Methanol is a liquid alcohol fuel that can be used in ship engines as an alternative to conventional marine fuels. As it remains liquid at normal temperatures and pressures, it is easier to store, handle, and bunker than many other alternative fuels.
Methanol can be produced via several pathways, with the final products commonly described as black, grey, blue, or green methanol. Regardless of the production route, methanol is a clear liquid, an organic, water-soluble chemical that is readily biodegradable.
Black (or brown) methanol is produced from coal, with production largely concentrated in China.
Grey methanol is produced predominantly from natural gas, by reforming the gas with steam and then converting and distilling the resulting synthesis gas to yield pure methanol.
Blue methanol is produced from waste streams or the by-products of other manufacturing processes, and the methanol so produced is considered renewable.
Green methanol can be produced by several routes, all of which are CO₂-neutral:
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- from biomass or the biodegradable fraction of production waste, such as wood; or
- from renewable energy sources such as solar or wind power, whereby electricity is stored in the chemical bonds of methanol and later reconverted into energy. This route is known as green methanol synthesis.
Methanol almost entirely eliminates sulphur oxides (SOx) and particulate matter (PM), and significantly reduces nitrogen oxides (NOx).
Main risks
Fire hazards: Methanol ignites readily due to its low flash point, producing flammable vapours even at normal temperatures. These vapours can accumulate in enclosed or poorly ventilated spaces and tend to remain close to the ground rather than dispersing creating a risk of fire or explosion where an ignition source is present. The flame burns at a relatively low temperature and is almost invisible in daylight, making methanol fires harder to detect and increasing the risk of a delayed response.
Toxicity: Methanol is toxic to humans via inhalation, ingestion, or skin absorption, and can cause severe health effects, including blindness and death, because the body converts it into formic acid. It is fully miscible in water, meaning that spills can dilute and spread rapidly in aquatic environments; while methanol remains biodegradable, it can still be harmful at high concentrations and may contribute to short-term water pollution.
Skuld's experience
From a P&I risk perspective, owners should maintain a robust design risk-management process underpinned by structured risk assessment, including hazard identification covering fire, explosion, and toxic-release scenarios. Fuel-handling and onboard architectural systems should be established from the outset, addressing ventilation, segregation, hazardous-area classification, detection and alarms, emergency shutdown (ESD) and isolation, firefighting strategy, and material selection. Each of these should be incorporated into the ship's design and build process, in close collaboration with the vessel's classification society and/or flag administration.
A further critical consideration is human factors onboard, encompassing crew competence and safety awareness. Owners should give particular attention to crew interface and ergonomics (clear alarms, intuitive control layouts, and simplified emergency procedures), situational and safety awareness (visibility of leaks and effective gas-detection feedback), and crew training and competence (fuel-specific handling knowledge). Together, these measures enhance crew confidence and operational safety, supported by the vessel's technical managers ashore.