Fire Behavior Flashcards
1
Q
Definition of backdraught?
A
Limited ventilation of a fire will lead to flammable fire gases being produced. If air is admitted through an opening in the compartment it can lead to a sudden deflagration, moving through the compartment and out of the opening.
2
Q
Signs and symptoms of backdraught?(8)
A
Fire with limited/no ventilation Hot doors and windows Pulsating smoke through gaps Soot blackened windows Air/smoke drawn into openings Ghost flames Lack of flames Change in fire conditions (darkening of smoke colour)
3
Q
Definition of flashover
A
The stage where total thermal radiation causes all exposed combustibles to pyrolyse and ignite.
The transition from a growing fire to a fully developed fire.
4
Q
Signs and symptoms of a flashover?(7)
A
Well ventilated fire High heat conditions Ghost flames over head Sudden lowering of smoke layer Rapidly rising temperatures Low level materials pyrolising Change in fire conditions
5
Q
Fire gas ignition definition?
A
Compartment fire gases mix with air in adjacent compartments which may then fall between its flammable limits causing it to ignite creating pressure with or without explosive force
