Safety Technical Indices
In the context of this purely informal overview a set of safety-relevant characteristics are to be introduced which should be known for the characterisation of inflammable solids and dusts in respect of the safety-relevant interpretation of plants.
It pertains to this:
- Burning behaviour (Combustibility Indey, Burn-up Rate, Smoldering Point,......),
- Autoignition (Warm storage, Glow temperature,......),
- Explosion Limits (Explosibility, LEL und UEL),
- Electostatic Technical Indices (Resistance, Conductivity......),
- Minimum Ignition Energy (MIE),
- Minimum Ignition Temperature,
- Maximum Explosion Pressure (Pmax)
- Maximum rate of Pressure rise (KSt).
- Limiting Oxygen Concentration.
- In detail the characteristics are defined briefly, the appropriate testing methods are presented and a description of the safety-relevant meaning of characteristic numbers are given.
Autoignition - Glow Temperature
The glow temperature describes the minimum ignition temperature of a dust layer with a one-sided thermal load.
Explosibility (Dust Explosibility)
A dust is dust explosionable, if its mixture with air can be initiated by effect of an ignition source of defined energy to a keeping flame propagation. This is connected with a pressure increase in the closed container.
Lower and Upper Dust Explosion Limits
The Dust Explosion Limits describe the concentration range of types of dusts with air, within an explosion is possible.
The Combustibility Index (CI) characterizes the fire and combustion behavior of a material.
The burn-up rate describes the maximum propagation speed of the burn zone of solids.