STAGES OF FIRE COMBUSTION

 

STAGE 1:INDUCTION

Heat Produces sufficient vapour which can mix with air above the fuel and generate a flammable mixture.

STAGE 2: IGNITION

Initiates the reaction and, if it becomes self -sustaining and no longer requires an external heat source, combustion develops very quickly and there is a dramatic increase in temperature.

STAGE 3: FIRE GROWTH

a) Rapid development of fire as burning material act as ignition

b) Level of burning and growth depend on levels of oxygen and fuel present

c) Large volumes of smoke and heat generated and possibly spontaneous combustion

d) Growth rate and temperature will eventually reach a plateau

STAGE 4: STEADY STATE

The temperature stabilises and the combustion process reaches a steady state ( the reaction between the fuel and oxygen is balanced until all the fuel is consumed).

STAGE 5: DECAY

Begins when either the fuel or oxygen has been consumed, the fire will then extinguish and gradually cool down.

 

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