1. Portable Fire Extinguisher Overview
Safety Training
Fire Basics
Classes of Fire
Portable Fire Extinguisher Overview
Extinguishing a Fire

2. FIRE – it is a chemical reaction that takes place between fuel, heat and oxygen in form of light and noticeable heat.

3. HOW FIRE BURNS? Fire occurs whenever a given material is heated on the presence of oxygen to a temperature corresponding to the ignition point of the material.

4. ELEMENTS OF FIRE
FUEL
OXYGEN
HEAT

5. FUEL – any substance that will burn when heated or hot enough in the presence of sufficient oxygen.

6. OXYGEN – atmosphere consists of 21% of oxygen, 78% nitrogen and 1% of other elements.

7. HEAT
Three Stages: 1. Flash point – lowest temperature at which a flammable substance will give off vapor that will ignite when a flame or spark is introduced in the presence of sufficient oxygen. 2. Fire point – a temperature which is a few degrees higher than a flash point in which a flammable substance will continue to burn after it has been ignited. 3. Ignition point – a temperature which is higher than a fire point at which a substance is heated to give off vapor that will burn without the application of spark or a flame in the presence of sufficient oxygen.

8. FIRE TRIANGLE
OXYGEN
HEAT
FUEL

9. Breaking the Fire Triangle
OXYGEN
HEAT
FUEL
Removal of Fuel:
Shut off fuel supply
Jettisoning or relocation
Reduction of Heat:
Use something that will absorb heat
Water is the best cooling agent
Control of Oxygen:
Closing ventilation
Displace or dilute oxygen by means of CO2
Blanketing

10. CLASSES OF FIRE Class “A” – combustible materials
Characteristics – deep seated, leave ash and embers.
Extinguishing method – cooling
Class “B” – flammable liquid, gases, greases and similar products.
Characteristic – surface burning.
Extinguishing method – cut off oxygen supply or prevent flammable vapor from being given off.
Class “C” – electrical fires
Characteristic – electrical shock
Extinguishing method – use non-conducting extinguishing agent.
Class “D” – combustible metal fires