TB 103 Foam Dispensing Equipment Flashcards
Hydro-foam nozzle and Jet Ratio Controller are carried on all
200 series engines
1 1/2” in line foam eductor is carried on all
engines, 200 series and 400 series engines
1” bubble cup spray tip is carried on
all engines, 200 & 400 series engines and brush patrols with Class A foam capability
Class A foam reduces _______
the surface tension of water
Class A foam will increase the effectiveness of water by
3-5 times more
Class A foam extends the useful life of water as it resists ______ in a hot environment
quick evaporation
Class B foam forms a _____ over flammable liquids, sealing flammable vapors under the foam
blanket
At least _____ of Class B foam should land on the flammable liquid within a well-defined, compact, ellipitical area or footprint
80%
Hydro-Foam Nozzle is of the ______ type
Non-aspirating
HF nozzle produces a high-quality foam that expands to the optimum Class B foam range from ___
3:1 to 6:1
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
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).
HF inlet pressure/ gpm/ stream range/ proportioned mixture
100 psi/ 660 GPM/ 180’ straight stream range/ 3% mixture
HF can _______ as a master stream in situations not calling for application of class B foam
be utilized
Does the 1 1/2 foam inlet need to be cap if not in use?
no
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
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
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)
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
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
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.
Expect to use ____ of concentrate per minute of operation while water is flowing.
20 gallons
Two brands of In line foam eductors:
Williams Fire & Hazard Control and TFT
WIlliams Fire and Hazard brand will allow foam mixtures ranging from
0.5% to 6%
TFT will allow foam mixtures ranging from
0.25% to 6%
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’
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’
Operating the 1-1/2” In-Line Foam Eductor:
Pump ____ to the eductor inlet.
200 psi
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
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
Williams’ Brand:
Select desired mixture. Use ___ for Class “B” flammable liquids/polar solvents. Use____ for Class “A” fuels.
3% / ½% or 1%
Williams’ Brand:
It may ____ to change the percentage setting under pressure.
be impossible
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.
FOAM position
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 _____
“0” position
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.
large increase in nozzle pressure. / 10%
TFT Inline foam eductor:
Determine the desired mixture. Use ____ for Class “B” flammable liquids/polar solvents. Use _____ for Class “A” fuels.
3% / ¼%, ½% or 1%
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.
from OFF to the desired setting
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.
the OFF
Cleaning the williams brand:
After use, take the pick-up tube out of the foam concentrate container and place in a ____.
container of fresh water.
Clean TFT eductor:
After use, take the pick-up tube out of the foam concentrate container and reduce pump pressure below _____.
75 psi.
Clean TFT eductor:
Firmly hold on to the pick-up tube and expect a rapid discharge of water especially at the ____.
6% setting.
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.
RED flush button
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 ____.
back flush above 75 psi. /over 75 psi.
1” Bubble Cup Spray Tip Model D1040BC si both a _____ and ______ type nozzle
Conventional / Aspirating
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.
8:1
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.
aeration / heat absorptive capability
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.
vertical surfaces / 170 degrees Fahrenheit. / 15-to-30 minutes
An application rate of 0.1% up to 0.3% will provide a ____.
wet foam.
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 _____.
dry fuels, on deep-seated fires and mop up.
An application rate of ______ will provide a much dryer foam. This is used for direct initial attack on ______.
0.3% up to 0.6% / fine fuels, deep-seated fires and mop up.
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 _____>
0.6% up to 1% / shaving cream consistency and medium-to-small bubble structure. /30 minutes.
Surface Tension is the ____ which tends to minimize the surface area thus causing droplets to form.
elastic force of a liquid
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 _____. When just 0.1% of Class “A” foam (surfactant) is added, it will reduce the tension to as little as ______.
70 dynes per centimeter / 30 dynes.
Expansion Ratio is the ratio of the______. The Quantity of bubbles.
volume of finished foam to the original volume of non-aspirated solution
Drain Time is the rate at which the foam solution is ___.
released from the bubble structure of finished foam.
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.
fluidity of foam /
