The International Maritime Organization's Sub-Committee on Carriage of Cargoes and Containers (CCC) has finalised a revision of interim guidelines governing the use of methanol and ethanol as marine fuels, according to a summary published by class society DNV.

The 12th session of the sub-committee (CCC 12) met from 14 to 18 September and completed work on the Interim Guidelines for the Safety of Ships Using Methyl/Ethyl Alcohol as Fuel, first issued as MSC.1/Circ.1621. The amendments revise all sections of the existing guidelines to reflect experience gained since their introduction.

According to DNV, the revised guidelines provide more flexibility in fuel tank placement and leakage-handling arrangements, and introduce a new concept for ventilating fuel spaces. The guidelines also expand guidance on the design of bunkering stations and fire-extinguishing systems, and add new guidance on bunkering operations and personal protective equipment.

Work continues on low-flashpoint fuels and fuel cells

The sub-committee also continued discussions on interim guidelines for ships using low-flashpoint oil fuels, defined as fuels with flashpoints between 52°C and 60°C. DNV explained that members agreed not to develop detailed provisions for a temperature-controlled engine room concept, instead focusing on a safety approach more closely aligned with the existing IGF Code, but with major simplifications to the safety barriers. This work will continue via a correspondence group, with finalisation targeted for CCC 13 in 2027.

Separately, revision of the Interim Guidelines for the Safety of Ships Using Fuel Cell Power Installations, along with other proposed amendments to the IGF Code, was not discussed in detail at this session. That work will also proceed through a correspondence group ahead of CCC 13.

Carbon capture guidelines take shape

CCC 12 began work on developing safety guidelines for ships fitted with onboard carbon capture and storage (OCCS) systems. The guidelines are intended to include a technology-neutral main body covering common ship-level requirements, with technology-specific safety requirements placed in individual annexes.

This work will continue through a correspondence group reporting to CCC 13 in 2027, with the guidelines expected to be finalised in 2028.

Recommendations

As CCC operates as a sub-committee, DNV noted that all decisions on rules, regulations and implementation dates remain subject to further consideration and approval by the MSC.