Flashcards in Pump Ops Chpt 14 Deck (108)
Raw foam liquid in its storage container before being combined with water and air
Device that injects the correct amount of foam concentrate into the water stream to make the foam solution
Mixture of foam concentrate and water before the introduction of air
Completed product after air is introduced into the foam solution (also known as finished foam)
Class B fuels are divided into two categories ____ and _____.
Hydrocarbons and polar solvents
Creates a barrier between the fuel and fire
Lowers the temperature of the fuel and adjacent surfaces
Prevents the release of flammable vapors, reducing the possibility of ignition or reignition
Suppressing or smothering
_____ is the act of mixing of water with foam concentrate to form a foam solution
Most fire fighting foams are formulated to mix with _____ to _____ percent water
94 to 99.9
Class A foams are formulated to be proportioned within certain limits established by the manufacturer to achieve specific objectives. These percentages may range from a little as ___ to ___.
0.1 percent to 1.0 percent
The induction method of Proportioning foam uses the pressure of a water stream to induct foam concentrate into the fire stream. This is achieved by passing the stream of water through a Venturi device called an ______.
The ________method of Proportioning foam uses an external pump to force foam concentrate into the fire stream at the proper ratio in comparison to the flow.
A simple but potentially inaccurate method of mixing foam concentrate and water, ____ occurs when an appropriate amount of foam concentrate is poured directly into a tank of water.
Is a common method of Proportioning in which pre measured portions of water and foam concentrate are mixed in a container. Typically, this method is used with portable and wheeled extinguishers, skid mounted twin agent units, and apparatus mounted tank systems.
Five gallon plastic ___ are commonly used containers in many municipal fire departments.
Foam concentrate is also available in 55 gallon plastic or plastic lined _________.
When bulk storage of foam concentrates is required, some fire departments or industrial facilities may specify 275 gallon containers, called ____.
Foam concentrate tanks on municipal fire apparatus generally range from ___ to ___ gallons while foam pumper or tenders may carry ____ or more of concentrate.
20 to 200 gallons
Available since the 1940s, _____ technology has only recently been widely accepted mad used for increasing numbers of structures, wildland, coal, tire storage, and other fires involving deep seated fuels.
The formula of class A foam includes hydrocarbon _____ that reduce the surface tension of water in the foam solution.
The shelf life of properly stored foam solution can be as long as ____ years making it an economical choice to purchase in bulk quantities.
Class A foam concentrates may be mixed with percentages as little as ____ to ____.
0.1 to 1.0 percent
The ______ refers to the minimum amount of foam solution that must be applied to a fire, per minute, per square foot, of fire. The ______ rate for class A foam is the same as the minimum required flow rate of water.
Rate of application
Is applied to suppress fires involving flammable and combustible liquids. It is also used to suppress vapors from un ignited spills.
Class B foam
Class B Should be stored in cool areas to maximize shelf life: approximately___ for protein based foams and __ to ___ for synthetic foam.
20 to 25 years
The chemical properties of class B foam concentrates and their impact on the environment may vary depending on the product and manufacturer. Generally protein based products are considered safe for the environment. However, consult the _____ provided by the manufacturer for the specific safety information.
Safety data sheets (SDSs)
Class B foams are mixed from ___ to ____.
One to Six percent
The concentration for hydrocarbon fuels is normally ___ to ____, while ___ to ___ is used for polar solvents, based on the manufacturers recommendations.
1 to 3 percent
3 to 6 percent