Ch15 Foam Equipment and Systems

Question 1

blank must be proportioned and aeroated before they can be used

Answer 1

mechanical foams

Question 2

Class B foams are divided into two categories?

Answer 2

polar solvents and hydrocarbons

Question 3

In general, foam works by forming a blank on the burning fuel

Answer 3

blanket

Question 4

the mixing of water with foam concentrate to form a foam solution

Answer 4

proportioning

Question 5

the blank method of proportioning foam uses the pressure energy in the stream of water to induct foam concentrate into the fire stream

Answer 5

induction

Question 6

the blank method of proportioning foam uses an external pump or head pressure to force foam concentrate into the fire stream at the correct ratio in comparison to the flow

Answer 6

injection

Question 7

Blank is commonly practiced with Class A foams but should only be used as a last resort with Class B foams

Answer 7

Batch Mixing

Question 8

Blank are perhaps the most common containers used by the municipal fire service

Answer 8

Five-gallon plastic pails

Question 9

Foam concentrate tanks on municipal pumpers range from blank to blank gallons

Answer 9

20 - 200

Question 10

Class A Foam is the formulation of blank surfactants that reduce the surface tension of the water in the foam solution

Answer 10

hydrocarbon

Question 11

Class A Foam may be used with which type of nozzles?

Answer 11

fog nozzles; aerating foam nozzles;medium-and high expansion devices; and compressed air foam systems using almost any nozzle

Question 12

AFFF and FFFP can be applied with?

Answer 12

standard fog nozzles

Question 13

What types of class B foams can air aspirating nozzles be used with

Answer 13

all types

Question 14

the increase in volume of a foam solution when it is aereated

Answer 14

foam expansion

Question 15

blank foam provides a strong “security blanket” for long-term vapor suppression that is especially critical with unignited spills

Answer 15

fluoroprotein foam

Question 16

this blank incorporates the benefits of AFFF for fast fire knockdown and the benefits of fluororprotein foam for long-lasting heat resistance

Answer 16

FFFP

Question 17

the most commonly used foam today

Answer 17

AFFF

Question 18

Rule 1 of eductors

Answer 18

The flow through the eductor should not exceed the rated capacity of the eductor

Question 19

Rule 2 of eductors

Answer 19

The pressure at the outlet of the eductor must not exceed 65 to 70 percent of the eductor inlet pressure

Question 20

Rule 3 of eductors

Answer 20

Foam solution concentration is only correct at the rated inlet pressure of the eductor, usually 150 - 200 psi

Question 21

Rule 4 of eductors

Answer 21

Eductors must be properly maintained and flushed after each use

Question 22

Rule 5 of eductors

Answer 22

metering valves must be set to match the foam concentrate percentage and the burning fuel

Question 23

Rule 6 of eductors

Answer 23

The foam concentrate inlet to the eductor should not be more than 6 feet above the liquid surface of the foam concentrate

Question 24

installed in-line eductors are most commonly used to proportion blank foams

Answer 24

class b

Question 25

The blank proportioning system consists of a small return water line connected from the discharge side of the pump back to the intake side of the pump

Answer 25

around-the-pump proportioner

Question 26

A major disadvantage of older around the pump proportioners?

Answer 26

the pump cannot take advantage of incoming pressure

Question 27

The primary advantages of the blank proportioner are its ability to monitor the demand for foam concentrate and to adjust the amount of concentrate supplied

Answer 27

Bypass-type balanced pressure proportioner

Question 28

a limitation of the bypass type balanced pressure proportioner is?

Answer 28

its need for a foam pump with PTO or other power source

Question 29

The foam concentrate injection is controlled by monitoring the water flow and controlling the speed of a positive displacement pump

Answer 29

variable flow variable rate direct injection systems

Question 30

in this system, a variable speed mechanism, which is either hydraulically or electrically controlled, drives a foam concentrate pump

Answer 30

variable flow demand type balanced pressure proportioner

Question 31

In general batch mixing is only used with blank and blank

Answer 31

regular AFFF and class A concentrates

Question 32

high energy foam systems differ from those previously discussed in that they introduce compressed air into the foam solution blank to discharge into the hoseline

Answer 32

prior

Question 33

most structural and wildland fire attacks using CAFS are done with an airflow rate of blank to blank cfm per gallon of foam solution

Answer 33

.5, 1

Question 34

With low energy foam systems, the aeration and discharge of the foam are accomplished by the blank, sometimes referred to as the foam maker

Answer 34

foam nozzle

Question 35

any nozzle that one to three firefighters can safely handle and that flows less than 350 gpm

Answer 35

handline nozzle

Question 36

Fog Nozzles best application is when used with blank and blank

Answer 36

regular AFFF, Class A Foams

Question 37

The only type of nozzle that can be used with flouroprotein and protein concentrates

Answer 37

Air aspirating nozzle