Fire Safety Challenges With Methanol-Fueled Ships Revealed In New Study

• A new fire safety study by global Survival Technology solutions provider Survitec has revealed that existing firefighting methods used to extinguish machinery space spray and pool fires on conventionally fuelled vessels are inadequate when dealing with methanol-based fires.
• This follows extensive comparative fire tests on dual-fuel marine engines using diesel oil (DO) and methanol, carried out amid growing interest in methanol as an alternative marine fuel.

A new fire safety study by Survitec finds that existing fire-fighting methods used to extinguish machinery space spray and pool fires on conventionally fuelled vessels are not fit for purpose when dealing with methanol-based fires.

Challenges in tackling onboard methanol-based fires

The study’s conclusions follow comparative fire tests on dual-fuel marine engines using diesel oil and methanol.

‘Our tests confirm that traditional water mist fire suppression mechanisms do not perform as expected on methanol pool fires and methanol spray fires. A completely different approach is required if these ships are to remain safe,’ said Michal Sadzynski, Product Manager, Water Mist Systems, Survitec.

Methanol is a methyl alcohol (CH3OH) that burns in a completely different way than hydrocarbon fuels and has a much lower flashpoint of 12°C (54°F). Survitec points out that while there are established fire safety regulations and testing standards for diesel fuels, clear test protocols for alcohol-based fuels such as methanol and ethanol have yet to be developed.

‘We believe this is a high-risk situation that needs immediate action,’ said Sadzynski. ‘Methanol fires are far more aggressive than fires involving traditional hydrocarbon fuels. Methanol fires have different physicochemical properties and so they cannot be extinguished as easily or with the same approach.’

The Survitec tests found that while water mist systems are highly effective in absorbing heat and displacing oxygen on diesel fires, they do not produce the same results on methanol fires. This finding indicates that if existing vessels are retrofitted to run on methanol, they would need to overhaul and redesign their fixed fire-fighting arrangement.

For bilge areas, statutory rules formulated in IMO MSC.1/Circ.1621 establish a requirement for an approved alcohol-resistant foam system for ships running on methanol. For the first time, a fixed, low expansion foam system is mandatory under the rules when it comes to protecting machinery space bilges.

‘Our tests demonstrate that standard discharge devices do not properly extinguish methanol pool fires in the confined bilge space. It is crucial to deliver properly expanded foam on the methanol pool fire and this is not an easy task within such a narrow space where throw length is limited,’ said Maciej Niescioruk, Product Manager, Foam Systems, Survitec.

He continued: ‘MSC.1/Circ.1621 provides us with a starting guideline but it is very general and therefore open to interpretation. Moreover, methanol compliance for Local Application Firefighting (LAFF) systems is not yet covered. As an industry, we need to come together and develop comprehensive and robust fire test standards and safety rules tailored to methanol’s unique properties.’

Did you subscribe to our daily newsletter?

It’s Free! Click here to Subscribe!

Source: Survitec

• 
• 
• 
• 
• 
• 
• 
•