Chapter 14: Foam Equipment and Systems Flashcards
_________ are the most common foams in use. They must be proportioned and aerated before use.
Mechanical foams
__________: mixing of water with an appropriate amount of foam concentrate in order to form a foam solution
Proportioning
__________: introducing air into a foam solution to create bubbles that result in finished foam
Aeration
_________: The process used to mix foam concentrate with water in the nozzle or proportioner; concentrate is drawn into the water system by the Venturi method
Eduction
_________: (1) Raw chemical compound solution that is mixed with water and air to produce finished foam; may be a protein, synthetic, aqueous film forming, hight expansion or alcohol types. (2) Raw foam liquid as it rests in storage container before the introduction of water and air.
Foam concentrate
__________: A device that injects the correct amount of foam concentrate into the water stream to make the foam solution.
Foam proportioner
_________: (1) The result of mixing the appropriate amount of foam concentrate with water. (2) The mixture of foam concentrate and water before the introduction of air
Foam solution
Class B fuels are divided into two categories:
Hydrocarbons
Polar solvents
________: A petroleum based organic compound that contains only hydrogen and carbon
Hydrocarbon fuel
________: liquid having a molecule where the positive and negative charges are permanently separated, resulting in their ability to ionize in solution and create electrical conductivity.
Polar solvents
_________: Materials that are capable of being mixed in all proportion.
Miscible
Foam works in three ways:
Separating
Cooling
Suppressing/Smothering
Most firefighting foam concentrate or formulated to mix with ________ % water.
94-99.9
Foam is proportioned using one of four basic methods:
Induction
Injection
Batch mixing
Premixing
_________: production of foam solution by adding an appropriate amount of foam concentrate to a water tank before application; the resulting solution must be used or discarded following the incident.
Batch mixing
_________: mixing premeasured portions of water and foam concentrates in a container. Typically, this method is used with portable extinguishers, skid-mounted twin agent units, and vehicle-mounted tank systems.
Premixing
Foam can be stored by using: (4)
Pails (5 gallons)
Barrels (55 gallons)
Totes (275 gallons)
Apparatus Tanks
(fire apparatus:20-200 gallons)
(pumper/tenders: 8,000 gallons)
This type of foam concentrate is a hydrocarbon-based surfactant (essentially wetting agents) that reduce the surface tension of water and allow it to soak into combustible materials more easily than plain water.
Class A foam concentrate
______: A chemical that lowers the surface tension of a liquid; allowing water to spread more rapidly over the surface of class A fuels end penetrate organic fuels.
Surfactant
Direct skin contact should be avoided as class A concentrate as a _________ characteristic.
Corrosive
This type of foam concentrate is applied to suppress fires involving flammable and combustible liquids. These from concentrates consist of a synthetic or protein-based foam
Class B foam concentrate
__________: form provided by the manufacturer and blender of chemicals that contains information about chemical composition, physical and chemical properties, health and safety hazards, emergency response procedures, and waste disposal procedures of a specific material.
Safety Data Sheets (SDS)
__________: result of adding air to a foam solution concentrate. Creates the foam bubbles that result in finished foam or foam blanket.
Foam expansion
_________: to cause or undergo a chemical process of decomposition involving the splitting of a bond and the addition of the element of water.
Hydrolyze
___________: The ability of a foam blanket to resist direct flame impingement such as would be evident in a partially extinguish petroleum fire.
Burnback resistance
A handheld nozzle is any nozzle that can be safely handled by _______ firefighters and flows less than ______ GPM
1-3
350
Name the four foam application techniques.
Direct application
Roll-on method
Bank-down method
Rain-down method
_________: capable of being broken down into innocuous products by the action of living things such as micro organisms.
Biodegradable
_________: Chemical change in which a substance breaks down into two or more simpler substances. Results of oxygen acting on a material that results in a change in the material’s composition; oxidation occurs slowly’s, sometimes resulting in the rusting of materials.
Decomposition
__________: super absorbent liquid polymers capable of absorbing hundreds of times their own weight in water. These can be used as fire suppressant’s and fire retardant’s. They function by entrapping water in their structure rather than air.
Gelling agents
_________: foam produced by a physical agitation of a mixture of foam concentrate, water and air
Mechanical foam
