Glossary · Hazards and harm
Explosion hazard
In machine safety, an explosion hazard is a condition with the potential for a rapid release of pressure and energy, for example from the ignition of an explosive atmosphere of gas, vapor or dust, or from the failure of a pressurized component.
- Machine safety
- Risk assessment
In one sentence
An explosion hazard covers explosive atmospheres of gas, vapor or dust and bursting pressurized parts, both of which release energy suddenly.
Example
A grinding machine for aluminum parts collects fine dust in its extraction unit; the risk assessment covers ignition sources, and the filter housing is designed with explosion venting.
How it applies
- Machine safety: Consider explosive atmospheres (gas, vapor, mist, dust) and physical explosions of pressure vessels, hydraulic accumulators or batteries, which hold stored energy. Avoiding the atmosphere comes first, then avoiding ignition sources, then limiting the effects.
- Integrated systems: Explosion hazards often arise at interfaces. An extraction unit, dust collector or solvent supply added to a machine changes the risk assessment of the whole line.
- Technical documentation: Specify permitted materials and media, cleaning intervals for dust deposits, and areas where ignition sources are prohibited. Separate rules for equipment in explosive atmospheres may apply in addition to machinery law; check them for the product.
- Evidence: Record the assumptions about concentrations, ignition sources and zone boundaries, so that a change of material or process triggers a review.
Explosion hazard vs. fire hazard
A fire hazard involves sustained combustion; an explosion is a sudden release of pressure. A fire can trigger an explosion and vice versa, and dust deposits are relevant to both.