*TB 11- Dry Chem Extinguisher Flashcards Preview

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Flashcards in *TB 11- Dry Chem Extinguisher Deck (14):
0

Generally dry chemical is most effective on what types of fires?

Flammable liquids and gas fires

1

Dry chemical is approximately how much more effective than CO2 on
hydrocarbon fires?

Twice as effective

2

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

3

Is dry chem effective on metal fires?

No

4

Can dry chem be used safely on electrical fires?

Yes

5

The dry chem extinguisher is filled with _____ pounds of dry chemical.

20 pounds

6

The dry chemical extinguisher is pressurized to approximately ____ psi with compressed air.

165 psi

7

The nozzle of the dry chem extinguisher shapes the spray into a ____ degree stream.

60 degree

8

The discharge time of a 20-pound dry chemical extinguisher with the valve fully open is _____ seconds.

10 seconds

9

The extinguisher has an effective range of approximately ____ to ____ feet

15 to 20 ft

10

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

11

How often should the pressure gauge be checked to ensure a full charge of the extinguisher?

Daily

12

The extinguisher will function effectively only so long as the air pressure is between ____ to ____ psi.

125 to 175

13

How often should you remove the extinguisher from the rack, invert it, and shake to preclude any possibility of the chemical caking?

Monthly

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