Hohe See Substation Award

10th November 2016

Project Progress

Continuing our close collaboration, Belgian company Iemants Staalconstructies commissioned SLPEL to carry out Detailed Design of the Jacket Foundation for the Offshore Substation at the proposed Hohe See Wind Farm in the German North Sea.

The relatively large 4250 tonne Topsides will be supported by the Jacket, alongside 18 J-tubes and two Boat Landings, in a water depth of 40 metres. The wind farm itself will have a maximum operating capacity of 497MW.

Once again, as a German project, stringent BSH regulations apply. An unusual feature of this Standard is to mandate carrying out much of the Structural Design to Eurocode 3 – the standard structural building code for Onshore structures. Careful application of this code was required to avoid unintended consequences, with SLPEL carefully coordinating with the verification body for the project, DNV-GL, to ensure compliance.

From a geotechnical perspective, the BSH Standard includes a range of onerous requirements in relation to pile testing.  SLPEL proposed a novel approach to pile design which minimised the offshore pile testing, and thus vessel waiting time, whilst adhering to the code and ensuring that the pile would remain driveable.