TB 103 - Foam Dispensing Equipment

Question 1

Class “A” Foam Properties:

Answer 1

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

-resists quick evaporation in hot environment

-provides short term fire barrier

Question 2

Class “B” Foam Properties:

Answer 2

• forms blanket over flammable liquids, sealing flammable vapors under foam

Question 3

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.

Answer 3

80%

Question 4

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

Answer 4

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.

Question 5

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?

Answer 5

180 ft reach

3% mixture

Question 6

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

Answer 6

8ft

Question 7

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

Answer 7

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

Question 8

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.

Answer 8

3%

Question 9

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”?

Answer 9

1,000 ft

Question 10

Hydro-Foam Nozzle and Jet Ratio Controller

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

Answer 10

20 gallons

Question 11

1-1/2” In-line Foam Eductor

What type of foam can you use?

Answer 11

Class “A” or Class “B”

Question 12

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.

Answer 12

1. 150ft
2. 250ft
3. 125 GPM
4. 200 PSI

Question 13

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.

Answer 13

1. 3%
2. 1%

Question 14

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.

Answer 14

75 psi

Question 15

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.

Answer 15

10%

Question 16

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.

Answer 16

white line

Question 17

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

Answer 17

1. 8:1
2. Class “A”

Question 18

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.

Answer 18

1. 170
2. 15-to-30 mins

Question 19

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

Answer 19

Question 20

Foam Performance

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

Answer 20

-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.

Question 21

Foam Performance

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

Answer 21

Expansion Ratio

Question 22

Foam Performance

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

Answer 22

Drain Time

Question 23

Foam Performance

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

Answer 23

Finished Foam VISCOSITY

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