Foam Flashcards
KK Bubble Cup nozzle are intended for what type of foam?
Class A
Hi expansion foam can achieve expansion ratio can be as high as ______ to ___ or higher
1000 to 1
Several different models are available that can create ______cubic foot per minute to ________ cubic foot per minute depending on the unit
1200to 14000
Hi expansion foam generators are powered by
Electricity diesel or water powered
Reduces the ability of fuels to absorb water
Surface tension
consists of a solvent a stabilizing agent and then some products a corrosion inhibitor
Class a foam
__________ More uniform bubbles will last longer then _________ less uniform bubbles
Smaller
Larger
Normally used to form an insulating blanket on a few will being treated
Dry from
Cools and what’s better than dry foam solution is slightly frothy and flows briefly and then stops when applied to a surface
Fluid foam
Dry foam is most frequently used for
Pre-treatment of exposures in the path of oncoming fires in a solution of .5 to 1%
Medium expansion nozzle to create a thick blanket
Fluid foam is used for
Deep-seated fires and mop up of some wild man and structure fires
Low expansion nozzle .5 to 1%
Medium expansion nozzle .3 to .5%
Flows easily and releases water very quickly
Wet foam
What foam should be used in
Initial attack and situations that dictate the use of standard fog nozzle
Mix ratio of .1 to .3% for adequate penetration
Two ways to mix foam concentrate with water are
Batch mixing and mechanical foam for proportioners
Types of proportioner’s
Around the pump proportioner
suction side proportioner eductors
Automatically regulated proportioner balanced pressure bladder proportioner
electronically controlled direct injection proportioner
Low expansion nozzles is from _______ to_______
1:1 to 20:1
Medium expansion nozzle generates expansion ratios from
20: one up to 200:1
Hi expansion nozzles are foam generators generates foam at the ratio of
200:1 and up
Standard nozzles used for a class a foam are
KK FS 20/60 duel gallonage bubble cup
Class a foam should be used on all fires involving
Ordinary combustible’s
When fighting vehicle fires rapid knockdown can be achieved by using a ____ to_____ % wet foam
.3 to .5%
On initial attack of a structure fire class a foam should be applied using a standard nozzle in a wet from consistency of
.1-.3%
Do not apply from blankets until cleared to do so by the
Ic or the investigator
The primary objective of class B foam is to control
Vapor in emissions
The lowest temperature at which a liquid will give off sufficient vapor to flash momentarily, when in ignition sources introduced, but not continue to burn
Flashpoint
Flammable liquids have a flashpoint below
100°F
Combustible liquids have a flashpoint above
100°F
The foam triangle is
Water, from concentrate, and air
The weight or density of a vapor compared to air being greater than one
Vapor density
The measure of weight of a liquid compared to water
Specific gravity
Class B foam will extinguish a fire involving _______ _______ hydrocarbons such as gasoline, diesel, or kerosene
Non polar
True or false Not all class B foams will extinguish a fire involving a polar hydrocarbon such as alcohol, acetone, or MEK
True
_______ _________ Will burn with the blue, green, light orange, or obvious Lee chemical colored flame
Polar solvents
AFFF commonly available and percentages foam concentrate
One, three, six
It is recommended firefighters not use wider than ____ degree fog when making foam with a standard fog nozzle
30
Three methods of applying foam are
Rainfall or lob method
Deflection method
Roll on or bounce method
