TB 103 - Foam Dispensing Equipment Flashcards

1
Q

Class “A” Foam Properties:

A
  • reduces surface tension of water
  • increases effectiveness of water by 3-5x

-resists quick evaporation in hot environment

-provides short term fire barrier

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2
Q

Class “B” Foam Properties:

A
  • forms blanket over flammable liquids, sealing flammable vapors under foam
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3
Q

When applying class “B” foam, at least _____% of the stream flow should land on the flammable liquid within a well-defined, compact, elliptical area or footprint.

A

80%

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4
Q

The Hydro-Foam Nozzle uses class B foam that expands to the optimum foam range from 3:1 to ____.

A

6:1

This expansion range produces a foam stream that is able to withstand winds and thermal updrafts present during large scale flammable liquid fires.

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5
Q

The Hydro-Foam Nozzle Flows 660 GPM at 100 PSI Nozzle pressure.

What is the straight stream range?

What is the proportioned foam concentrate mixture?

A

180 ft reach

3% mixture

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6
Q

The foam concentrate inlet on the Hydro-Foam Nozzle includes an ____ ft reinforced clear plastic “pigtail” with 1-1/2” couplings.

A

8ft

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7
Q

What are the two set-ups to get foam to flow from the Hydro-Foam Nozzle?

A
  1. Hydro-Foam Nozzle by itself
  2. Hydro-Foam Nozzle used with Jet Ratio Controller
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8
Q

If operating the Hydro-Foam Nozzle BY ITSELF:

Remove the gasket from female swivel on the clear plastic “pigtail” hose. Place the ____% disc (brass/plastic type washer) into the female coupling. Place the hose gasket back into the female swivel coupling.

A

3%

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9
Q

Operating the Hydro-Foam Nozzle with the Jet Ratio Controller:

What is the max hose distance allowed from JRC discharge to Hydro-Foam Nozzle “pigtail”?

A

1,000 ft

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10
Q

Hydro-Foam Nozzle and Jet Ratio Controller

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

A

20 gallons

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11
Q

1-1/2” In-line Foam Eductor

What type of foam can you use?

A

Class “A” or Class “B”

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12
Q

1-1/2” In-line Foam Eductor

  1. When using 1-1/2” hose, the hose lay FROM THE EDUCTOR to the spray nozzle MUST be _____ft.
  2. When using 1-3/4” hose, the hose lay FROM THE EDUCTOR to the spray nozzle MUST be _____ft.
  3. Always use the _____ gpm spray nozzle for both 1-1/2” and 1-3/4” hose evolutions.
  4. Pump _____ psi to the eductor inlet.
A
  1. 150ft
  2. 250ft
  3. 125 GPM
  4. 200 PSI
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13
Q

1-1/2” In-line Foam Eductor- Selecting the Desired Mixture

  1. Use ____% for Class “B” flammable liquids/polar solvents.
  2. Use ___% or lower for Class “A” fuels.
A
  1. 3%
  2. 1%
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14
Q

Cleaning the 1-1/2” In-line Foam Eductor (TFT Brand)

Do not back flush above ____ psi. Rapid back flush discharge from the pick-up tube could cause INJURY.

A

75 psi

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15
Q

Pumping Foam Using the 1-1/2” In-line Foam Eductor (Williams’ Brand)

Moving the Water-Foam selector ring from the FOAM position to the water position without decreasing pump pressure ______ % will result in a LARGE INCREASE in NOZZLE PRESSURE.

A

10%

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16
Q

1” Bubble Cup Spray Tip

To use the aspirating feature slide the gray sleeve portion of the spray tip FORWARD. When the sleeve is in the fully extended position, a _____ on the shaper will be visible at the base of the gray sleeve.

A

white line

17
Q
  1. 1” Bubble Cup Spray Tip produces a foam expansion ratio of _____.
  2. What “Class” foam is used in conjunction with the Bubble Cup?
A
  1. 8:1
  2. Class “A”
18
Q

Class “A” Foam Thru Bubble Cup

  1. Tests have demonstrated that air bubbles burst when exposed to temperatures in the range of _____ degrees Fahrenheit.
  2. Foam blankets break down _____ to _____ minutes following application.
A
  1. 170
  2. 15-to-30 mins
19
Q

Bubble Cup Spray Tip Foam application rates for Class A foam:

A
20
Q

Foam Performance

___________ is the elastic force of a liquid which tends to MINIMIZE the SURFACE AREA thus causing droplets to form.

A

-Surface Tension

(The high surface tension of water is a hindrance in firefighting.)
• Water inherently has “high surface tension” characteristics that hinder its ability to soak and penetrate into deep-seated Class “A” combustibles.
• Typical surface tension of water (measured in dynes) is about 70 dynes per centimeter. When just 0.1% of Class “A” foam (surfactant) is added, it will reduce the tension to as little as 30 dynes.

21
Q

Foam Performance

________ is the ratio of the volume of finished foam to the original volume of nonaspirated solution. The Quantity of bubbles.

A

Expansion Ratio

22
Q

Foam Performance

_________ is the rate at which the foam solution is RELEASED from the bubble structure of finished foam. The QUALITY of BUBBLES.

A

Drain Time

23
Q

Foam Performance

__________ is the FLUIDITY of foam. An indication of foam’s ability to cling and stick to a surface.

A

Finished Foam VISCOSITY

(This attribute is important in pretreatment and exposure protection.)