Wilhelm Jost Institut Förderverein e.V.

Safety Technical Indices

General 

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

Definition:

The glow temperature describes the minimum ignition temperature of a dust layer with a one-sided thermal load.

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Explosibility (Dust Explosibility)

Definition:

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.

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Lower and Upper Dust Explosion Limits

Definition:

The Dust Explosion Limits describe the concentration range of types of dusts with air, within an explosion is possible.

 

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Combustibility Index

Definition:

The Combustibility Index (CI) characterizes the fire and combustion behavior of a material.

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Burn-up rate

Definition:

The burn-up rate describes the maximum propagation speed of the burn zone of solids.

 

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