TB 103 Foam Dispensing Equipment

Question 1

Hydro-foam nozzle and Jet Ratio Controller are carried on all

Answer 1

200 series engines

Question 2

1 1/2” in line foam eductor is carried on all

Answer 2

engines, 200 series and 400 series engines

Question 3

1” bubble cup spray tip is carried on

Answer 3

all engines, 200 & 400 series engines and brush patrols with Class A foam capability

Question 4

Class A foam reduces _______

Answer 4

the surface tension of water

Question 5

Class A foam will increase the effectiveness of water by

Answer 5

3-5 times more

Question 6

Class A foam extends the useful life of water as it resists ______ in a hot environment

Answer 6

quick evaporation

Question 7

Class B foam forms a _____ over flammable liquids, sealing flammable vapors under the foam

Answer 7

blanket

Question 8

At least _____ of Class B foam should land on the flammable liquid within a well-defined, compact, ellipitical area or footprint

Answer 8

80%

Question 9

Hydro-Foam Nozzle is of the ______ type

Answer 9

Non-aspirating

Question 10

HF nozzle produces a high-quality foam that expands to the optimum Class B foam range from ___

Answer 10

3:1 to 6:1

Question 11

Hydro-Foam Nozzles can operate effectively at low nozzle pressures (_______) because less energy is needed to proportion the foam concentrate with water.

Answer 11

75 psi or less

Question 12

Large quantities of foam concentrate can be located remote from the nozzle and transported to the nozzle using _____

Answer 12

small diameter hose lines (1-1/2” utilizing a special venture-type device (Jet Ratio Controller or JRC).

Question 13

HF inlet pressure/ gpm/ stream range/ proportioned mixture

Answer 13

100 psi/ 660 GPM/ 180’ straight stream range/ 3% mixture

Question 14

HF can _______ as a master stream in situations not calling for application of class B foam

Answer 14

be utilized

Question 15

Does the 1 1/2 foam inlet need to be cap if not in use?

Answer 15

no

Question 16

The foam concentrate inlet on the Hydro-Foam Nozzle includes an______. This configuration allows foam concentrate to be delivered efficiently to the nozzle via standard 1-1/2” fire hose.

Answer 16

8’ reinforced clear plastic “pigtail” with 1-1/2” NH swivel inlet for connection to the fire hose and a 1-1/2 NH swivel connection to the nozzle

Question 17

The JRC utilizes a small amount of water, passing through a high _____, to move foam concentrate from a remote storage location to a “matched” Hydro-Foam Nozzle.

Answer 17

efficiency venturi-type device

Question 18

To pump foam using the Hydro-Foam Nozzle by itself:

Remove the gasket from female swivel on the clear plastic “pigtail” hose. ________ into the female coupling. Place the hose gasket back into the female swivel coupling.

Answer 18

Place the 3% disc (brass/plastic type washer)

Question 19

Operating the Hydro-Foam Nozzle and Jet Ratio Controller:
Connect sufficient 1-1/2” hose to reach from the JRC discharge to reach the Hydro-Foam Nozzle “pigtail” (______ maximum).

Answer 19

1,000 ft

Question 20

Calculate the pressure to pump to the JRC:

Answer 20

50 psi constant / 35 psi per 100 of 1 1/2” and 40 psi for ladder pipe

Ladder pipe = 125 to start into JRC

Question 21

Due to low PSI, the 1-1/2” foam discharge solution line running from the discharge side of the JRC to the inlet
of the Hydro-Foam Nozzle_____. Do not run the 1-1/2” line under _____.

Answer 21

will kink easily / supply hoses or other obstructions.

Question 22

Expect to use ____ of concentrate per minute of operation while water is flowing.

Answer 22

20 gallons

Question 23

Two brands of In line foam eductors:

Answer 23

Williams Fire & Hazard Control and TFT

Question 24

WIlliams Fire and Hazard brand will allow foam mixtures ranging from

Answer 24

0.5% to 6%

Question 25

TFT will allow foam mixtures ranging from

Answer 25

0.25% to 6%

Question 26

Operating the 1-1/2” In-Line Foam Eductor: When using 1-1/2” hose, the hose lay from the eductor to the spray nozzle MUST be ____

Answer 26

150’

Question 27

Operating the 1-1/2” In-Line Foam Eductor: When using 1-3/4” hose, the hose lay from the eductor to the spray nozzle MUST be ___.

Answer 27

250’

Question 28

Operating the 1-1/2” In-Line Foam Eductor: Pump ____ to the eductor inlet.

Answer 28

200 psi

Question 29

Operating the 1-1/2” In-Line Foam Eductor: When 1-1/2” or 1-3/4” hose is utilized to move the in-line educator away from the apparatus and closer to the objective, pump 200 psi plus the required friction loss (______ per 100’ of 1-1/2” hose or _____ per 100’ of 1-3/4” hose).

Answer 29

35 psi / 25 psi

Question 30

Operating the 1-1/2” In-Line Foam Eductor: he inlet pressure is reduced as it passes through the venturi inside the eductor. This pressure is reduced to a discharge pressure of ____ at the discharge outlet.

Answer 30

130 psi

Question 31

Williams’ Brand: | Select desired mixture. Use ___ for Class “B” flammable liquids/polar solvents. Use____ for Class “A” fuels.

Answer 31

3% / ½% or 1%

Question 32

Williams’ Brand: | It may ____ to change the percentage setting under pressure.

Answer 32

be impossible

Question 33

Williams Brand: With the hose line charged, rotate the Water-Foam selector ring to the____ . As air is entrained in the solution, nozzle pressure and nozzle reaction will drop.

Answer 33

FOAM position

Question 34

Williams Brand: You can stop the flow of foam by removing the pick-up tube from the foam concentrate container or by rotating the percentage selector knob to the _____

Answer 34

“0” position

Question 35

Williams Brand Caution: Moving the Water-Foam selector ring from the FOAM position to the water position without decreasing pump pressure will result in a _____. Increased nozzle reaction will occur. Reduce pump pressure _____ before changing from FOAM to WATER.

Answer 35

large increase in nozzle pressure. / 10%

Question 36

TFT Inline foam eductor: | Determine the desired mixture. Use ____ for Class “B” flammable liquids/polar solvents. Use _____ for Class “A” fuels.

Answer 36

3% / ¼%, ½% or 1%

Question 37

TFT Inline foam eductor: With the hose line charged, rotate the Meter Head _____ (i.e., 3%). Line the percentage setting with the proportioning indicator located on the pick-up tube housing.

Answer 37

from OFF to the desired setting

Question 38

TFT Inline foam eductor: You can stop the flow of foam by removing the pick-up tube from the foam concentrate container or by rotating the percentage selector knob to ____ position.

Answer 38

the OFF

Question 39

Cleaning the williams brand: | After use, take the pick-up tube out of the foam concentrate container and place in a ____.

Answer 39

container of fresh water.

Question 40

Clean TFT eductor: | After use, take the pick-up tube out of the foam concentrate container and reduce pump pressure below _____.

Answer 40

75 psi.

Question 41

Clean TFT eductor: | Firmly hold on to the pick-up tube and expect a rapid discharge of water especially at the ____.

Answer 41

6% setting.

Question 42

Clean TFT eductor: Push the _____ and run fresh water through the pick-up tube and metering head on each setting until there is no visible foam in the flush water.

Answer 42

RED flush button

Question 43

Clean TFT eductor: Do not _____. Rapid back flush discharge from the pick-up tube could cause injury. The back flush push button is pressure activated and must not be forced at pressures ____.

Answer 43

back flush above 75 psi. /over 75 psi.

Question 44

1" Bubble Cup Spray Tip Model D1040BC si both a _____ and ______ type nozzle

Answer 44

Conventional / Aspirating

Question 45

The Bubble Cup spray tip is capable of producing aspirated foam, with an expansion ratio of____ as well as conventional straight stream and wide protective fog pattern.

Answer 45

8:1

Question 46

Foaming agents (such as Class “A” foam) are mixed with air and water to produce air bubbles in a process known as_____ . An aerated foam solution increases the surface area of the liquid thereby increasing the _____ of the foam solution.

Answer 46

aeration / heat absorptive capability

Question 47

The increased surface area also improves the mixture’s ability to cling to _____. Tests have demonstrated that air bubbles burst when exposed to temperatures in the range of_______. Foam blankets break down _______ following application.

Answer 47

vertical surfaces / 170 degrees Fahrenheit. / 15-to-30 minutes

Question 48

An application rate of 0.1% up to 0.3% will provide a ____.

Answer 48

wet foam.

Question 49

A wet foam is a watery foam that is runny on vertical surfaces, fast draining, and has a great variation in bubble size. This is used for immediate penetration into _____.

Answer 49

dry fuels, on deep-seated fires and mop up.

Question 50

An application rate of ______ will provide a much dryer foam. This is used for direct initial attack on ______.

Answer 50

0.3% up to 0.6% / fine fuels, deep-seated fires and mop up.

Question 51

An application rate of____ will offer only minimally more foam quantity, but will provide more surfactant in the bubble shell for a longer lasting foam blanket. This type of foam application will provide ________. It clings readily to vertical surfaces, makes foam barriers for exposures (similar to Thermo Gel application) and wet lines that will hold over _____>

Answer 51

0.6% up to 1% / shaving cream consistency and medium-to-small bubble structure. /30 minutes.

Question 52

Surface Tension is the ____ which tends to minimize the surface area thus causing droplets to form.

Answer 52

elastic force of a liquid

Question 53

Water inherently has “high surface tension” characteristics that hinder its ability to ______

Answer 53

soak and penetrate into deep-seated Class “A” combustibles.

Question 54

Typical surface tension of water (measured in dynes) is about _____. When just 0.1% of Class “A” foam (surfactant) is added, it will reduce the tension to as little as ______.

Answer 54

70 dynes per centimeter / 30 dynes.

Question 55

Expansion Ratio is the ratio of the______. The Quantity of bubbles.

Answer 55

volume of finished foam to the original volume of non-aspirated solution

Question 56

Drain Time is the rate at which the foam solution is ___.

Answer 56

released from the bubble structure of finished foam.

Question 57

Finished Foam Viscosity is the ____. An indication of foam’s ability to cling and stick to a surface. This attribute is important in pretreatment and exposure protection.

Answer 57

fluidity of foam /