The International Association of Classification Societies (IACS) has released a Unified Interpretation on CO2 fire extinguishing systems in alcohol-fuelled ships machinery spaces.
Within the update it states machinery space and fuel preparation space where methyl/ethyl alcohol-fuelled engines or fuel pumps are arranged should be protected by an approved fixed fire extinguishing system in accordance with SOLAS regulations. The system should also be able to extinguish methyl/ethyl alcohol fires.
The interpretation says that where CO2 is used to suppress a fire within a machinery space or fuel preparation space in a methyl/ethyl alcohol-fuelled ship, the CO2 used needs to fill at least 50% of the largest space protected, including the machinery space casing.
It also says that as an alternative a risk assessment could be carried out to confirm the suitability of the fire extinguishing system in machinery spaces, including the fixed gas system and fixed local application system. This risk assessment may be subject to approval by the administration.
The interpretation is set to take effect on ships contracted for construction on or after 1 January 2026.
Download the PDF: IACS Unified Interpretation GF21
