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