tjalfe R and Skinfaxe R were all allocated to the project.

  • Location: Eemshaven, Netherland
  • Scope: 4,656,000 m3 or 2,600,000 m3 in 5 sections
  • Client: Prysmian Power Link, TenneT and Energinet
  • Year: 2018-2019

The fleet that made it possible

  • Njord R
  • Magni R
  • Sif R
  • Tjalfe R
  • Gungner R
  • Ajax R
  • Roar R/ Helge R
  • Skinfaxe R
  • Sleipner R
Hopper capacity
6,000m3
Length overall
111.30m
Breadth
19.40m
Draught loaded
7.00m
Draught unloaded
3.80m
Dredging depth
35.00/75.00m
Hopper capacity
1,570m3
Length overall
75.49m
Breadth
12.80m
Draught loaded
3.80m
Draught unloaded
2.00m
Dredging depth
28.00/40.00m
Hopper capacity
2,173m3
Length overall
80.00m
Breadth
13.80m
Draught loaded
4.87m
Draught unloaded
2.90m
Dredging depth
24.00/46.50m
Hopper capacity
789m3
Length overall
57.50m
Breadth
14.80m
Draught loaded
3.45m
Draught unloaded
1.80m
Dredging depth
up to 100.00m
Bucket size
5.4-11m3
Length overall
54.88m
Breadth
15.25m
Draught
1.82m
Depth
3.35m
Dredging/Installation depth
20.00m
Bucket size
700 litres
Length overall
51.26m
Breadth
11.75m
Draught
3.12m
Dredging depth
19.00/36.00m

Roar R/ Helge R

Download specifications
Hopper capacity
950m3
Length overall
60.30m
Breadth
11.00m
Draught loaded
3.56m
Draught unloaded
1.35m
Type
Split barge
Length overall
27.02m
Breadth
9.74m
Draught
2.63m
Main engine
2×1,230kW
Speed
12.2kn
Length overall
15.00m
Breadth
6.00m
Draught
1.70m
Main engine
2x224kW
Speed
7.1kn

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well as a subcontractor.

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