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An LNG-fuelled ferry would not only have significant environmental benefits, but economic ones as well, according to a recently completed feasibility study for Washington State Ferries.
Naval architectural and marine engineering firm The Glosten Associates, Seattle, Wash. recently completed the feasibility study for Washington State Ferries (WSF) on converting its 144-car ferry design to liquefied natural gas (LNG) propulsion. Glosten's study concluded that the conversion is both technically feasible and cost effective, although technical and regulatory challenges remain. The study examined design, economic, regulatory, and environmental issues.
To support the study, Glosten developed a preliminary design for both dual fuel and singlefuel (LNG only) engines. The operational savings for a single vessel are estimated to be between $900,000 and $1.25 million per year, after an upfront capital cost premium of $8.5 million to $10 million. Switching to natural gas fuel will significantly reduce emissions of nitrous oxides (NOx), sulfur oxides (SOx), particulate matter, and carbon dioxide (CO2). These greenhouse gases have been identified by the U.S. Environmental Protection Agency (EPA) as significant factors in harming human health, including respiratory illnesses, as well as damaging to the environment.
One significant finding in the report was that methane slip from the engines counteracts its reduction in CO2 emissions, minimizing the global warming benefits of switching to the lower carbon fuel.
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http://www.marinelog.com/index.php?option=com_content&view=article&id=1253:lngferrystudy23august2011j01&catid=1:latest-news&Itemid=107
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