Wärtsilä unveils Jones Act SOV design

In: Vessels
15/02/2021
Wärtsilä, in close collaboration with key stakeholders – including charterers, shipyards, third-party suppliers and operators – has designed a US flagged, Jones Act compliant hybrid multi-purpose service operation vessel (SOV). The designers also worked closely with classification societies including DNV and ABS, which both provided valuable input to the vessel design.

Wärtsilä’s OPTI Design methodology, a data-driven approach that focuses on the vessel’s total propulsive efficiency, will be applied to achieve balance between propeller, engine and hull. Rather than adding a propulsion system to a finished vessel design, with this approach the two are designed simultaneously, explained Wärtsilä.


“This means we can determine the effects of interaction between the propulsion unit and the vessel itself and use the information to deliver optimal efficiency, reduced costs and emissions and maximised performance,”
said Blake Jackson, Sales Engineer, New Builds, Wärtsilä Marine Business.

The vessel design features Wärtsilä’s patented Low Loss Concept (LLC), an energy-efficient and redundant power distribution system for electric propulsion applications.

The design integrates a range of Wärtsilä’s green systems and solutions, including shore-charging cold iron systems and a hybrid powertrain employing a containerised battery-on-board energy storage system. The company stated that this allows for peak shaving, helping the engines to run at optimal load, thereby lowering both emissions and maintenance costs. The design also includes space for the integration of potential future powerplant and fuel technologies such as hydrogen fuel cells.

It features two boat landings aimed to enhance the safety and efficiency of operations by providing dedicated safe-passage zones for technicians transferring to and from crew transfer vessels. Wärtsilä SmartDock, an automated system that enables consistent and repeatable docking. Operators can also utilise Wärtsilä’s Smart Voyage Optimisation solutions, which are designed to improve fuel efficiency and safety.

To ensure safe operations in all sea conditions the multi-purpose SOV features Wärtsilä’s own dynamic positioning system that is fully integrated with the vessel’s propulsion system. This supports, for example, the vessel's walk to work system, where technicians access the working location via a centrally located 3D motion-compensated gangway integrated into the structure of the vessel.

The vessel’s double-decked cargo space provides ample room for technicians, lifting equipment, parts storage and palletised and containerised cargo. The latter is stored in the dedicated upper deck, which can be fitted with an optional container-handling system. The 76-metre vessel can accommodate up to 60 crew and wind-farm technicians in 55 single and five state cabins.


“The layout reduces common areas to provide more space in individual cabins, which can be configured for double occupancy if needed. This is another way in which the design allows for greater flexibility should the vessel’s operational profile or application change in the future,”
stated Jackson. “The design also takes into consideration the need for crew members to maintain a safe distance from one another in logistics and workflows during situations such as the current COVID-19 pandemic."


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