Foam

Question 0

How does foam suppress fires?

Answer 0

Smothers, penetrates, cools

Question 1

What is class A foams main purpose?

Answer 1

Lower the surface tension of water

Question 2

What concentration of class A foam is typically used?

Answer 2

.3-.5%.
At .3%, 1/3 of a gallon of concentrate is used per 100 gallons of water. 1 and 2/3 gallon of concentrate is used per 500 gallons of water. Thus, one 5 gallon bucket of foam will last through 3 tanks of water.

Question 3

Three typical class A foam applications

Answer 3

Direct, foam line, protective

Question 4

What is direct foam application?

Answer 4

Water is mixed with foam and applied through standard nozzle to penetrate into fuel

Question 5

What foam concentration settings are on the TFT class B foam eductor

Answer 5

.25 and .5%

Question 6

What does the foam flush do?

Answer 6

Flows water through the foam injection lines downstream of the foam pump.

Question 7

What must be done before flowing class B foam through your foam system?

Answer 7

Must flush the foam lines and foam manifold.

Question 8

What is the advantage of protein class B foams?

Answer 8

Bio-degrade able, flow and spread slower but provide a foam blanket that is more heat resistive and durable.

Question 9

What is the advantage of synthetic class B foam?

Answer 9

Better flow, faster knockdown

Question 10

What percentage of class B foam is used by SBCoFD

Answer 10

1%

Question 11

How many gallons of 1% class b foam concentrate are needed for 500 gallons

Answer 11

5 gallons. At 1% it takes 100 gallons of water per gallon of foam.

Question 12

How many sq. feet of area can a type one engine with 500 gallons water and 5 gallons of 1% class b foam cover?

Answer 12

300 sq feet, 17x17 ft square or 20 ft diameter circle

Question 13

Class B foam application methods

Answer 13

Rain down, roll on, bank down

Question 14

3 types of educators used in SBCoFD

Answer 14

Elkhart, angus, TFT

Question 15

3 types of nozzles used for class B foam application

Answer 15

Select a flow, la nozzle, medium expansion nozzle

Question 16

What nozzles are used for class a foam application

Answer 16

Mad dog, salty, bubble cup

Question 17

What type of nozzle should not be used for class b foam application

Answer 17

Automatic

Question 18

How do you calculate back pressure on a foam eductor

Answer 18

Add nozzle pressure, hose friction loss, and elevation pressure loss = back pressure on eductor

Question 19

At what back pressure will the foam educators not work?

Answer 19

130 psi unless the foam proportion is no more than 1%, than 140 psi is acceptable

Question 20

What is the maximum length of the hose lay during a class b foam evolution based on?

Answer 20

Back pressure on the eductor

Question 21

What is the pressure needed to flow the Elkhart foam nozzle?

Answer 21

200 psi

Question 22

What is the pressure needed to flow the angus foam eductor

Answer 22

150 psi

Question 23

What is the pressure needed to flow the TFT foam eductor

Answer 23

200 psi

Question 24

What do you set the gpm on the selecta flow nozzle to?

Answer 24

To match the gpm on the specific eductor

Question 25

What are the GPms on the foam educators

Answer 25

Angus and Elkhart = 95 gpm TFT = 125 gpm

Question 26

What kind of pump is the foam pump on KME

Answer 26

Positive displacement