Upgraded software delivers fuel savings

16 Aug 2017
The DEGO IV advanced speed governor and actuation system onboard 'Stena Scotia' controls the vessel’s propulsion system

The DEGO IV advanced speed governor and actuation system onboard 'Stena Scotia' controls the vessel’s propulsion system

Upgraded software from ABB is delivering measurable efficiency gains to Stena Line’s 'Stena Scotia' freight ferry.

The DEGO IV advanced speed governor and actuation system onboard has been enhanced by the newly installed software, so that control over the vessel’s propulsion system minimises roll and rudder movements, delivering a new way of saving fuel while also improving crew comfort.

“For us it is important to minimise the daily fuel consumption and related emissions. ABB guaranteed us a minimal saving potential of 3% when utilising the latest generation of the DEGO system,” said Dick van der Ent, energy efficiency manager at Stena Line BV.

Data collection

ABB’s fourth generation DEGO software collates data from sensors monitoring 60 shipboard parameters in real time, including engine performance, propeller performance, rudder/vessel centre of gravity torque and navigational information.

In an advance on previous versions, DEGO IV uses this data to model a control strategy to minimise ship roll, adjusting to changing sea or ship conditions by simulating the next two roll periods to optimise roll damping against fuel consumption on a predictive basis.

Efficiency gains

ABB said the efficiency gains available using the DEGO system depend on ship type, sea conditions and the type of autopilot used. First installations of DEGO IV, made across ten vessels, indicate fuel saving potential in the range of 5 to 7%, with roll reduction between 20 to 40% and rudder reduction of 15 to 60%.

The 120-trailer capacity, twin-propeller Stena Scotia is deployed in daily Ro-Ro services between Rotterdam and Killingholme in the UK.

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