The document discusses fire prevention and fire extinguishers. It explains the fire triangle of oxygen, heat, and fuel that is needed for a fire. It also classifies fires into categories A through D based on the type of fuel burning and which type of fire extinguisher should be used for each class.

1. FIRES
FOL- PREVENCIÓN DE RIESGOS

2. FIRES
The Fire Triangle.
In order to understand how fire extinguishers work, you first need to know a little bit
about fire. Four things must be present at the same time in order to produce fire:
1. Enough oxygen to sustain combustion,
2. Enough heat to raise the material to its ignition temperature,
3. Some sort of fuel or combustible material, and
4. The chemical, exothermic reaction that is fire.

3. FIRES
Oxygen, heat, and fuel are frequently referred
to as the "fire triangle." Add in the fourth
element, the chemical reaction, and you
actually have a fire "tetrahedron."
The important thing to remember is: take any
of these four things away, and you will not
have a fire or the fire will be extinguished.
Fire safety, at its most basic, is based upon
the principle of keeping fuel sources and
ignition sources separate.

4. FIRES
CLASSIFICATION OF FUELS:
Not all fires are the same, and they are
classified according to the type of fuel that is
burning. If you use the wrong type of fire
extinguisher on the wrong class of fire, you
can, in fact, make matters worse. It is
therefore very important to understand the
four different fire classifications.

5. FIRES
CLASSIFICATION OF FUELS:
Class A - Wood, paper, cloth, trash, plastics
Solid combustible materials that are not
metals. (Class A fires generally leave an Ash.)

6. FIRES
CLASSIFICATION OF FUELS:
Class B - Flammable liquids: gasoline, oil,
grease, acetone
Any non-metal in a liquid state, on fire. This
classification also includes flammable
gases. (Class B fires generally involve
materials that Boil or Bubble.)

7. FIRES
CLASSIFICATION OF FUELS:
Class C - Electrical: energized electrical
equipment
As long as it's "plugged in," it would be
considered a class C fire.
(Class C fires generally deal with electrical
Current.)

8. FIRES
CLASSIFICATION OF FUELS:
Class D - Metals: potassium, sodium,
aluminium, magnesium
Unless you work in a laboratory or in an
industry that uses these materials, it is
unlikely you'll have to deal with a Class D fire.
It takes special extinguishing agents (Metal-X,
foam) to fight such a fire.

9. FIRES
CLASSIFICATION OF FUELS:
Most fire extinguishers will have a pictograph
label telling you which classifications of fire
the extinguisher is designed to fight. For
example, a simple water extinguisher might
have a label like the one below, indicating that
it should only be used on Class A fires.

10. FIRES
HOW TO USE A FIRE EXTINGUISHER
It's easy to remember how to use a fire
extinguisher if you can remember the
acronym PASS, which stands for Pull, Aim,
Squeeze, and Sweep.

11. FIRES
HOW TO USE A FIRE EXTINGUISHER
Pull the pin.
This will allow you to discharge the
extinguisher.

12. FIRES
HOW TO USE A FIRE EXTINGUISHER
Aim at the base of the fire.
If you aim at the flames (which is frequently
the temptation), the extinguishing agent will
fly right through and do no good. You want to
hit the fuel.

13. FIRES
HOW TO USE A FIRE EXTINGUISHER
Squeeze the top handle or lever.
This depresses a button that releases the
pressurized extinguishing agent in the
extinguisher.
.

14. FIRES
HOW TO USE A FIRE EXTINGUISHER
Sweep from side to side
until the fire is completely out. Start using the
extinguisher from a safe distance away, then
move forward. Once the fire is out, keep an
eye on the area in case it re-ignites.
.

15. FIRES

16. FIRES-TEST
1- WHAT IS THE MEANING OF THE LETTER “B” IN A FIRE EXTINGUISHER :
a. burn
b. bubble
c. bomb
d. bright
2- WHAT CLASS OF FIRE EXTINGUISHER SHOULD WE USE WITH SOLID COMBUSTIBLE MATERIALS ?
a. A
b. B
c. C
d. D
3- OXYGEN, HEAT, AND FUEL ARE FREQUENTLY REFERRED TO AS THE ?
a. Fire tetrahedron
b. Fire triangle
c. Fire extinguishers
d. Fire causes
4- FIRES ARE CLASSIFIED ACCORDING TO :
a. Their colour
b. Their size
c. The fuel that is burning
d. The paper that is burning
5- CLASS C FIRES GENERALLY DEAL WITH
a. Current
b. Cold
c. Combustible
d. Components

17. FIRES-TEST
6- THE ACRONYM PASS STANDS FOR ……
a. Press, Aim , Squeeze, Sweep
b. Pull, Aim , Squezze , Sweep
c. Push , Aim , Swot , Sweep
d. Pull, Attack, Squeeze, Sweep
7- WHAT CLASS OF FIRE EXTINGUISHER SHOULD WE USE WITH ELECTRICAL COMPONENTS ?
a. A
b. B
c. C
d. D
8- WHAT ELEMENTS ARE PART OF THE FIRE TRIANGLE ?
a. Oxygen, Heat , Fuel
b. Oxygen , Heat, Combustion
c. Oxygen, Petrol , Gas
d. Oxygen , Wood, Fuel
9- ARE ALL THE FIRES THE SAME ?
a. Yes they are
b. Sometimes
c. Most of the times
d. No they are not
10 - CLASS D FIRES GENERALLY DEAL WITH
a. Metals
b. Fuels
c. Combustible
d. Paper

18. FIRES-TEST
11- WHAT DO WE NEED TO PULL THE PIN IN A FIRE EXTINGUISHER ?
a. To clean the área
b. To discharge the extinguisher
c. To open the pin
d. To sweep the área
12- WHAT CLASS OF FIRE EXTINGUISHER SHOULD WE USE WITH FLAMABLE LIQUIDS ?
a. A
b. B
c. C
d. D
13- WHAT ELEMENT IS NOT A PART OF THE FIRE TRIANGLE ?
a. Fuel
b. Gas
c. Heat
d. Oxygen
14- WITH A FIRE EXTINGUISHER YOU SHOULD AIM AT ?
a. The flames
b. The fire
c. The base
d. The place
15 - CLASS D FIRES GENERALLY DO NOT DEAL WITH
a. Potassium
b. Sodium
c. Wood
d. Magnesium