Chapter 14

Question 1

Hydrocarbons are most effectively put out using what type of foam?

Answer 1

Class b

Question 2

Polar solvents fuels are best extinguished using what type of foam?

Answer 2

Special alcohol resistant formulations of firefighting foam

Question 3

Foam is proportioned in what 4 basic methods?

Answer 3

Induction, injection, batch mixing, and premixing

Question 4

Batch mixing is most commonly used with what type of foam?

Answer 4

Class A foam

Question 5

When batch mixing class B foam concentrates what must be done?

Answer 5

Tank water must be circulated to ensure proper mixing before discharge

Question 6

What should be throughly flushed after using foams?

Answer 6

Fire pump associated piping, as well as tanks, hose, and appliances

Question 7

Premix systems are limited to one time use applications. Once used they must be?

Answer 7

Completely emptied, flushed, and refilled before they can be used again

Question 8

How is foam stored?

Answer 8

Pails, barrels, totes, and apparatus tanks

Question 9

Mixing different types or brands of foam concentrate should be?

Answer 9

Avoided as the result may prove ineffective for application and have reduced suppression capabilities

Question 10

The shelf life of properly stored foam can be as long as?

Answer 10

20 years

Question 11

What percent foam concentration should be used for the following?

Answer 11

Fire attack and overhaul with standard fog nozzle 0.2-0.5
Exposure protection with standard fog nozzle 0.5-1.0
Any application with air aspirating nozzles 0.3-0.7
Any application with compressed air foam system 0.2-0.5

Question 12

Class b foam has a shelf life of ?

Answer 12

10 years for protein based, 20-25 for synthetic

Question 13

What are the 3 foam expansion categories?

Answer 13

Low- 20:1
Medium 20:1-200:1
High 200:1- 1000:1

Question 14

Once you bring foam application you should?

Answer 14

Continue without interruption from an uphill and upwind position until extinguishment is complete

Question 15

What are the three common types of portable foam proportioners?

Answer 15

In-line foam eductors, foam nozzle eductors, and self educting master streams

Question 16

What should be done to properly maintain foam eductors after each use?

Answer 16

Use a bucket of water to immerse the foam pickup tube, letting it induct for at least one minute

Question 17

The foam eductor inlet should be no more than how many feet above the liquid surface of the foam concentrate?

Answer 17

No more than 6 feet above the liquid surface of the foam concentrate

Question 18

What will happen if the nozzle and eductor don’t have the same gpm rating?

Answer 18

If the nozzle flows at a higher rate, too much concentrate will be used depleting resources and creating a foam blanket that is “richer” than necessary. If the nozzle flows at a lower rate not enough concentrate will be used resulting in poor quality foam

Question 19

What is a major advantage of the self educting nozzle?

Answer 19

The pressure drop is much lower (10 percent or less) than most standard foam nozzle eductors

Question 20

When using a JRC (jet ratio controller) foam concentrate can be located as far as how many feet from the self educting master stream nozzle, and up to how much feet of elevation change?

Answer 20

As far as 3000 ft away from the self educting master stream nozzle, and up to 50 ft of elevation change

Question 21

Installed in line eductors are most commonly used to proportion what type of foam?

Answer 21

Class B, installed in line eductors are usually not effective for the very low concentrations used in class A foam operations

Question 22

What is good to know about your apparatus if it has an around the pump proportioner?

Answer 22

If it can only be operated when the apparatus is operating from the onboard water tank, because inlet water pressure greater than 10 psi will not allow foam concentrate to enter the pump intake in some older models.

Question 23

True or false. Can around the pump proportioners flow both foam and plain water from the pump at the same time?

Answer 23

False, it cannot flow both at the same time

Question 24

What is one of the most common types of foam proportioning systems?

Answer 24

Bypass-type balanced pressure proportioners

Question 25

True or false. The bypass type balanced pressure proportioner has the ability to allow foam discharge from some outlets and plain water from others simultaneously?

Answer 25

True, it can do both simultaneously

Question 26

What type of foam is not useable with a variable flow variable rate direct injection systems?

Answer 26

Alcohol resistant foam concentrates due to the viscous (thick) nature of the product.

Question 27

True or false. The variable-flow variable-rate direct injection system are able to adjust to changes in water flow as nozzles are opened or shut, and nozzles can be operated either above or below the pump without adversely affecting foam proportioning?

Answer 27

True it can adjust to open or closing of nozzles, and is not affecting by nozzles above or below the pump

Question 28

What type of proportioner system is maintained in a ready to pump condition that requires no flushing after use?

Answer 28

Variable-flow demand-type balanced pressure proportioners

Question 29

True or false. Water and/or foam solution may be discharged simultaneously from any number of outlets, up to the rated capacity of the pump in a variable-flow demand-type balanced pressure proportioner?

Answer 29

True

Question 30

What is referred to as the simplest method of proportioning foam?

Answer 30

Batch mixing

Question 31

What should the driver operator make sure to do after batch mixing foam?

Answer 31

Throughly flush out the tank, and pump to remove all foam. And check the seals for proper lubrication

Question 32

Fog nozzles are not a suitable choice for sufficient aspiration of what type of foam?

Answer 32

They are not an acceptable choice for delivery of Fluoroprotein foams as insufficient aspiration is created

Question 33

What type of nozzle is the only nozzles that should be used with protein and fluoroprotein concentrates?

Answer 33

Air-aspirating foam nozzles

Question 34

What are the 4 types of foam application?

Answer 34

Direct application, roll-on method, bank-down method, rain-down method