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Safety

Engineering Ammonia Safety for Mobility

A controlled system designed around containment, detection, isolation and mitigation, with controlled depot refuelling and a staged validation plan.

Ammonia is hazardous and requires specialised storage, handling and operating controls. H2ONE's vehicle fuel system remains under engineering development and validation.

Safety layers Engineering notes
1 · Containment

Current packaging concept: an isolated, sealed safety enclosure.

The current packaging study places the 10 kg NH₃ vessel in an isolated, negatively ventilated enclosure separated from the occupant space. Final location remains subject to crash, packaging, dispersion and regulatory validation.

  • Pressure-rated vessel with isolation valves at the vessel
  • Protected fuel line routed outside the occupant space
  • Ammonia-compatible materials throughout the fuel path
  • Fuel conditioning and the DAFC in a separate rear bay
  • External manual shutoff and refuelling receptacle

Target Concept architecture under development. No vehicle-level safety test has been completed yet.

2 · Mitigation

Ventilate, treat, and discharge under control.

The enclosure is continuously ventilated at slightly lower pressure than its surroundings, so a leak is drawn away from the occupant space, treated where possible and released through a controlled discharge.

Ammonia vapour behaviour depends on release conditions. A pressurised liquid release can form a cold aerosol/vapour cloud that may remain near ground level initially before warming and dispersing. H2ONE therefore does not rely on buoyancy alone; enclosure ventilation, controlled discharge, gas detection and dispersion validation are required.
3 · Detection

What the system watches.

NH₃ concentration
Enclosure ventilation
Fuel pressure & temperature
Fuel flow
Stack temperature
Cell voltage & current
Crash / tilt
Loss of power

Target Multiple NH₃ detection points, with warning and shutdown thresholds set at or below occupational exposure limits. Every event is logged.

4 · Isolation

Faults should create predictable action.

Keep scrolling to play a simulated leak inside the enclosure.

  1. NH₃ detected
  2. Warning
  3. Fuel supply isolated
  4. Stack current reduces
  5. Enclosure purged
  6. Controlled shutdown
  7. Event logged

The intended response: the release is held in the enclosure, the fuel supply is isolated and the enclosure is purged through a controlled discharge.

Simulated Illustrative sequence, not a test result. Hardware interlocks are designed to act independently of software and connectivity.

5 · Controlled refuelling

Depot first. Public infrastructure later.

Only trained staff at a controlled depot, using closed-connection couplings, with leak checks before and after every fill. No public refuelling in the first deployments.

1
1 engineering vehicle
2
5-vehicle controlled pilot
3
20-vehicle monitored fleet
4
Broader fleet / OEM deployment
6 · Validation plan

Safety is proven in stages, and reported openly.

1Component & leak testsVessel, valves, fittings, line
2Detection & shutdownSensor and isolation response time
3Release & dispersionModelling, then controlled testing
4Vibration & durabilityFuel system on a duty cycle
5Crash & packagingLocation and protection review
6Dyno & depot trialsControlled operation
7Independent validationThird-party testing & approvals

Target Results will be labelled experimental, simulated or target, and setbacks reported early.

Safety engineering notesAmmonia properties, exposure limits and alarm set-points, the Indian and international standards we design against, handling practice, investor FAQ and sources.
Read the notes