Foam

Question 1

What is needed

Answer 1

Water
Air
Foam concentrate

Question 2

Resources needed (5)

Answer 2

Pump to impart energy
Hose to deliver water/foam soultion
Means of inducting foam concentrate
Means of aerating foam solution
Means of projecting finished foam

Question 3

How foam extinguishes fires (5)

Answer 3

I INTERCEPTS radiant heat and prevents further evaporation of fuel
F FORMS a blanket and prevents vapour escaping
C COOLS the fuel although not a major factor in process
I ISOLATES the fuel
D DILUTES the surrounding air with water vapour that has evaporated

IFCID

Question 4

Methods of application (5)

Answer 4

Snow
Splash
Trunking
Throw
Flow

Question 5

Considerations (5)

Answer 5

Make sure finished foam is being produced before aiming at fire
Collate sufficient resources
Wind direction
Maximum 2 x 25m lay flat hose between generator and branch
Application rate must be mainted

Question 6

Expansion ratios (3)

Answer 6

Low expansions
Medium expansions
High expansion

Question 7

Low expansion

Answer 7

20:1
Most widely used
Can project a long distance
Spreadsheet quickly
Forms a stable and secure blanket

Question 8

Medium expansion

Answer 8

20:1 - 250:1
Used to deal with storage tanks, cable ducts transformer protections

Question 9

High expansion

Answer 9

Above 200:1
Used to deal with ship holds, basements, machinery spaces

Loss of senses, vision, direction, hearing
Alarms and evacuation signals difficult to hear
Heat transmissions is reduces
Possibility of pockets of trapped gas
Unable to observe damage to structures and obstructions