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Wednesday, December 8, 2021 

A new 25m vessel, Crowley's 'eWolf', the first all-electric tug to be built and operated in the US, will be equipped with Schottel systems, including two SRP 430 RudderPropellers featuring the LE-Drive (Embedded L-Drive), and MariHub, the data IoT Gateway and monitoring solution.

To be constructed at Master Boat Builders shipyard in Coden, Alabama, and designed by US-based Crowley Engineering Services, it is scheduled to enter operations by mid-2023. eWolf will support ship arrivals and departures at the Port of San Diego in California.

Joshua Ellis, VP Ship Assist Services, Crowley, said: “The eWolf’s zero-emissions design features a propulsion system that will provide a sustainable ship assist solution with enhanced safety and nimble manoeuvring capabilities. Crowley looks forward to working with experienced, innovative partners like Schottel to deliver this ground-breaking ship-assist tug that will offer customers in San Diego sustainable, high-performance operations.”

The electrically driven 2050kW RudderPropellers with propeller diameters of 2.5m will enable the tug to achieve a bollard pull of around 70 short tonnes. The SRP 430 LE is characterised by compact design and low installation height. Omission of the upper gearbox increases mechanical efficiency by around 3%, while reducing energy consumption.

The eWolf will have a 6 MWh energy storage system with sufficient capacity for the vessel to deliver one full day of normal work without using any fuel. Batteries can supply power to the propulsion system almost instantly, ensuring effective ship support and harbour escort services without emissions. The systems are designed for fast-changing load requirements. The vessel has two generators on board for emergency use and to enable longer transit distances at reduced speed.

MariHub, the IoT gateway and monitoring solution from Schottel, records and analyses data from sensors for machinery and other components which can then be evaluated by certified Schottel experts. Together with the condition monitoring service ProCMS, MariHub allows for early detection of any irregularities in the propulsion system. This predictive maintenance approach will increase availability: ProCMS supports the operator’s efforts in reducing maintenance costs and improving maintenance planning.

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