HIAD events | Clean Hydrogen Knowledge Hub

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07/09/1987
Japan

unintended hydrogen formation from metallic powder

Event ID: 640
Quality: 3
Application: Steel and metals industry
Component involved: chemical storage tank
Hydrogen supply chain stage: Unintended hydrogen production - chemical reaction
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

03/08/1981
Japan

Continuous release in open atmosphere

Event ID: 639
Quality: 2
Application: Petrochemical industry
Component involved: heat exchanger (flange)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/05/2025

05/05/1973
United States

Fire in a refinery

Event ID: 638
Quality: 4
Application: Petrochemical industry
Component involved: flange (generic)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

17/05/1984
Japan

Leakage from a valve in a heavy-oil hydro-desulphurisation unit

Event ID: 637
Quality: 3
Application: Petrochemical industry
Component involved: valve (weld)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: release, no ignition
Classification of the physical effects: Unignited Hydrogen Release
Date entry in HIAD: 05/06/2027

14/02/1985
Japan

Fire - hydrogen

Event ID: 636
Quality: 3
Application: Petrochemical industry
Component involved: pipe (generic)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

01/01/1976
United States

Explosion at the off-gas system of a nuclear power plant

Event ID: 635
Quality: 2
Application: Power plant
Component involved: off-gas system
Hydrogen supply chain stage: Unintended hydrogen production - radiolysis
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 28/01/2026

18/05/1985
Japan

Explosion in the chlorine line of a sodium hydroxide electrolysis unit

Event ID: 634
Quality: 3
Application: Chemical industry
Component involved: valve (generic)
Hydrogen supply chain stage: hydrogen as by-product
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

07/07/1986
Japan

Fire on the a hydrogen flange in a synthetic adhesives production plant

Event ID: 633
Quality: 3
Application: Chemical industry
Component involved: flange (bolts)
Hydrogen supply chain stage: Hydrogen as feedstock
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

30/06/1986
Japan

Fire - hydrogen

Event ID: 632
Quality: 4
Application: Unknown
Component involved: CGH2 cylinder(s)
Hydrogen supply chain stage: Hydrogen transfer
Nature of the consequences: explosion followed by a fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/05/2025

08/07/1987
Japan

Fire in the catalytic reformer operation

Event ID: 631
Quality: 3
Application: Petrochemical industry
Component involved: valve (generic)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/05/2025