Windea Leibnitz: Upgrade at Ulstein transforms SOV to CSOV

Bernhard Schulte Shipmanagement and the Ulstein Verft shipyard in Norway have just completed a conversion that could answer some questions for those of us who are still hazy about what differentiates an offshore wind CSOV (commissioning service operation vessel) from an SOV (service operation vessel).

Last November, the 2017-built SX 175 design SOV Windea Leibniz arrived back at its building yard, Ulstein Verft for an upgrade to a CSOV that included an increase of cabins from 60 to over 80 installed one extra walk-to-work gangway pedestal on the stern for Baltic Sea operations to complement the existing North Sea pedestal.

When delivered, the vessel was the 100th to feature Ulstein’s signature X-bow solution and features the X-stern, with both solutions delivering increased comfort and reduced noise and vibrations.

The yard completed the upgrade on February 4.

The 50% increase in accommodation capacities on board required extensive reconstruction of the changing/drying rooms, conference rooms and day rooms.

In total, the cabin capacity was increased from 63 to 81 cabins.

Windea Leibniz can now accommodate up to 85 technical staff for wind farms, service personnel and crew.

Another major milestone was the installation of a new height-adjustable pedestal for the motion-compensated gangway. The gangway can operate in a range between 17.5 meters and 23 meters height above the waterline when fully extended.

Bernhard Schulte Offshore decided to install a second pedestal for the gangway at the stern since hardly any other operating offshore wind service vessels could take on assignments in both the North Sea and the Baltic Sea, where service platforms are generally located lower than in the North Sea. The existing gangway can be used on both pedestals.

“With the two new pedestals, we are more flexible when approaching the service platforms for the wind turbines. There is no uniform standard for the height of the platforms in North Sea wind farms,” says the vessel’s captain, Rainer Mueller.

Ulstein’s designers and engineers undertook the structural engineering work required for the upgrade. This included reinforcement of the bridge to carry the gangway which is now parked on the bridge roof. The area for the base of the pedestal also needed to be strengthened.

“The new upgrades make a very capable vessel even more versatile. Now our Windea Leibniz is more flexible and attractive for the market. The upgrade was perfectly planned and executed by Ulstein. My thanks go to everyone involved in this great project,” says Matthias Mueller, managing director of Bernhard Schulte Offshore.

Windea Leibniz Dimensions

Length: 88 meters

Beam: 18 meters

Deadweight: 3,150 tonnes

Draft (max): 6.4 meters

Speed (max): 13.5 knots

Accommodations: 85 POB

Deck area: 380 square meters