Due to the design features, the vertical conveyors for free-flowing materials are characteristic to create favourable conditions for the explosion of a dust-air mixture. They contain a closed volume, combustible dust in suspension and a number of possible sources of ignition.
The most common sources of ignition in bucket elevators are:
- Sparks when buckets collide with body
- Sparks from the electric motor
- Friction heated surfaces
- Smoldering particles entering through the transport system
- Bearings overheating