TB 011 - Pressurized Dry Chemical Fire Extinguishers

Question 1

The chemical itself is baking soda (sodium bicarbonate, ________ __) especially treated to make it resistant to caking and moisture, and capable of being readily dispersedinto a fire-killing cloud.

Answer 1

NaHCO 2

Question 2

Dry Chemical, in the presence of heat, releases carbon _______ and _______ vapor which provides a smothering action.

Answer 2

Dioxide Water

Question 3

Heat is absorbed by both the ______ particles and water vapor which provides cooling.

Answer 3

Solid

Question 4

Dry chemical is effective on fires involving deep-layer __________ liquids, natural ____ leaks, and ___________ flammable gas leaks and spills.

Answer 4

Flammable Gas Liquefied

Question 5

Dry chemical is approximately ______ as effective as CO2 on hydrocarbon fires, including ___________, for a given size extinguisher.

Answer 5

Twic Methane

Question 6

This extinguisher is especially suitable for use on fires in grease ducts above stoves, when applied into the ______ end of the duct.

Answer 6

Lower

Question 7

There has been an increasing use of dry chemical on Class A fires, especially in textile fibers such as ________.

Answer 7

Cotton

Question 8

When a car fire involving occupants is encountered, there are certain advantages to using dry chemical; the powder can be used as a ______ screen to quickly move in on the fire and rescue the occupants, in addition, the powder will not have any adverse effect on the occupants of the car, where the use of ______ spray on the victim could result in steam burns and would not allow as quick access to the car.

Answer 8

Heat Water

Question 9

If a reflash should occur and involve firemen or civilians, do not hesitate to engulf them in a cloud of ________.

Answer 9

Powder

Question 10

The dry chemical in these extinguishers can also be used to neutralize ______ spills.

Answer 10

Acid

Question 11

When an acid spill is encountered, pull the locking pin, hold the nozzle __ or __ feet above the acid, squeeze the valve just enough to allow the powder to flow gently from the nozzle and spread the powder over the surface of the acid.

Answer 11

2 3

Question 12

When fires are encountered involving leaks ofgases, especially those heavier than air (__________, ___________,etc.) the fire ordinarily should not be extinguished until control of the gas can be obtained

Answer 12

Butane Propane

Question 13

A disadvantage of using dry chemical is its lack of _______ after extinguishment.

Answer 13

Control

Question 14

Dry chemical is non-_______. Although some irritation of the _______ and nasal passages may be experienced, there should be no residual effect under normal conditions.

Answer 14

Toxic Throat

Question 15

The normal precautions should be taken, however, when moving into confined areas since the _________ content may be below that necessary for breathing.

Answer 15

Oxygen

Question 16

Because of its __________ characteristics, dry powder can be used safely’ on electrical fires, such as fires involving oil cooled electric switches and transformers.

Answer 16

Dielectric

Question 17

Because of its slight __________ and abrasive properties, it should be used with care on fires in fine electrical or electronic gear, such as printing presses, I.B.M. equipment, telephone switchboards, etc. This consideration, however, should be _________ to thecontrol of the fire.

Answer 17

Corrosive Secondary

Question 18

This extinguisher consists of: a. a shell of heavy gauge steel, tested to ____ psi

Answer 18

600

Question 19

This extinguisher consists of: a ______ reinforced hose

Answer 19

Nylon

Question 20

This extinguisher consists of: a _________ control squeeze grip valve.

Answer 20

Positive

Question 21

This extinguisher consists of: a nozzle which shapes the dry chemical into a ___ degree fan stream

Answer 21

60

Question 22

This extinguisher consists of: an air pressure gauge protected by a ________ guard.

Answer 22

Gauge

Question 23

The shell is filled with ___ pounds of dry chemical and then pressurized to approximately _____ psi with compressed air.

Answer 23

20 165

Question 24

This extinguisher has a rating of ___-B,C, meaning that in the hands of an average operator it is capable of extinguishing a ___ square foot deep-layer Class B fire, and is safe for use on fires involving _________ electrical equipment.

Answer 24

20 20 Energized

Question 25

An ________ operator will be able to extinguish an even larger “fire with this extinguisher.

Answer 25

Expert

Question 26

keep extinguisher _______ while in use

Answer 26

Upright

Question 27

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

Answer 27

10

Question 28

The 20 pound CO 2 extinguisher in use on the Department will last ___ seconds.

Answer 28

60

Question 29

When using the extinguisher on a fire, the valve normally should be ______ ______ to maintain proper discharge and to preclude any possibility of the valve becoming clogged.

Answer 29

Wide Open

Question 30

Best results are obtained with this type extinguisher by working from ___________ side of fire and floating powder in over the fire.

Answer 30

Windward

Question 31

With a ______-to-_____ sweeping action, cover the entire area of fire.

Answer 31

Side Side

Question 32

The extinguisher has an effective range of approximately ___ to ___ feet.

Answer 32

15 20

Question 33

To prevent splashing when using on depths of flammable liquid, care should be taken to direct the initial discharge from a distance not closer than __ to ___ feet.

Answer 33

6 8

Question 34

The pressure gauge should be checked ______ for a full charge.

Answer 34

Daily

Question 35

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

Answer 35

125 175

Question 36

MAINTENANCE; Inspect

____________ and after use to detect deteriorate worn, or damaged parts.

Answer 36

Periodically

Question 37

MAINTENANCE; Inspect nozzle periodically for any obstruction or collection of _________.

Answer 37

Moisture

Question 38

MAINTENANCE; Once each _______ , remove the extinguisher from the rack, invert it, and shake to preclude any possibility of the chemical caking.

Answer 38

Month

Question 39

RECHARGING; Tag the extinguisher with a F-175 tag and send it to the shops, whenever it needs to be recharged with ____ or dry chemical.

Answer 39

Air