| MSHA's Accident Prevention Program
Tire Explosion Hazards Due to Heat
|Mine Type: All mines, surface and Underground|
|Category: Fire and Haulage and Transportation|
Heating a mounted tire and rim assembly, intentionally or not, can cause the tire to explode. Causes include:
- Welding, cutting, or grinding on the rim.
- Heating the wheel hub or brake drum.
- Malfunctioning wheel bearings or dragging brakes shoes.
- Lightning strikes or contact with power lines.
In situations where a tire assembly has been heated:
- If a fire or overheating is suspected, move away quickly to a safe location. Trajectory hazards are greater to the sides of the tire assembly, but debris can be blown in any direction.
- Keep all persons a safe distance from the tire assembly.
- Keep in mind that there can be a significant time delay until an explosion occurs. Depending on the level of heat exposure, this time delay may be several hours.
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