Polar solvents – Flammable liquids that ___
readily with water including
Advantage of using compressed-air foam (CAFS)
Foam produced ________ well to vertical
surfaces
Foam Injection systems are commonly employed in apparatus-mounted o_____ fire protection system applications
Class B foam concentrates are manufactured from either a synthetic or
________base
NFPA® 1963 – Established ___ general categories
Class B – Intended for use on flammable______
To ______Water Hammer slowly close
a. Nozzles
b. Hydrants
c. Control valves
d. Hose clamps
Fire stream must deliver volume of water sufficient to ______ heat faster than fire generates heat
_______-expansion foam Typically used in confined spaces
Greatest horizontal reach Under ideal circumstances – Attained at 45
degrees from horizontal plane In _______ operation – Are angles between 30 and 34 degrees
Water broken into small particles or droplets absorbs heat, converts to steam more ______
_________(penetrating) nozzles Used to extinguish fires in i. Attics
Basements & Other confined spaces
___-expansion foam Air/solution ratio up to 20 parts finished foam for every part of foam solution (20-to-1 ratio)
The smooth bore nozzle tip size should not be larger than______the diameter of the hose.(2wds)
Friction loss in fire hose _______ by
a. Rough linings in fire hose
b. Damaged hose couplings
c. Sharp bends in hose
d. Number of adapters
e. Length of hose lay
f. Hose diameter
Fire Fighting Foam
________ Prevents air from reaching fuel and mixing with vapors and prevents release of flammable vapors, reducing possibility of ignition, reignition
A Constant __________ fog nozzle has an Adjustable pattern, constant discharge rate throughout range of patterns at desired nozzle pressure
_____ foam eductors iMost common type of foam proportioner used
in fire service
When water turns to steam in upper layer of hot smoke and fire gases, upper layer tends to ______
Concentrates may be mildly irritating to skin and____
When water flows from smooth bore nozzle, it creates force in direction of stream and equal force in ________ direction
One person can _______ smooth bore nozzle on 11⁄2-inch (38 mm) or smaller hoseline
_________ needed to produce adequate amount of foam bubbles to form effective foam blanket
Water vaporized into _____ expands
a. At 212°F (100°C) expands approximately 1,700
times original volume
__________expansion foam Used at ratio of 20-to-1 to 200-Used to suppress vapors from hazardous materials spills when applied at expansion ratios of 30-to-1 and 55-to-1
______ Method Directs foam stream on ground near front edge of burning liquid spill (2wds)