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Wärtsilä chosen for LNG ship conversion

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LNG Industry,

Wärtsilä has been chosen to supply the main engines, generators and integrated LNG storage and fuel gas handling systems (LNGPacTM) for the largest LNG conversions ever undertaken in North America. 

The contract, awarded by Totem Ocean Trailer Express (Totem Ocean), was signed in Q4 2013.

Totem Ocean's fleet of two Orca Class roll-on/roll-off cargo ships - M.V. Midnight Sun and M.V. North Star - transport approximately one-third of all the goods required by the inhabitants of Alaska, including food, household goods, vehicles, construction materials and military supply support.

As a result of the conversion, the Totem Ocean vessels will reduce sulfur oxide (SOx) emissions by 100%; particulate matter by 91%; nitrogen oxide (NOx) by 90%; and carbon dioxide (CO2) by 35%.

"It is an unprecedentedly exciting time to be in the maritime industry. Economic constraints and the need to comply with environmental legislation have combined to accelerate the switch to LNG fuel. Wärtsilä is uniquely positioned to enable this transition since we have been a leader in developing the appropriate technology for nearly 30 years. We look forward to working with TOTE on converting the Midnight Sun and North Star to LNG so that they can realise the benefits that LNG as a marine fuel can provide," says Björn Rosengren, President & CEO of Wärtsilä Corporation.

Project specifications

  • Each of the vessels will be equipped with four 12-cylinder Wärtsilä 50DF dual-fuel engines and generator sets.
  • Wärtsilä 50DF engines have been designed to give high output combined with fuel flexibility, low emissions, efficiency and reliability.
  • Engines can be run either on natural gas, light fuel oil or heavy fuel oil.
  • Wärtsilä also provides the vessels with two 1100 m³ LNG fuel storage tanks and the associated automaton and fuel gas handling systems.
  • In addition to the equipment, Wärtsilä is taking responsibility for the design, engineering and integration of the system, and project and site management for its scope of supply.

Adapted from press release by

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