Due to the benefits to human health from improved air quality, and in the context of international and European regulations for emissions reduction, the maritime shipping sector has been shifting from diesel to Liquified Natural Gas (LNG). Among the available LNG technologies, the sector has shown a preference for the low-pressure dual fuel concept. This technology has many advantages, however, the phenomenon of methane slip (the escape of unburned methane into the atmosphere) combined with the high warming potential of methane gas (28 times that of CO2), is reducing the overall climate benefits of the shift to LNG.

In this context, the GREEN RAY project is assessing and mitigating methane slip in LNG engines to enable clean waterborne transport.