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Wärtsilä’s propulsion solution for gas-fuelled tugs

LNG Industry,

Three large new escort tugs contracted by Østensjø Rederi will feature Wärtsilä dual-fuel (DF) engines, integrated with the company’s gas storage and supply system.

The tugs will operate primarily on LNG, however the Wärtsilä DF engines provide the flexibility to select the most suitable fuel according to availability, price and environmental restrictions. The contract for the Wärtsilä solution was signed in December 2014. The tugs have been designed by Robert Allan Ltd, in close cooperation with Østensjø Rederi.

LNG system

The compact LNG system incorporates Wärtsilä's LNGPac fuel system, a fully integrated gas handling system, and the Wärtsilä Gas Valve Unit (GVU). The tugs will be powered by 6-cylinder Wärtsilä 34DF dual-fuel engines. The Wärtsilä equipment will be delivered during the first half of 2016.

"These are trend setting tugs in that they provide environmental sustainability through the use of LNG fuel. Wärtsilä is the technology leader in making this trend possible. At the same time, the flexibility of the dual-fuel engine technology also ensures a high level of operational security since the switch from gas to diesel can be made at any time without loss of speed or power," explained Carl Johan Amundsen, Project Manager at Østensjø Rederi.

The vessels have a bollard pull of 100 t, and will operate at Statoil's Melkøya terminal near Hammerfest, Norway.

Adapted from press release by Katie Woodward

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