JB-117 installed at DolWin 3 Gamma Windfarm

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Offshore Marine Contractors were appointed by Jack-Up Barge to provide assistance with the mobilization of JB-117 to the Dolwin 3 project.

The Dolwin3 project establishes a 900 megawatt direct current grid connection for wind farms in the south-western part of the German North Sea, about 30 nautical miles North of Schiermonnikoog. DolWin3 is the third grid connection project in the DolWin cluster. A high-voltage direct current transmission system line connects the offshore converter platform DolWin Gamma to the corresponding onshore converter station in Dörpen/West.

The self-elevating platform JB-117 will provide crane support and accommodation services during the float over, installation, hook up and commission of the top side. The tow commenced in Flushing and set sail to the project location, this was conducted by the 85 tons bollard pull Thor and the 70 tons bollard pull Atlantis. On the DolWin 3 location tug Thor provided anchor handling services for the tight tolerance rig move within a complex anchor pattern.

Positioning of the JB-117 within such tight tolerance’s to both subsea obstructions and the DolWin Alpha substation was successfully performed in close co-operation with Jack-Up Barge and Marine Offshore Designers who provided survey/positioning services.