Multi-Fuel Vessel: LNG Bunker-Area Coverage
An LNG-fuelled PCTC asked whether the same sensor architecture could extend coverage into the bunker-adjacent spaces. The answer was yes, with limits.
An LNG-fuelled PCTC asked whether the per-vehicle architecture could extend into the bunker-adjacent corridor — the spaces between the LNG storage and the nearest vehicle deck. The motivation was operational, not regulatory: a single observability layer is cheaper than two.
What we adapted
- Sensor housings with ammonia-tolerant gasket spec (forward-compatible with planned ammonia conversion).
- Alarm hierarchy split into zones — bunker-area alarms route via a different escalation path than vehicle-deck alarms.
- Calibration windows lengthened to match the cleaner thermal environment of the bunker corridor.
What did not transfer
- Cross-cell coherence — the bunker corridor does not have the cargo density to support it.
- Per-vehicle baseline logic — replaced with a per-zone baseline.
- The thermal grid alone — the bunker area also needs dedicated LNG leak detection (it has one).
How RoRoSAFE helps
This case tested how far RoRoSAFE's sensor architecture extends into spaces next to an LNG bunker, and found limits as well as possibilities. Its core purpose is per-vehicle fire detection on the vehicle decks; fuel-gas detection remains a separate, required system. Operators of multi-fuel ships should scope any extension case by case, as this pilot did.
Pilot: one deck · installed alongside the berth · no drydock · 6 months of dashboard access
Questions, answered
Can the per-vehicle architecture extend into LNG bunker-adjacent spaces?+
Yes, with limits. An LNG-fuelled PCTC extended coverage into the corridor between LNG storage and the nearest vehicle deck — motivated operationally, since a single observability layer is cheaper than two. The architecture validated with zone-segregated alarms.
What was adapted for the bunker-adjacent corridor?+
Sensor housings with an ammonia-tolerant gasket spec (forward-compatible with planned ammonia conversion), an alarm hierarchy split into zones so bunker-area alarms route via a different escalation path than vehicle-deck alarms, and longer calibration windows matched to the cleaner thermal environment of the corridor.
What did not transfer to the bunker area?+
Cross-cell coherence (the corridor lacks the cargo density to support it) and per-vehicle baseline logic (replaced with a per-zone baseline). The thermal grid also does not replace dedicated LNG leak detection, which the bunker area still needs. Conflating bunker monitoring with vehicle-deck monitoring is a category error.
Continue the thread
How Multi-Fuel PCTCs Change the Deck
Ammonia detection alarms at 25 ppm, far below anything that burns. On a multi-fuel PCTC the sensing priority inverts from fire to toxicity.
Detection Implications of Ammonia-Ready PCTCs
Ammonia does not interfere with the hydrogen channel. The interference that matters is between H2 and CO — and both are thermal-runaway markers.