With the updated figures for methane emissions (CH4 slip), conversion from diesel to LNG reduces net greenhouse gas emissions.
New measurements and surveys conducted in this study document significantly lower emissions than previous surveys. However, in the case of low load on gas engines, there is still a potential for improvement.
CH4 slip increases when the engine is optimized for the lowest possible NOx emissions. Therefore, striving to balance the emission parameters is important.
Engine type is important for the emission profile, eg. high-pressure dual-fuel engines do not have methane emissions at all. The study therefore focuses on emissions from low-pressure engines.