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chapter 5<br />
Fully developed<br />
compartment fi re<br />
and decay period<br />
A fl ashover results in a fully developed compartment fi re.<br />
During a fully developed compartment fi re some of the combustion<br />
will take place outside the compartment. This is actually<br />
due to the fact that the fi re is ventilation controlled, which<br />
means that it produces an excess of combustible gases. As a<br />
result of this, fl ames will escape out through the building’s<br />
openings.<br />
A fully developed compartment fi re can last for a long time,<br />
even several hours sometimes, mainly depending on the<br />
amount of fuel there is in the compartment. Temperatures of<br />
800–900 °C are common. As long as there is fuel available in<br />
the compartment and access to oxygen for combustion, the<br />
temperature will remain at that level.<br />
Temp<br />
Early stage of fire<br />
development<br />
Flashover<br />
Fully developed compartment fire<br />
Oxygen deficiency<br />
Decay period<br />
Time<br />
Figure 75. Smoke gas<br />
temperature during the<br />
fi re’s various stages.<br />
111
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