Consequence Analysis
How Fire and Explosion Risk Assessment Works for Hydrogen Storage
Vinit Pandey · Published 4 August 2026
In short: Fire and Explosion Risk Assessment for hydrogen storage must account for hydrogen's near-invisible flame, high flame speed in congested or confined layouts, and tendency toward deflagration-to-detonation transition under certain conditions, which differ materially from hydrocarbon fire and explosion behaviour.
Key takeaways
- Hydrogen's near-invisible flame changes detection system and thermal radiation modelling assumptions
- High laminar burning velocity increases deflagration-to-detonation transition risk in congested layouts
- Unignited high-pressure vessel rupture is itself a blast scenario requiring separate modelling
- FERA findings often justify hydrogen-specific spacing and detection rather than generic hydrocarbon standards
Hydrogen jet fires burn with a nearly invisible flame in daylight and radiate less in the visible spectrum than hydrocarbon fires of similar heat release, which affects both detection system selection and the assumptions used in thermal radiation modelling for personnel safety distances.
Vapour cloud explosion modelling for hydrogen must account for its high laminar burning velocity, meaning congestion and confinement in a hydrogen facility layout can accelerate flame speed toward deflagration-to-detonation transition more readily than for many hydrocarbon vapours at comparable concentrations.
High-pressure hydrogen storage vessels introduce a distinct rupture consequence: rapid depressurisation from a high-pressure store can itself generate significant blast effects even without combustion, a scenario that FERA for hydrogen must model alongside ignited-release cases.
FERA findings for hydrogen storage commonly drive specific layout decisions — increased equipment spacing, open or well-ventilated storage configurations, and hydrogen-specific gas detection — rather than relying on generic hydrocarbon facility spacing standards.