Q4 Lesson 3 Flashcards
Stages of Fire
- Ignition Stage
- Growth
- Fully Developed
- Decay/Burnout
Fuel and oxygen are exposed to heat, resulting in a sustained chemical reaction. At this stage, the fire can still be controlled by removing one of the elements of fire. The fire can be controlled using a fire extinguisher.
Ignition Stage
The initial flame become another source of heat and additional fuel ignites. The heat is transferred through convection and radiation which ignites more combustible materials.
Growth
With presence of more heat coming from the fire itself, the fire spreads and consumes all available fuel. The temperature reaches its peak, and oxygen and other materials are consumed rapidly.
Fully Developed
When the fire consumes all available fuel, the temperature decreases. Since the heat as an element of fire ceases, the fire gets less intense.
Decay/Burnout
It’s an active fire protection device used to extinguish or control small fires, often in emergency situations. It is not intended for use on an out-of-control fire.
Fire Extinguisher
P.A.S.S.
P-ull the pin
A-im at the base of the fire
S-queeze the handle/lever
S-weep from side to side
Types of Extinguishers
- Water (Solid Red)
- Foam (Cream)
- Powder (Blue)
- CO2 (Black)
- Wet chemical (Yellow)
Used on paper, wood, coal, cardboard, and other solid fuel fires
Water (solid red)
Used on solid fuel fires as well as flammable liquids.
Foam (cream)
Used on any kind of fire except for Class F cooking oils.
Powder (blue)
Used on flammable liquids and electrical fires.
CO2 (black)
Used on cooking oil fires as well as combustible solid materials.
Wet Chemical (Yellow)
The uses of fire extinguishers
Water (solid red) - Class A
Foam (Cream) - Class A, B
Powder (Blue) - Class A, B, C, D, Electrical
CO2 (Black) - Class B, Electrical
Wet chemical (Yellow) - Class A, F
The Classes
Class A: Combustible materials (paper, textiles, wood, similar materials)
Class B: Flammable liquids (petrol, oil, paint)
Class C: Flammable gases (butane, methane)
Class D: Flammable metals (potassium, uranium)
Electrical: Electrical goods (appliances in kitchens, computers, phones etc.)
Class F: Cooking oils (chip pan fires and deep fat fryers)
