Discussion
Arrange the elements of a dust explosion in the order they must come together:
1. Combustible dust is generated at a transfer point
2. The dust is dispersed as a suspended cloud
3. The cloud is confined within an elevator leg or bin
4. An ignition source such as a hot bearing initiates it
Select the correct sequence.
Answer: B
Correct answer: 1, 2, 3, 4
The elements must come together in this order. Combustible dust is generated at a transfer point (1); it is then dispersed as a suspended cloud (2), since settled dust cannot explode.
The cloud must be confined within an elevator leg or bin (3), because without confinement the pressure cannot build and the result is a flash fire rather than an explosion. Finally an ignition source such as a hot bearing initiates it (4). Removing any one element breaks the chain, which is why control works on several at once.
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