Chapter 5 Portable Extinguishers

Question 1

Extinguishers

Answer 1

• one of the most common fire protection appliances in use today - Fixed facilites and appartus - Excellent in incipient fires

Question 2

NFPA 10

Answer 2

Standard for Portable Fire Extinguishers

Question 3

NFPA 1901 Requires that pumping apparatus have what for extinguishers

Answer 3

-minimum dry chem 80B:C -(CO2) Carbon Dioxide 10B:C -2 1/2 gal water extinguisher

Question 4

ABC

Answer 4

2 1/2-30lbs Reach 5-20’ 8-25 seconds

Question 5

Pump tank

Answer 5

1 1/2-5gallons Reach 30-40’ 45 seconds to 3 minutes A fires only

Question 6

Stored-Pressure water extinguishers

Answer 6

(air-pressurized water) “APW” small class a fires, hot spots, chimney flue fires -Compressed air or Nitrogen

Question 7

AFFF

Answer 7

Aqueous Film Forming Foam A&B fires Compressed Air or Nitrogen Suppresing vapors by rain down or deflect off object -Different than APW in two ways - Specific amount of AFFF concentrate - Air aspirating nozzle Not effective on flamable liquids that are water-soluble(polar solvents) Alcohol & Acetone

Question 8

Halon Extinguishers

Answer 8

• Two most common - Halon 1211 ( Bromochlorodifluoromethane) - Halon 1301 ( Bromotrifluoromethane)

Question 9

Carbon Dioxide Computer labs

Answer 9

(CO2) B & C fires ( displaces O2 & Smothers) less than 15’. - Handheld & Wheeled units, Discharge in gas, Limited reach, Stored under its own pressure as liquified gas. -wheeled units most common @ airports & industrial facilites

Question 10

Dry Chemical

Answer 10

ABC or BC Fires *Most common in use today -Two types (BC/ABC) -Common used dry chemicals are Sodium Bicarbonate, Potassium Bicarb, Urea Potassium Bicarbonate, Potassium chloride, Monommonium Phosphate - Corrosive to metals

Question 11

Dry Powder

Answer 11

Class D fires only

Question 12

Handheld Units

Answer 12

-Two basic designs - Stored- Pressure, simiular to APW with constant pressure about 200psi - Cartridge- operated, plunger pushed to energize Nitrogen or carbon Dioxide

Question 13

Extinguisher Rating System

Answer 13

A triangle green, ordinary combustibles

B box red, flammable liquids

C circle Blue, Electrical

D Star Yellow, Combustible metals

Question 14

Extgusiher rating systems for class A,B,C,D

Answer 14

• Class A - 1A-40A water - 1A=1 1/4 gallons, 2A= 2.5 gallons or twice of 1A
• Class B - 1B-640B - Square foot of flammable liquid that a nonexpert could put out.
• Class C No fire extinguishing
• Class D ratings vary with type of combustible metals being tested Reactions between the metals and agent Toxicity of the agent Toxicity of the fumes produced & the products of combustion. Time to allow metal to burn out without fire suppression efforts versus time to extinguish

Question 15

Mulitple markings on extinguishers

Answer 15

Most common are A-B-C, A-B & B-C

Question 16

Two systems of labeling portable Extinguishers

Answer 16

• Geometric shape , triagle, box, circle, star
• Pictographs

Question 17

Inspecting extinguisher immediately before use

Answer 17

• External condition, no apparent damage - Hose/Nozzle, in place - Weight- Feels as though it contains agent - Pressure gage (if available), in operable range

Question 18

Use of Extinguisher

Answer 18

• Select approprite size & type - approach from windward side (wind at back) - If not extinguished after full extinguisher, back of & reasses. - Lay empty extinguishers on their side

Question 19

Inspecting Extinguishers

Answer 19

• Inspect regularly to ensure accessible & operable, designated loacation, & not been activated and tampered with. - Servicing is the responsibility of the property owner or building occupant.

Question 20

During Inspections

Answer 20

-Check for proper loaction, Accessible & inspection tag date. - Check discharge nozzle or horn, obstuctions, cracks, dirt or grease - Check shell for damage, lock pins, tamper seals, full of agent & pressure, weight - Instructions of nameplate are legible - If found deficant in weight by 10% remove from service.

Question 21

3 important factors that determine the value of extinguishers?

Answer 21

• Serviceability - Accessibility - User’s ability to operate it

Question 22

Inverting type Extinguishers

Answer 22

Stopped in 1969 29CFR1910-157 Sept 12,1980 needed to remove all inverted soft solder, revited by , Jan 1982