Offshore Marine Management ('OMM') has successfully completed a
contract for Prysmian Powerlink as preparations continue for the
installation of BorWin2, which will connect new wind parks off the
coast of Germany.
Using the 2,000 tonne multipurpose vessel Bourbon Enterprise,
OMM cleared the route proposed for the 124km (77 miles)
high-voltage direct current export cable that will connect the new
wind parks to the onshore grid. This involved identifying out of
service cables along the route, and then using a grapnel and chains
set up to bring these cables onto the vessel, for later safe
disposal on shore.
OMM then conducted mattressing of the existing in-service
underwater assets, including telecommunication and electricity
cables as well as gas pipelines. Using a remotely operated
underwater vehicle launched from the vessel, OMM's team conducted a
detailed survey of the sea bed, before identifying the correct
position for each mattress and then releasing each into its
location. A post-installation survey confirmed that no interference
with third party assets had taken place.
Finally, OMM used the Bourbon Enterprise to conduct a Pre Lay
Grapnel Run (PLGR) to clear the seabed of debris and other unwanted
materials such as fishing lines - to ensure the route for the new
Prysmian cable was clear and in good condition for cable
Commenting on the project, OMM's Project Manager Michael
Finnerty, said: "The wind parks that will be connected via BorWin2
will be some of the largest yet built off the German coast,
generating in the region of 800 megawatts of clean electricity. Our
client demanded comprehensive route clearance and PLGR support from
us - as well as mattressing along both the HVDC and separate AC
routes that will run between two new offshore substations.
"OMM has a strong working knowledge of Prysmian's projects in
the North Sea and our ability to conduct such crucial
pre-installation work efficiently and thoroughly demonstrates we
are an ideal business partner for this type of project."
OMM's work on BorWin2 follows similar work the company
successfully completed on Germany's first HVDC link, BorWin1.
In November 2011, OMM announced it had completed its first cable
storage task for Prysmian and Siemens Energy.