Foam Book 1
Card Set Information
Foam Book 1
What happens to a flame when it become hotter?
It becomes less luminous
What are acids?
They react with water to form hydrogen ions
What are Bases?
Corrosive water-soluble compounds that react with acids to form salts.
Class C fires
What are the oil capacities on transformers?
Large - 20,000gal - 25,000gal
Small - 300gal - 20,000gal
Solids and liquids w/high flashpoints can be extinguished by cooling with water.
Low flash point liquids and flammable gasses.
How much additional heat does each pound of boiling water need to turn to steam?
At 212°F, how much does water expand?
1,700 times its original volume
At 500°F, how much does water expand?
2,400 times its original volume
At 1,200°F how much does water expand?
4,200 times its original volume
What size bubble provide long lasting foam blankets that are highly desirable in post fire un-ignited spills?
Uniform sized bubbles
What key characteristic should be considered when choosing a foam concentrate for a specific application?
What are the expansion ratios for Low, Medium and High?
Med- 20:1 to 200:1
high- 200:1 to 1,000:1
Most modern foam concentrates can be stored for how long?
in excess of 10yrs
What are the storage temp requirements of UL foam?
not less than 35°F
not higher than 120°F
Freezing and thawing have no effect on UL listed foam
Who establishes the maximum allowable corrosion rates for Class A foam?
When AFFF is concerned the environmental issues revolve around?
Glycol ethers (butylcarbitol)
When did the Navy decide to begin seeking alternative products to replace PFOS and glycol?
What concentrations are high-expansion foams used at?
1% to 2.5%
How long have wetting agents been used in the fire-suppression industry?
since the 1940's
What is the shelf life of Class A foam concentrates?
What size bubbles are best for the development of long-lasting finished Class A foam?
Small bubbles of a consistent size.
What percentage are Class A foam concentrates mixed at?
.1% to 1%
Most foam nozzles produce more stable foam at what percentage?
What rate do you proportion Class A foam for "Fire attack and overhaul with standard fog nozzle?"
.2% to .5%
What rate do you proportion Class A foam for "Exposure protection with standard fog nozzle?"
.5% to 1%
What rate do you proportion Class A for "Most operation with air-aspirating foam nozzles?"
.3% to 1%
What rate do you proportion Class A foam for "Most operations with a compressed-air foam system?
.2% to .5%
What type of nozzles are used with Class B foams?
Standard fog nozzles (AFFF, FFFP)
Air-aspirating nozzles (all types)
Foam concentrates stored in accordance with manufacturers recommendations have an indefinite shelf life. What is not an unreasonable expectation?
What time frame do Protein based foam concentrates degrade?
usually 2-8 days
What time frame do Synthetic foam concentrates degrade in?
What is the key to long life vapor suppression?
Water retention properties
What affects the life of finished foam?
type of concentrate
Foam breaks down rapidly as the fuel temp rises. What temp will it become ineffective?
When the fuels temp is near or over 150°