World’s first LNG hybrid tug showcases Schottel solutions

Written by Nick Blenkey
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Tug will be operated by Jurong Marine Services

Being built by Sembcorp Marine for operation in Singapore, the world’s first LNG hybrid harbor tug will feature the Schottel Sydrive-E azimuthal hybrid drive system and twin Schottel Rudderpropellers.

Depending on the desired operating mode and the required propulsive power, the Schottel hybrid drive system Sydrive-E activates the appropriate power source or both together.

As we reported earlier, the tug is the first in a series of 12 being built for operation by Sembcorp Marine subsidiary Jurong Marine Services, with support from the Maritime and Port Authority of Singapore (MPA).

Designed by Semborp Marine’s Bergen, Norway, based LMG Marin subsidiary, powder will be provided by two MTU 16V 4000 M55RN gas engines, developing a combined total power of 2,984 kW, supported by 904 kWh of battery power for zero-emission operation, as well as for peak shaving.

The tug’s future operation profile will demand highly variable power ranges. The LNG-fueled MTU main engines and the tug’s electrical motors are both coupled to the Schottel Sydrive system and always operate efficiently within their optimal load ranges, reducing fuel consumption and emissions.

The type SRP 430 RudderPropellers upper gearboxes feature two power input positions.

The tug’s hybridized type SRP 430 Schottel RudderPropellers will each have a power intake capacity of about 2,000 kW, supplied by zero emissions electrical motors and/or the low-emission LNG-fueled main engines. The 360-degree steerable SRPs combine maximum maneuverability and a high bollard pull, as harbor operations require.

In terms of thruster integration, each upper gearbox offers two power input positions with an offset angle of +/- 90° for two power sources. An option with a +/- 135° offset angle is also available allowing even more design flexibility.

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