Heerema Fabrication Group (HFG)'s Vlissingen facility has completed the HelWin bèta jacket for client Siemens and the structure has set sail to its offshore location in the German sector of the North Sea.
After the EPC (engineering,procurement, and construction) contract award by Siemens in 2012, and subsequent completion of the design by HFG’s in-house engineering, Heerema Vlissingen started the fabrication in October 2013.
Six months later, the 4500-tonne jacket (pictured), which measures 62 x 42.5 x 42m (outside dimensions after installation 64 x 42.5 x 48.5m), has been successfully delivered to Siemens.
As a result of the fabrication-driven engineering focus of HFG Engineering and optimization of the fabrication sequence, the Vlissingen yard was able to build the jacket in a record time of only six months. To further increase fabrication efficiency the jacket has been built in two parts horizontally and completed in vertical position. On 31 March, the jacket was vertically loaded on the barge, after which the seafastening operations started for safe transportation to its offshore location.
Sister Heerema group firm Heerema Marine Contractors will perform the offshore transportation and installation by its semisubmersible construction vessel) Thialf.
In the meantime HFG’s fabrication facility Heerema Zwijndrecht is working on the final construction phase of the 10,200-tonne HelWin bèta HVDC (High Voltage Direct Current) topside, due for completion in summer.
The jacket is part of the HelWin bèta HVDC platform, which is one of the main components of the TenneT DC offshore grid connection HelWin2. The connection with a capacity of 690 MW will connect a large wind farm cluster in the German sector of the North Sea.
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