Powder Explosion in a Aluminum Processing Plant
The fire broke out on a worm ("vis sans fin") supplying a conveyor of aluminum. The ignition of the powder on the ground was caused by the flame cutting operation on the worm shell which generated scales. The incandescent Al dust has been then swept by the wind spread to the atomisation tunnels, the sewers and a lost well. The dust and hydrogen formed upon contact with water caused four violent explosions. The fire spread to a stock of Al powder stored in bags and drums.
Event Date
February 2, 1980
Record Quality Indicator
Region / Country
Event Initiating System
Classification of the Physical Effects
Nature of the Consequences
Causes
Cause Comments
Immediate cause was (maintenance?) work at the transportation system. Root cause is unknown, but the absence of the proper risk assessment during mechanical work at the system has plaid a role.
Facility Information
Application Type
Application
Specific Application Supply Chain Stage
Components Involved
aluminum production, aluminum powder conveyor
Location Type
Location description
Industrial Area
Pre-event Summary
This event does not belong to the hydrogen value chain.Accidental production of hydrogen was caused by the ignition of Al [powder and its subsequent coming in contact with water. The oxidation reaction of Al + H2O has caused the production and consequent ignition of H2.
Lessons Learned
Lessons Learned
Unknown
Event Nature
Emergency Action
Unknown
Detonation
No
Deflagration
No
High Pressure Explosion
No
High Voltage Explosion
No
Source Category
References
References
ARIA event 8966
https://www.aria.developpement-durable.gouv.fr/accident/8966/
(accessed August 2020)