IMCA highlights an incident involving smoke in a vessel’s battery room and the lessons learned.
What happened?
Smoke was observed in the battery room of a vessel alongside. The fire detection alarm went off on the bridge. A visual check at the scene confirmed visible smoke. The general fire alarm was promptly raised, initiating an organized muster and emergency response.
The event was brought under control by the onboard firefighting teams. Ventilation to the area was controlled and the relevant electrical circuits were isolated. The source of the smoke was identified as a set of overheated Nickel-Cadmium (Ni-Cd) batteries used for one of the UPS’s (Uninterruptible Power Supplies) for the vessel’s DP system. All damaged batteries were manually disconnected, removed and submerged in galvanized containers filled with water for cooling and containment.
The batteries involved were manufactured in 2021. The batteries of this brand and type had been specifically selected for their robustness and resilience against higher ambient temperatures. The affected cabinet contained 32 Ni-Cd batteries configured across 4 shelves. Evidence of localized heating and off-gassing was observed without open flame. Closer investigation or investigation after the event showed chipping of plastic casings, likely from transport or installation.
The incident was contained without any injury or escalation. The on-board fire-fighting teams involved were medically checked as a precaution and returned to full duty later that evening.
What went wrong?
What went right?
Lessons learned
Enhanced understanding of battery-related risks
Importance of detection and documentation
Equipment design and accessibility
Fire preparedness and training
Technical system improvements
Source: IMCA
