FLAMMABLE GASES AND VAPOURS
Flamable Gas & Vapour EEHA Inspection & Hazardous Area Classification
GASES AND VAPOURS
Gases and Vapours (and Mists) mix more or less homogeneously with air and form flammable mixtures relatively quickly.
While this is obvious for gases, vapours can travel very quickly and form flammable or explosive mixture with air in a very short time frame.
Some hydrocarbon liquids have lower explosion limits of not much more than 1% (which includes Unleaded Petrol) which makes there vapours particularly dangerous.
Three things need to be present for gas or vapour in air mixtures to be flammable or explosive:
- Sufficient fuel to be within the flammable range in air
- Air (or sufficient Oxygen to allow ignition)
- An ignition source of sufficient energy or temperature to allow ignition to initiate and continue.
Most explosion protection techniques work by removing at least one arm of the Ignition Triangle.