Extinguishers

Question 1

4 main types

Answer 1

Water
Foam
Dry powder
Co²

Question 2

Colours of the 4

Answer 2

Water signal red
Foam pale cream
Power French blue
Co² black

Question 3

What class can use water on

Answer 3

Class A
Solids (wood, paper, furnishing)

Question 4

Class to use on foam on

Answer 4

A + B
Solids and flammable liquids

Question 5

Class to use dry powder on

Answer 5

A B C D
Solids, flammable liquids, gases, metals

Question 6

Class to use co² on

Answer 6

B C D
Flammable liquids, gases, metals

Question 7

Class A

Answer 7

Solids
Wood, paper, coal, textiles, furnishings

Question 8

Class B

Answer 8

Flammable liquids
Oils, diesel, wax, grease, sprirts, oil based paints

Question 9

Class C

Answer 9

Gases
Natural gases, hydrogen, camping gases, propane, butane, methane

Question 10

Class D

Answer 10

Metals
Aluminum, magnesium, potasium

Question 11

Class F

Answer 11

Cooking oils and fats

Question 12

Properties of water

Answer 12

6-9 litres
Capacity over 5 litres should last 60 secs
Jet of 7m spray 4 m
10 bar pressure
Should discharge 95%
Length of hose 80%of body

Question 13

Advantages and disadvantage of water

Answer 13

Advantages
Cools and extinguishers sold fuel fires quickly
Can be used as jet or spray

Disadvantages
Not to be used on electrical fires
Not to be used on cooking fats

Question 14

Properties of foam

Answer 14

6- 9 litres
5 litres should last 30 seconds
10bar pressure
95% discharge
Self aspiration or non aspirating

Question 15

Advantages and disadvanges of foam

Answer 15

Advantages
Cools and smoothers fires
Can be used on flammable liquids

Disadvantage
Not to be used on chip pan fires
Foam blanket could break away and re ignite BURNBACK

Question 16

Properties of dry powder

Answer 16

1-12kg in size
Discharge 85%
Powder treated with a flow additive (anti caking)
Different powders for different fires
Should shake every do often to break up

Question 17

Advantages and disadvantages of powder

Answer 17

Advantages
Can be used on class A b c
Safe to use on electrical fires

Disadvantages
Does not cool
Messy in operation
Winf and moisture will effect
Visibility reduced

Question 18

Properties of Co²

Answer 18

Staves fuel of oxygen
Range from 0.9 to 6.8kg
56 bar pressure
Expansion rate 450:1
Specially shaped horn
Discharge 95%
-79 degrees on metal pipe

Question 19

Advantages and disadvantaged Co²

Answer 19

Advantages
Can be used on electrical fired
No permananted residue left
Good at penetrative enclosed spaces

Disadvantages
Little cooling capability
Noisy
Heavy
Needs to be sent away for refil

Question 20

What does water do

Answer 20

Removes heat
By cooling the surface it stops pyrolysis

Question 21

What does Co² do

Answer 21

Removes oxygen
Starvation of oxygen to the fire

Question 22

What does foam do

Answer 22

Removes heat and oxygen
Small amount of cooling
Starvation of oxygen to fire

Question 23

What does powder do

Answer 23

Removes oxygen
Smothers the fuel, it interups the chain of combustion