What are the 4 stages of fire development?
Compartment fire development can be described as being comprised of four stages: incipient, growth, fully developed and decay (see Figure 1). Flashover is not a stage of development, but simply a rapid transition between the growth and fully developed stages. (see Figures 1 and 2.)
What are the 5 stages of fire?
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- Incipient. An incipient fire is a flame that is still in its beginning stage.
- Growth. As we move through the phases of a fire, we come to the second stage – growth.
- Fully Developed.
- Decay.
- Prevention in Your Building.
What is the growth stage of a fire?
Growth – The growth stage is where the structures fire load and oxygen are used as fuel for the fire. There are numerous factors affecting the growth stage including where the fire started, what combustibles are near it, ceiling height and the potential for “thermal layering”.
What are the 4 behaviors of fire?
Fire behavior can be characterized as the manner in which a fire reacts to the interaction of fuel, weather, and topography – the “fire behavior triangle.” The four main parameters used to describe fire behavior include: rate of spread, fireline intensity, flame length, and flame height.
What is Stage 4 of the 4 key stage of fire?
Stage Four – Decay The decay of a fire is the phase when the fire decreases in intensity until it is either a smolder or non-existent. If there was no suppression, this is likely when there is nothing left for the fire to burn.
What are the four stages of a fire quizlet?
The four stages of fire development are: ignition, ventilating, fully developed, and decay.
What are the three stages of fire behavior?
For both wildland and structure fires, there are three generally recognized stages of combustion (Figure 6). The incipient stage, smoldering stage, and flame stage. The incipient stage is a region Page 6 6 Module 3: Fire Behavior where preheating, distillation and slow pyrolysis are in progress.
What is Stage 2 of the 4 key stage of fire?
Stage Two – Growth Once a fire reaches this stage, it becomes harder to control. If a fire detector recognizes a fire at this point, you have little time to put it out before it reaches flashover.
What are the 5 fire indicators?
Building Factors, Smoke, Air Track, Heat, and Flame (B-SAHF) are critical fire behavior indicators. Understanding the indicators is important, but more important is the ability to integrate these factors in the process of reading the fire as part of size-up and dynamic risk assessment.
What is the first stage of a fire?
The incipient stage of the fire is the first stage of a fire, and this stage occurs immediately after ignition. This would mean that the fire has only just started, and it can be identified from the following factors: The fire has not yet affected anything beyond its immediate vicinity.
Which type of phenomenon occurs when the fire rapidly transitions from the growth stage to the fully developed stage?
Flashover
Flashover is the sudden transition from a developing to fully developed fire. This phenomenon involves a rapid transition to a state of total surface involvement of all combustible material within the compartment.
Which stage of fire occurs when all combustible materials in the compartment are burning?
Post-flashover stage. Flashover leads to the fully developed stage of a fire in which all exposed combustibles in the compartment are involved.