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Flashcards in Foam Deck (27):
0

What is class A foams main purpose?

Lower the surface tension of water

1

How does foam suppress fires?

Smothers, penetrates, cools

2

What concentration of class A foam is typically used?

.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.

3

Three typical class A foam applications

Direct, foam line, protective

4

What is direct foam application?

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

5

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

.25 and .5%

6

What does the foam flush do?

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

7

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

Must flush the foam lines and foam manifold.

8

What is the advantage of protein class B foams?

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

9

What is the advantage of synthetic class B foam?

Better flow, faster knockdown

10

What percentage of class B foam is used by SBCoFD

1%

11

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

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

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?

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

13

Class B foam application methods

Rain down, roll on, bank down

14

3 types of educators used in SBCoFD

Elkhart, angus, TFT

15

3 types of nozzles used for class B foam application

Select a flow, la nozzle, medium expansion nozzle

16

What nozzles are used for class a foam application

Mad dog, salty, bubble cup

17

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

Automatic

18

How do you calculate back pressure on a foam eductor

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

19

At what back pressure will the foam educators not work?

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

20

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

Back pressure on the eductor

21

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

200 psi

22

What is the pressure needed to flow the angus foam eductor

150 psi

23

What is the pressure needed to flow the TFT foam eductor

200 psi

24

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

To match the gpm on the specific eductor

25

What are the GPms on the foam educators

Angus and Elkhart = 95 gpm TFT = 125 gpm

26

What kind of pump is the foam pump on KME

Positive displacement