TB 103 Foam Dispensing Equipment Flashcards Preview

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

Flashcards in TB 103 Foam Dispensing Equipment Deck (57)
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1

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

200 series engines

2

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

engines, 200 series and 400 series engines

3

1" bubble cup spray tip is carried on

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

4

Class A foam reduces _______

the surface tension of water

5

Class A foam will increase the effectiveness of water by

3-5 times more

6

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

quick evaporation

7

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

blanket

8

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

80%

9

Hydro-Foam Nozzle is of the ______ type

Non-aspirating

10

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

3:1 to 6:1

11

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

75 psi or less

12

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

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

13

HF inlet pressure/ gpm/ stream range/ proportioned mixture

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

14

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

be utilized

15

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

no

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.

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

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.

efficiency venturi-type device

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.

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

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).

1,000 ft

20

Calculate the pressure to pump to the JRC:

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

Ladder pipe = 125 to start into JRC

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 _____.

will kink easily / supply hoses or other obstructions.

22

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

20 gallons

23

Two brands of In line foam eductors:

Williams Fire & Hazard Control and TFT

24

WIlliams Fire and Hazard brand will allow foam mixtures ranging from

0.5% to 6%

25

TFT will allow foam mixtures ranging from

0.25% to 6%

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 ____

150’

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 ___.

250’

28

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

Pump ____ to the eductor inlet.

200 psi

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).

35 psi / 25 psi

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.

130 psi