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OVERDICK: SylWin alpha successfully installed
OVERDICK on behalf of Siemens, the general contractor for the project,
conducted the concept design and the structural detail engineering, as
well as the transport and installation engineering. The Siemens electrical
plant fitted inside the platform is capable to transmitting 864 MW into
the onshore power grid making it the most powerful converter substation
installed in German waters to date.
The topsides’ record setting
weight is beyond the lifting capacity of any offshore crane available.
Therefore the design decision was made to conceive the platform as a
float-over installation combined with self-elevating capability. The
installation was conducted in three phases: following the initial
installation of the jacket, the topsides was towed to the site and set
down on the jacket by float-over. Finally a temporary hydraulic jacking
system was used to elevate the topsides to the required height. In this
way a conventional float-over, typically used in more benign waters of
i.e. SE Asia, has been demonstrated feasible also in the North-Sea where
this concept has never been followed up to now.
The installation of
the 5600 tonne jacket was performed in April this year by means of heavy
lift from a submersible barge. Due to the large lifting weight, the jacket
was partially submerged to activate sufficient buoyancy to reduce the
lifting load for the crane. Two temporary buoyancy tanks were fitted on
the jacket to further increase buoyancy. After set down of the jacket on
the sea bed, the tanks were recovered to the surface.
While the
jacket’s 9 piles were being installed offshore, the preparations of the
topsides were finalised at Nordic Yards in Warnemuende. The topsides,
which had been assembled on its transport barge was floated out of the dry
dock and towed from the Baltic Sea to the installation site in the North
Sea. The barge was positioned over the jacket prior to initiating contact
between the topsides’ legs and leg mating units by means of ballasting and
hydraulic jacks.
Following the installations of the HelWin alpha
and BorWin beta platforms, SylWin alpha is the third HVDC platform
designed by OVERDICK installed in the North Sea. Together with the design
of the Global Tech I and Borkum West II transformer platforms this success
strengthens OVERDICK’s position as the leading engineering contributor to
Germany’s offshore wind substation development.
The design of the
DolWin gamma platform ( already under way at OVERDICK ) will be
added to this track record.
Source: Andreas Rosponi, Reiner Klatte, Klaas Oltmann
OVERDICK
OFFSHORE ENGINEERING - www.overdick.com
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