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W I N D E N E R G Y
Offshore wind turbine installation units
World’s first class notation
In response to the emerging offshore wind
power market, DNV is launching the world’s
first class notation for offshore wind turbine
installation units. The market for wind turbine
installation units is growing rapidly as the
offshore wind industry picks up pace. The
classification of these units is based on DNV’s
Offshore Service Specification DNV OSS-101
‘Rules For Classification Of Offshore Drilling
And Support Units’, which was originally
developed for classifying drilling and production
vessels used in the oil & gas industry.
Wind turbine installation units may be columnstabilised,
self-elevating or ship-shaped
units that are tailor made for the installation
and maintenance of fixed and floating
wind power equipment. They are designed
to install the different equipment, such as
foundations, columns, generator houses
and blades, piece by piece by crane lifts or
in one operation using lowering techniques.
Different
“Compared to traditional oil and gas
units, these vessels have a different set of
safety and technical issues and are not
normally designed for the hazards of the
oil & gas industry, ie, exposure to extreme
weather and hydrocarbons leading to a
risk of fire and explosions. This, in addition
to increased requests from the industry,
has motivated us to launch the new class
notation,” says Henning Carlsen, the
business development manager in DNV’s
Offshore Classification unit.
Increase
“DNV has been involved in the wind
turbine installation unit market since
2003, when it classed the Mayflower
installation vessel. Today, we are in the
forefront with new projects in all the
major home markets for offshore wind
farms, and we expect a significant
increase in the coming years as we see
several new projects are in different stages
of development,” Carlsen explains.
The increased involvement in the classification
of wind turbine installation vessels
also falls naturally into DNV’s already
broad portfolio of services to the wind
energy market, including comprehensive
certification and qualification projects
relating to floating and fixed wind turbines.
The new class notation, which will serve
as a recipe for how to class wind turbine
installation vessels, is currently being
piloted and is expected to be added to
DNV OSS-101 by October of this year.
Additional
The new rules for wind turbine installation
units focus on four main areas:
• general design and construction
requirements for wind turbine, wave
power and tidal power installation units
• design requirements for the different
types of wind turbine installation units,
which include ship-shaped units, selfelevating
units and column-stabilised units
• structural details relating to the lifting
operations and the many cycles of
repeated vessel operations
• certification of materials and
components.
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