Why CO₂ Flooding Stopped Being the Answer After Felicity Ace
The NTSB report on Felicity Ace reads like a case study in fixed-system design failure. The fix is not "more CO₂" — it is sealing and detection.
CO₂ flooding has been the deep-deck suppression standard on PCTCs for decades. The 2022 Felicity Ace casualty did not invalidate the chemistry — it invalidated the integration. The NTSB-published findings name a faulty garage door design that prevented the crew from sealing the affected zone, with the result that the CO₂ release was effectively bled into the surrounding spaces.
The failure chain
- Detection lag — fire was already developed before alarms triggered.
- Sealing failure — garage door geometry prevented full closure.
- CO₂ released into a non-sealed volume — concentration never reached suppression threshold.
- Crew re-entry against protocol — two firefighters lost in CO₂-charged smoke.
What the trade has done since
- Class-society scrutiny on deck-sealing geometry has tightened.
- Fixed-system audits now include the seal-before-release procedure end to end.
- Detection upgrades are being prioritised so that sealing decisions happen before the fire has propagated.
Sources
- Panama Maritime Authority — Felicity Ace casualty investigation (primary investigative jurisdiction).
- IMO — FSS Code Chapter 5, Fixed Gas Fire-Extinguishing Systems.
- DNV — "CO2 Fixed Systems on PCTCs — Lessons from Recent Casualties."
- TradeWinds — MOL Felicity Ace post-casualty coverage (2022–2024).
- Lloyd's List — post-Felicity Ace insurance and salvage analysis.
- [VERIFY: "Garage-door geometry preventing full closure" — language widely used in industry briefings; exact wording subject to confirmation in the formal investigation report.]
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