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Marine Propulsion & Auxiliary Machinery

Marine Propulsion & Auxiliary Machinery

First deliveries for new thruster technology

Tue 29 Aug 2017 by Martyn Wingrove

First deliveries for new thruster technology
Model test of Schottel’s VarioDuct SDV45 nozzle

Schottel delivered the first of a new type of thruster to three dual-fuel tug newbuildings. Six thrusters with the new VarioDuct SDV45 nozzle were supplied to a Spanish shipyard that built three tugs for Norwegian owner Østensjø Rederi.

Shipbuilder Astilleros Gondán installed Schottel rudderpropeller type SRP 630 CP on Robert Allan-designed tugs Audax, Dux and Pax. These 40 m tugs were built and equipped to provide escort and manoeuvring services at Statoil’s LNG production terminal at Melkøya, Hammerfest in northern Norway.

The main thrusters are powered by two Wärtsilä 6L34DF main engines with a power rating of 3,000 kW each. Additionally, these tugs are fitted with a Schottel transverse thruster type STT 170 FP with 250 kW in the bow.

Schottel said the thruster arrangement enables these tugs to achieve a maximum speed of 15 knots and up to 107 tonnes of bollard pull. These tugs are able to obtain an indirect steering force of 167 tonnes at 10 knots and a breaking force exceeding 200 tonnes. These tugs are classed according to the rules of Bureau Veritas.

The next delivery for the new nozzle design will be for a windfarm service vessel that is under construction at Cemre Shipyard in Turkey. A vessel being built for Louis Dreyfus Armateurs Group will have three Schottel Rudderpropellers featuring the new nozzle.

Astilleros Gondán delivered the third LNG-fuelled escort tug, Audax, earlier in August to Østensjø. The series are RAstar 4000-DF class tugs that comply with IMO Tier III emissions standards

Among their duties, they will conduct approximately 300 LNG ship escorts annually, will assist with berthing operations and will be maintained in readiness for emergency services such as long line towing, fire-fighting, and oil spill response.

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