Foam

Question 1

What are the dangers of applying water to a liquid?

Answer 1

1. Turns the water to steam (1:1700)
2. It will sink to the bottom of the liquid
3. It will raise the level
4. The burning liquid can overspill
5. This will spread the fire

Question 2

What effects does foam have when applied correctly to a burning liquid?

Answer 2

1. Forms a blanket to exclude oxygen
2. Prevent more vapour escaping
3. Insulates the liquid which stops more vapour being generated
4. Produces some steam which dilutes the oxygen
5. Has a cooling effect

Question 3

What equipment is required to deliver aspirated foam?

Answer 3

1. Pump
2. Hose
3. Inline inductor
4. Branch

Question 4

What are the two types of foam?

Answer 4

1. Non aspirated foam
2. Aspirated foam

Question 5

What is the foam concentrate used by ECFRS?

Answer 5

AFFF
Aqueous Film Forming Foam

Question 6

What are the advantages of AFFF?

Answer 6

1. Speed
2. Economy
3. Safety
4. Compatibility
5. Storage life

Question 7

What are the disadvantages of AFFF?

Answer 7

1. Inferior back burn resistance
2. Fast drain down time
3. Environmental
4. Storage

Question 8

What is meant by Polymeric layer?

Answer 8

The water from the foam is initially drained on contact with the alcohol. This forms the polymeric layer.
This allows you to apply further layers of foam on top as it acts as a barrier between foam layers and alcohol

Question 9

What are the three foam making branches?

Answer 9

1. KERR KBL 100
2. Rosenbauer branch
3. Akron hose reel branch

Question 10

What are the two inline inductors used in ECFRS?

Answer 10

1. Galena/ Hoenig main inline inductor
2. Galena high pressure hose reel inductor

Question 11

What induction rates are available with the main inline inductor?

Answer 11

1. 3%
2. 6% (polar solvents)

Question 12

What induction rate is used with the hose reel inductor?

Answer 12

3%

Question 13

How do you operate the main line inductor?

Answer 13

1. Run out required number of hose lengths
2. Couple the inductor into the hose line
3. Place the pick up tube into foam barrel and set percentage gauge
4. Connect suitable branch
5. Set pump pressure to 7 bar

Question 14

When should the inductors be tested?

Answer 14

1. Quarterly
2. Using clean water

Question 15

If the main inline inductor is working correctly during testing, how much foam should be produced?

Answer 15

Approx 13lpm (at 3%)

Question 16

If the hose reel inductor is working correctly during testing, how much foam should be produced?

Answer 16

1.5 to 2.0 lpm

Question 17

What stations have bulk foam lorries?

Answer 17

1. Stansted
2. Malden
3. Orsett

Question 18

What are the three application methods of foam?

Answer 18

1. Snow
2. Cascade and roll
3. Indirect