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Engineers Test Exam 14 > TB 103 Foam Dispensing Equipment > Flashcards

TB 103 Foam Dispensing Equipment Flashcards

1
Q

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

A

200 series engines

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2
Q

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

A

engines, 200 series and 400 series engines

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3
Q

1” bubble cup spray tip is carried on

A

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

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4
Q

Class A foam reduces _______

A

the surface tension of water

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5
Q

Class A foam will increase the effectiveness of water by

A

3-5 times more

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6
Q

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

A

quick evaporation

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7
Q

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

A

blanket

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8
Q

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

A

80%

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9
Q

Hydro-Foam Nozzle is of the ______ type

A

Non-aspirating

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10
Q

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

A

3:1 to 6:1

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11
Q

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

A

75 psi or less

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12
Q

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

A

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

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13
Q

HF inlet pressure/ gpm/ stream range/ proportioned mixture

A

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

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14
Q

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

A

be utilized

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15
Q

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

A

no

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16
Q

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.

A

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

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17
Q

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.

A

efficiency venturi-type device

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18
Q

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.

A

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

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19
Q

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).

A

1,000 ft

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20
Q

Calculate the pressure to pump to the JRC:

A

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

Ladder pipe = 125 to start into JRC

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21
Q

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 _____.

A

will kink easily / supply hoses or other obstructions.

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22
Q

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

A

20 gallons

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23
Q

Two brands of In line foam eductors:

A

Williams Fire & Hazard Control and TFT

24
Q

WIlliams Fire and Hazard brand will allow foam mixtures ranging from

A

0.5% to 6%

25
Q

TFT will allow foam mixtures ranging from

A

0.25% to 6%

26
Q

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 ____

A

150’

27
Q

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 ___.

A

250’

28
Q

Operating the 1-1/2” In-Line Foam Eductor:

Pump ____ to the eductor inlet.

A

200 psi

29
Q

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).

A

35 psi / 25 psi

30
Q

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.

A

130 psi

31
Q

Williams’ Brand:

Select desired mixture. Use ___ for Class “B” flammable liquids/polar solvents. Use____ for Class “A” fuels.

A

3% / ½% or 1%

32
Q

Williams’ Brand:

It may ____ to change the percentage setting under pressure.

A

be impossible

33
Q

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.

A

FOAM position

34
Q

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 _____

A

“0” position

35
Q

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.

A

large increase in nozzle pressure. / 10%

36
Q

TFT Inline foam eductor:

Determine the desired mixture. Use ____ for Class “B” flammable liquids/polar solvents. Use _____ for Class “A” fuels.

A

3% / ¼%, ½% or 1%

37
Q

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.

A

from OFF to the desired setting

38
Q

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.

A

the OFF

39
Q

Cleaning the williams brand:

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

A

container of fresh water.

40
Q

Clean TFT eductor:

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

A

75 psi.

41
Q

Clean TFT eductor:

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

A

6% setting.

42
Q

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.

A

RED flush button

43
Q

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 ____.

A

back flush above 75 psi. /over 75 psi.

44
Q

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

A

Conventional / Aspirating

45
Q

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.

A

8:1

46
Q

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.

A

aeration / heat absorptive capability

47
Q

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.

A

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

48
Q

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

A

wet foam.

49
Q

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 _____.

A

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

50
Q

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

A

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

51
Q

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 _____>

A

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

52
Q

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

A

elastic force of a liquid

53
Q

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

A

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

54
Q

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 ______.

A

70 dynes per centimeter / 30 dynes.

55
Q

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

A

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

56
Q

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

A

released from the bubble structure of finished foam.

57
Q

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.

A

fluidity of foam /

Engineers Test Exam 14 (9 decks)

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