Heavy-load deck carriers for the Offshore Renewables Industry
Togerther with Concordia Group, Holland Shipyards initiated a new project in November 2015. The design, an in-house development by Concordia Group and Holland Shipyards, is intended for the transportation of large windmill parts, allowing loading and offloading by means of rolling the cargo instead of lifting it.
With the design, significant time savings are realized, due to higher transit speeds and much quicker unloading operations with heavy load carts. Effectively, turn-around time in ports has been cut in half by this design.
Some of the details of the design are:
• Cargo deck on main deck level.
• Anti-heeling / ballasting system below deck.
• Cargo protection coaming and covers.
• The bow is lifted by two lifting arms, including a 16 meter driveway platform that extends to the shore
The design of the bow, the ramp, the mobile tent and the ballastsystem where unique to this project and have proven to be extremely successful during operations.
During the construction of the Rotra Vente, which was delivered on October 2016, the construction of sistership Rotra Mare commenced in June 2016. The Rotra Vente and Rotra Mare are both used for the transport of wind turbines, towers and blades.
The Rotra Vente and Rotra Mare share the same dimensions and cater to the same market, however there are several differences. The main difference between the two ships is that the Rotra Mare has not been outfitted with coaming and cargo cover. Instead, four moving gantries were placed to transport windmill blades. Below these gantries, additional towers or nacelles can be transported, which means that the vessel is capable of transporting dual cargo.
The Rotra Vente has been specially designed for the transportation of nacelles, but also towers can be carried. The Rotra Mare is geared towards transport of towers and blades when the gantries are in use. Alternatively, she is also suitable for transporting turbines when no gantries are placed on the vessel.
We thank the Concordia Group for this challenging assignment and the pleasant cooperation throughout the project.