Certification of fixed fire suppression systems is one of the most complex aspects of merchant vessel maintenance. SOLAS Chapter II-2 sets minimum requirements, but Classification Societies often apply additional criteria. This guide summarises the process for the three most common systems.
CO₂ system for engine room
The total flooding CO₂ system is the most widespread on vessels over 500 GT. Certification requires:
- Weight verification of each cylinder (maximum tolerance: -5% of nominal weight)
- Inspection of distribution pipes and nozzles
- Functional test of pre-discharge acoustic and visual alarm system
- Verification of automatic ventilation and fire door closures
- Documentation of flooding calculation by manufacturer
High-expansion foam
HEX foam systems are common in engine rooms of RoRo vessels and ferries. Critical inspection points include the concentrate concentration (verified with refractometer), foam generator condition, and concentrate tank capacity relative to the protected space volume.
Condensed aerosols — the sustainable alternative
Condensed aerosol systems have gained acceptance over the last 10 years as an alternative to halons and HFC-227ea. Their main operational advantage is the absence of post-discharge clean-up agent: they do not damage sensitive electronics or vessel classification records. Extinval is a certified supplier of condensed aerosol technology for the recreational marine and offshore industries.
Certification roadmap
The typical process has four phases: (1) initial condition audit, (2) action plan with timelines and costs, (3) execution of works with signature of certified technician, and (4) inspection by the Classification Society surveyor. Extinval accompanies the shipowner through all four phases, acting as technical liaison with the inspector.