*TB 11- Dry Chem Extinguisher Flashcards
Dry chemical is approximately how much more effective than CO2 on
hydrocarbon fires?
Twice as effective
When an acid spill is encountered, hold the nozzle ____ or ____ feet above the acid. Allow the powder to flow gently from the nozzle and spread over the spill.
2 or 3 ft
Is dry chem effective on metal fires?
No
Can dry chem be used safely on electrical fires?
Yes
The dry chem extinguisher is filled with _____ pounds of dry chemical.
20 pounds
The dry chemical extinguisher is pressurized to approximately ____ psi with compressed air.
165 psi
The nozzle of the dry chem extinguisher shapes the spray into a ____ degree stream.
60 degree
The discharge time of a 20-pound dry chemical extinguisher with the valve fully open is _____ seconds.
10 seconds
The extinguisher has an effective range of approximately ____ to ____ feet
15 to 20 ft
To prevent splashing when using the dry chem on a flammable liquid, care should be taken to direct the initial discharge from a distance not closer than ____ to ____ feet.
6 to 8 ft
How often should the pressure gauge be checked to ensure a full charge of the extinguisher?
Daily
The extinguisher will function effectively only so long as the air pressure is between ____ to ____ psi.
125 to 175
How often should you remove the extinguisher from the rack, invert it, and shake to preclude any possibility of the chemical caking?
Monthly
Generally dry chemical is most effective on what types of fires?
Flammable liquids and gas fires
Dry chemical extinguishers are tested to?
600 psi
