4630 Firefighting Foam And Wetting Agents

Question 1

Three ingredients of foam

Answer 1

Foam Concentrate
Water
Air

Question 2

Foam mixing ratio for 500 gallon tank.

Answer 2

10.8 oz or 1.5 cups

Question 3

Foam mixing ratio for 1000 gallon tank.

Answer 3

24 ounces or 3 cups

Question 4

Definition of foam

Answer 4

A stable mass of small air filled bubbles with a lower density / specific gravity than oil, gasoline, alcohol or water.

Question 5

Class A uses

.5% - 1%

Answer 5

Clings to vertical surfaces

Question 6

.1% concentrate will be beset used for

Answer 6

Deep seated fires and penetrating needs

Question 7

.3% concentrate is best used for

Answer 7

Structural firefighting where some vertical cling might be needed

Question 8

.5% concentrate is best used for

Answer 8

Tire pile fires

Question 9

1.0% foam will be effective for

Answer 9

Exposure needs on structures and in extreme weather and fire conditions.

Question 10

How often should class A foam be reapplied?

Answer 10

Every 10 minutes

Question 11

What is a riparian area?

Answer 11

The interface between land and a river or stream. Foam shall not be used with in 100’ of riparian areas.

Question 12

What does 3% x 6% foam mean?

Answer 12

3% for hydro carbons

6% for polar solvents

Question 13

Max GPM for 3% hydrocarbon application

Answer 13

167 GPM

Any more GPM will dilute product to less than 3%

Question 14

Max GPM for 6% polar solvent application

Answer 14

83 GPM

Any more GPM will dilute product to less than 6%

Question 15

Why do polar solvents break down class B foam faster?

Answer 15

Polar solvents have an affinity for water, they will extract water from the finished foam by pulling h2o out of the bubble wall.

Question 16

Re-application of foam is dependent on these factors

Answer 16

Ambient temperature
Fuel temperature
Active fire
Integrity of foam
Should be applied every 10 minutes

Question 17

How should you apply class b foam?

Answer 17

Indirect or banking method

Question 18

What is AFFF?

Answer 18

Aqueous Film Forming Foam

Question 19

What is the policy number for

Firefighting Foam and wetting agents

Answer 19

4630

Question 20

Why are polymers added to class b foam?

Answer 20

Polymers give elasticity, mechanical strength, and water retention capability to foams generated from them. The concentrates also contain dissolved polyvalent metallic salts, which aid in bubble strengthening capability when exposed to heat.