Hazard Analysis
How HAZID Works for Green Hydrogen Facility Siting
Vinit Pandey · Published 4 August 2026
In short: HAZID for green hydrogen facilities identifies siting and layout hazards early, driven by hydrogen's wide flammability range, low minimum ignition energy, and high buoyancy, so that electrolyser, compression, and storage placement can account for these hazards before detailed design is finalised.
Key takeaways
- Hydrogen's wide flammability range and low ignition energy demand tighter early-stage hazard screening
- High buoyancy changes how HAZID should consider dispersion and accumulation in enclosed spaces
- Hydrogen embrittlement should be flagged at HAZID stage for further materials engineering assessment
- Indian hydrogen facility siting regulation is still evolving, so international codes often inform HAZID benchmarking
Hydrogen's flammability range in air (roughly 4% to 75% by volume) is far wider than most hydrocarbon fuels, and its minimum ignition energy is very low, meaning even small leaks that would be inconsequential for other fuels can present a credible ignition hazard — a factor that must shape equipment spacing decisions at the HAZID stage.
Because hydrogen is far more buoyant than air, HAZID for hydrogen facilities considers vertical dispersion and potential accumulation in enclosed or semi-enclosed spaces (such as under canopies or in electrolyser buildings) differently than for heavier hydrocarbon gases.
High-pressure hydrogen storage introduces material compatibility considerations — hydrogen embrittlement of certain steels — that HAZID should flag for further engineering assessment alongside conventional overpressure and fire hazard screening.
Because green hydrogen facility siting regulation in India is still an evolving area compared to established petrochemical siting guidance, HAZID findings often need to be benchmarked against international hydrogen-specific codes and standards in the absence of a single settled domestic framework.