Chapter 14 Flashcards
Foam produced by a physical agitation of a mixture of foam, concentrate, water, and Air is called?
Mechanical Foam
The process used to mix foam concentrate with water in a nozzle or proportioner concentrate is drawn into the water stream by the venturi method?
Eduction
Class b fuels are divided into two categories what are they?
Hydrocarbons and polar solvents
Crude oil fuel oil gasoline benzene and kerosene are petroleum based and have a specific gravity less than one what are these called?
Hydrocarbon fuels
Alcohol acetone ketones esters are known as miscible liquids because they mix with water what are these called?
Polar solvent fuels
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 and solution and create electrical conductivity. Water, alcohol, and sulfuric acid are examples of?
Polar solvents
Foam is proportioned using one of the four basic methods?
Induction
Injection
Batch mixing
Premixing
Chemical that lowers the surface tension of a liquid allows water to spread more rapidly over the surface of class A fuels and penetrate organic fuels?
Surfactant
Minimum amount of foam solution that must be applied to an unignited fire,spill, or spill fire to either control vapor emission or extinguish the fire, measured per minute per square foot or square meter of area to be covered?
Application Rate
Any application with compressed air foam systems?
0.2 to 0.5 percent concentrate
Any application with air aspirating foam nozzles?
0.3 to 0.7 percent
Exposure protection with standard fog nozzles?
0.5 to 1.0 percent concentrate
Fire attack and overhaul with standard fog nozzles?
0.2 to 0.5 percent concentrate
A medium expansion foam is commonly used at a rate of 20:1 up to?
200:1
High Foam expansion is used the expansion rate from 200:1 to?
1000:1
A low foam expansion contains an air/solution ratio of up to 20 parts finished foam for every part of foam solution?
20:1
In order to calculate the application rate available for a from a specific nozzle?
Divide the flow rate by the area of fire
To calls or undergo a chemical process of decomposition involving the splitting of a bond and the addition of the element of water?
Hydrolyze
What type of foam is good for a hydrocarbon fuel product?
AFFF or FFFP
What are three common types of portable foam proportioners?
In line foam eductors
Foam nozzle eductors self-educting master stream nozzles
The pressure at the discharge side of the eductor must not exceed ________ percent of the eductor inlet pressure?
70 percent
The foam concentrate inlet to the eductor should be no more than _______ feet above the liquid surface of the foam concentrate?
6 feet
What are the techniques for applying foam to a fire or spill?
Direct- application method
Roll on method
Bank down method
Rain down method
