7 - Extinguishers

Question 1

Extinguisher classifications

Answer 1

A, green triangle, ordinary combustible.
B, red Square, combustible liquid.
C, blue circle, energized equipment.
D, yellow star, combustible metals.
K, black hex, cooking oil

Question 2

Extinguisher ratings

Answer 2

A: 1-40, 1=50pcs of 5x5x50cm boards, or 5L of water.
B: 1-160, 1=0.09m² area
C: no rating
D: no rating
K: no rating

Question 3

Extinguisher agents

Answer 3

B dry Chem
C dry Chem
D dry powder (sodium chloride)
K wet chem

Question 4

Describe saponification

Answer 4

Saponification is a reaction that emulsifies the oil to form a type of soap that floats on the surface of the oil and prevents reignition of the oil vapors.

Question 5

3 criteria for class k extinguishers

Answer 5

Prevent reignition of oil for 20 minutes or reduce oil temp to at least 15.6C below is auto ignition temp.
Completely extinguish the fire.
Cause no splashing of flaming oil.

Question 6

3 occupancy hazard classifications

Answer 6

Light: A combustible small (school, office) so minimum fire severity.
Ordinary: A/B combustible greater (store, Warehouse), average fire severity.
Heavy: A/B combustible high (factories, spray paint), high fire severity.

Question 7

Extinguisher discharge and times

Answer 7

Dry Chem, 10A120BC, 10-25s, 2-4.5m, PTatP
Dry Chem, 10A80BcC, 10-25s, 2-4.5m. RL
CO2, 10BC, 10-30s, 1-2.5m. All
Backpack, 4A, 60-180s, 3-9m. PTatP
Metal X, 14kg, 10-25s, 2-4.5m. R

Question 8

REACT

Answer 8

Rescue.
Ensure door closed
Activate alarm.
Call 911.
Try to extinguish.

Question 9

PASS

Answer 9

Pull pin.
Aim nozzle.
Squeeze trigger.
Sweep, back and forth over fire base.

Question 10

Back pack pump, and foam concentrations.

Answer 10

4A, 20Litres. Use 100ml of class a foam concentrate to provide mixture of .5% foam solution.

Question 11

CO2 extinguisher works by _____ oxygen, therefore _____ the fire. They do not produce any effective _____. ______ is a danger with CO2

Answer 11

CO2 extinguisher works by displacing oxygen, therefore smothering the fire. They do not produce any effective cooling. reignition is a danger with CO2

Question 12

Dry Chem extinguishers 4 components

Answer 12

Pressure vessel.
Valve.
Pressurizing gas (dried air, CO2, nitrogen).
Extinguishing agent (sodium bicarb, potassium bicarb, potassium chloride)

Question 13

Dry Chem extinguishing agents

Answer 13

Monoammonium phosphate (ABC)
Potassium bicarbonate (purple k)
Sodium bicarbonate (cheaper bud less effective)
MONNEX (Superior but more expensive)

Question 14

Dry powder agent and metals capable of extinguishment

Answer 14

Metal X - Sodium, potassium, magnesium, NaK alloys.

Question 15

CO2 operation considerations

Answer 15

Ensure safe approach
Wind to back.
PASS
If energized fire, Ensure disconnected.
CO2 gas can reach -100C
Static electricity will build up in horn while spraying.
Never turn away from fire