Release from a Hydrogen Bus
A hydrogen and fuel cells bus experienced a hydrogen detection alarm in a city centre. This triggered the evacuation of the immediate surroundings and the towing of the vehicle to the maintenance garage.
Event Date
July 30, 2018
Record Quality Indicator
Region / Country
Event Initiating System
Classification of the Physical Effects
Nature of the Consequences
Causes
Facility Information
Application Type
Application
Specific Application Supply Chain Stage
Storage/Process Medium
Currency
Lessons Learned
Lessons Learned
As corrective measure, the bus manufacturer will:1.Perform an analysis of hydrogen exhaust set up 2.Install measurement equipment (8 sensors) to measure the hydrogen concentration in exhaust and under roof panels. 3.Installation of 2 extra sensors to determine if normal sensors (8) do not react to other gasses (only Hydrogen)4.Map the Hydrogen flow (stream) via visualization of gasLESSON LEARNEDIt is important to use hydrogen sensors and detectors characterised by low cross-sensitivity to other gases. In this way, the risk of false alarm triggered by the presence of other gases is minimised. The accuracy, the alarm level and the location of the sensors are also relevant.
Detonation
No
Deflagration
No
High Pressure Explosion
No
High Voltage Explosion
No
Source Category
References
References
Report provided but confidential