Structural Firefighting Flashcards

1
Q

What are the (4) sides of the fire tetrahedron?

A
  1. Heat
  2. Oxygen
  3. Fuel
  4. Chemical Reaction
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2
Q

Define flashover?

A
  • Flashover may occur where a large amount of combustible gas is produced, in an environment with adequate oxygen supply
  • These gases are subsequently heated to their ignition temperature
  • This results in all combustible material in the compartment catching fire.

Goes from ‘a fire in a room’ to ‘a room on fire’

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3
Q

What is B-SAHF and what does it stand for?

B(2) - S(5)A(4)H(3)F(1)

A

Its used for reading a structural fire.
Building (style and materials)
Smoke (volume, velocity, density, colour & neutral plane)
Air Track (inlets/outlets, velocity, direction & pulsations)
Heat (blackening, blistering & sudden heat build-up)
Flame (colour)

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4
Q

What are the (3) structural methods of attack?

A
  1. Direct
  2. Indirect
  3. Gas cooling

*Transitional may be a 4th

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5
Q

Define Auto Ignition Temperature (AIT)?

A

The minimum temperature required to cause self-sustained combustion in any substance, in the absence of a spark or flame.

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6
Q

What are the (3) extreme fire behaviours?

A
  1. Flashover
  2. Backdraught
  3. Fire Gas Ignition
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7
Q

Define backdraught?

A
  • Occurs when oxygen is introduced to a room containing a severly under ventilated fire (depleted of adequate air) and large volumes of unignited super-heated gas.
  • The oxygen combines with the superheated gases causing it to enter its flammability range and explode
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8
Q

Define Fire Gas Ignition?

A

When flammable fire gases already in their flammability range travel to other areas of a structure and are ignited by an ignition source (such as travelling embers).

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