TB 11 Dry Chem

Question 1

Dry chem in the presence of heat releases

Answer 1

Carbon dioxide and water vapor

Question 2

What can it extinguish

Answer 2

Flammable liquids, gases, and liquefied gases

Question 3

Dry chem is approximately ____ as effective as CO2 on hydrocarbon fires

Answer 3

Twice

Question 4

Dry chem can also be used for?

Procedure?

Answer 4

Neutralizing acid spill

Hold 2-3 feet above the acid, squeeze gently above the spill.

Question 5

Gases heavier than air

Answer 5

Propane butane

Question 6

Heavy metal fires?

Answer 6

Ineffective against magnesium and sodium

Question 7

Because it’s slightly corrosive it should be used with care on what types of fires

Answer 7

Electrical or electronic gear such as printing presses, IBM equipment, telephone switchboards etc

Question 8

Shell is composed of?

Answer 8

Heavy gauge steel tested at 600 psi

Question 9

Nozzle

Answer 9

Nylon reinforced and shapes dry chrm into a 60 degree fan stream

Question 10

Filled with ____ lbs of dry chem and pressurized to approximately ___ psi

Answer 10

20 lbs and 165 psi

Question 11

Discharge time of a 20 lb extinguisher with valve fully open

The department ones last

Answer 11

10 seconds

60 seconds

Question 12

Effective range of extinguishers?

To prevent splashing when using on depths of flammable liquids

Answer 12

15-20 feet

6-8 feet

Question 13

The extinguisher will function only as long as the air pressure is between ___ and _____

Answer 13

125 and 175