Ampelmann and C-Job Naval Architects have revealed a new offshore wind feeder vessel concept with motion compensation technology, specifically suited for the rigorous demands of operating off the east coast of the United States of America. The feeder concept – which is envisioned to be a series.
The Dutch offshore access provider and ship design company have developed a feeder vessel solution that supports the construction and logistics of US wind farms.
Todd Allen, VP Business Development at C-Job Naval Architects, says: “The United States is ambitious in its plans to grow the installed offshore wind power. The only viable way to realize this goal while complying with the Jones Act is utilizing offshore wind feeder vessels.”
All turbine components in one go
The Jones Act does not allow for foreign installation vessels to call US ports. With this feeder concept – which is envisioned to be a series – all the turbine components including the blades, are brought to the installation site in one go by the feeder vessel. This is made possible due to the A L-shaped superstructure. This vessel is relatively compact, minimizing construction and operational costs.
Ampelmann motion compensation system
To maximize workability and allow for safe lifting of the components, the feeder vessel features a specially designed motion compensation system by Ampelmann. The system uses Ampelmann’s core technology to stabilize the components of the wind turbine generator in six degrees of freedom. It is designed for safe lifting operations in sea states up to 2.5m significant wave height. The compensator is positioned close to the vessel’s center where it can compensate all vessel motions and allows for continued operations – even in adverse weather conditions – throughout the year.
The wind turbine components are arranged on the ship with a quick connect grip- and glide system. Cargo pallets are placed on deck quickly thanks to the quick connect system. Once the feeder vessel is at its destination, the system slides the components into place to connect to the motion compensator. The Ampelmann system then compensates all vessel motions, so the crane operator can lift turbine components in a similar fashion to an onshore lift.
With two or more feeder vessels per project, this allows the wind turbine installation vessel (WTIV) to focus on the installation of the turbines and ensures operations can continue at all times. Source: Ampelmann