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Converting Ships To LNG

Wärtsilä supplying eight dual-fuel engines, generator sets, fuel storage tanks, associated systems, project management

Posted on February 18, 2014

Wärtsilä will supply main engines, generators and integrated LNG storage and fuel gas handling systems (LNGPac) to Totem Ocean Trailer Express (Totem Ocean) for the largest LNG conversions ever undertaken in North America, the company said.

Totem Ocean's fleet of two Orca Class roll-on/roll-off (RORO) cargo ships – the M.V. Midnight Sun and the M.V. North Star – transport about one-third of all the goods required by the inhabitants of Alaska, U.S.A. This includes essential items such as food, household goods, vehicles, construction materials and military supply support.

Each of the vessels will be equipped with four 12-cylinder Wärtsilä 50DF dual-fuel engines, which can be run on natural gas, light fuel oil (LFO) or heavy fuel oil HFO), and generator sets. Wärtsilä is also providing the vessels with two 1100 m³ LNG fuel storage tanks and the associated automaton and fuel gas handling systems.

The company said that in addition to the equipment, it is taking responsibility for the design, engineering and integration of the system, and project and site management for its scope of supply.

As a result of the conversion, Wärtsilä said the Totem Ocean vessels will set new standards for environmental responsibility by reducing sulphur oxide (SOx) emissions by 100%; particulate matter (PM) by 91%; nitrogen oxide (NOx) by 90%; and carbon dioxide (CO2) by 35%.