Structural

Question 1

What does B-SAHF stand for?

Answer 1

Building
Smoke
Air
Heat
Flame

Question 2

What are the 4 stages of compartment fire?

Answer 2

1. Developing
2. Flashover (transitional)
3. Fully Developed
4. Decay

Question 3

Define the developing stage of compartment fire?

Answer 3

• Fire is small compared to the size of the compartment.
• Fire has adequate oxygen and is not confined by the sized of the compartment.

Question 4

What are the (4) types of heat transfer?

Answer 4

1. Conduction
2. Convection
3. Radiaition
4. Direct Burning

Question 5

Descibe how conduction contributes to the spead of fire?

Answer 5

• The transfer of heat through a solid material, from a region of higher temperature to a region of lower temperature.
• Heat can be conducted from the fire compartment to other compartments.

Question 6

Descibe how convection contributes to the spead of fire?

Answer 6

• Convection is heat transfer due to the mass movement of the heated molecules/gases within a liquid or gas.
• Majority of heat movement and spread throughout a structure.
• Hot gaseous products of combustion and pyrolysis mix with air, expand and rise rapidly carrying the hot air away from the seat of the fire.

Question 7

Descibe how radiation contributes to the spead of fire?

Answer 7

• Waves carry energy away from the emitting object.
• Aids fire spread across a surface and promotes ignition of other fuels.

Question 8

Descibe how direct burning contributes to the spead of fire?

Answer 8

• Direct contact between the flame and the material.
• Flames contact other fuel sources which then also catch fire.

Question 9

Define the flashover stage of compartment fire?

Answer 9

• Materials in compartment heat to their autoignition temperature and emit flammable gases.
• Rapid ignition of these gases and all combustible material occurs.

Question 10

Define the fully developed stage of compartment fire?

Answer 10

• Flashover has occurred.
• Heat release rate has peaked.
• Everything combustible within the compartment is on fire.
• Average temperature may range from 700 to 1200°C.

Question 11

Define the deacy stage of compartment fire?

Answer 11

• All available fuel has been consumed.
• Rate of heat release has declined.