Podcast
Questions and Answers
What NFPA Standard is referenced for portable fire extinguishers?
What NFPA Standard is referenced for portable fire extinguishers?
- NFPA 20
- NFPA 50
- NFPA 30
- NFPA 10 (correct)
How many classes of fires are there?
How many classes of fires are there?
5
What acronym is used to describe the operating principle of a fire extinguisher?
What acronym is used to describe the operating principle of a fire extinguisher?
PASS
Class A fires are represented by which color and symbol?
Class A fires are represented by which color and symbol?
Which class of fire are ordinary combustibles?
Which class of fire are ordinary combustibles?
Class B fires are represented by which color and symbol?
Class B fires are represented by which color and symbol?
What do Class B fires consist of?
What do Class B fires consist of?
Class C fires are represented by what color and shape?
Class C fires are represented by what color and shape?
Energized electrical equipment is which class of fire?
Energized electrical equipment is which class of fire?
Combustible metals comprise class ____ fires and are represented by which color and shape.
Combustible metals comprise class ____ fires and are represented by which color and shape.
Give examples of Class D or combustible metal fires.
Give examples of Class D or combustible metal fires.
Class K fires involve what?
Class K fires involve what?
Carbon Dioxide or CO2 extinguishers are rated for which classes of fire?
Carbon Dioxide or CO2 extinguishers are rated for which classes of fire?
What are two types of ABC rated extinguishers?
What are two types of ABC rated extinguishers?
Multipurpose dry chemical extinguishers are rated for which classes of fires?
Multipurpose dry chemical extinguishers are rated for which classes of fires?
Fires involving Class C materials should be ________________ first.
Fires involving Class C materials should be ________________ first.
What agency is responsible for testing and rating fire extinguishers?
What agency is responsible for testing and rating fire extinguishers?
An expert trained in the proper use of an extinguisher can expect _____ times more fire extinguisher potential.
An expert trained in the proper use of an extinguisher can expect _____ times more fire extinguisher potential.
A '1A' rated extinguisher means what?
A '1A' rated extinguisher means what?
Portable extinguishers are intended to be used on small fires in the __________ or ________ _________ phase.
Portable extinguishers are intended to be used on small fires in the __________ or ________ _________ phase.
A 10 'B' rated extinguisher would have the potential to extinguish ____ square feet of class B fire.
A 10 'B' rated extinguisher would have the potential to extinguish ____ square feet of class B fire.
Explain the extinguisher rating of 2A10BC.
Explain the extinguisher rating of 2A10BC.
Why would an extinguisher receive a class C rating?
Why would an extinguisher receive a class C rating?
How much water is in a 'Water Can', and what is the rating?
How much water is in a 'Water Can', and what is the rating?
Name some features that distinguish a CO2 extinguisher from other types.
Name some features that distinguish a CO2 extinguisher from other types.
How can you tell the readiness of a CO2 extinguisher?
How can you tell the readiness of a CO2 extinguisher?
What are typical inspection/test intervals for extinguishers?
What are typical inspection/test intervals for extinguishers?
Name 3 tests for Class A fires.
Name 3 tests for Class A fires.
Name 4 mechanisms by which extinguisher agents extinguish a fire.
Name 4 mechanisms by which extinguisher agents extinguish a fire.
Dry powder extinguishers are used for Class ___ fires ONLY.
Dry powder extinguishers are used for Class ___ fires ONLY.
What extinguishers are required on pumping apparatus by NFPA 1901?
What extinguishers are required on pumping apparatus by NFPA 1901?
Water mist extinguishers are rated for Class _____ & ______ fires and use ____________ water.
Water mist extinguishers are rated for Class _____ & ______ fires and use ____________ water.
Class K fires are extinguished using _______________ extinguishers.
Class K fires are extinguished using _______________ extinguishers.
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Study Notes
NFPA Standards and Ratings
- Portable fire extinguishers are governed by NFPA 10.
- There are five classes of fires identified by the NFPA.
Fire Classes
- Class A fires involve ordinary combustibles such as wood, paper, plastics, rubber, and textiles. Represented by a green triangle.
- Class B fires comprise flammable liquids and gases such as diesel fuel, kerosene, gasoline, and propane, marked by a red square.
- Class C fires involve energized electrical equipment, indicated by a blue circle.
- Class D fires consist of combustible metals like titanium, zirconium, and magnesium. Represented by a yellow star.
- Class K fires pertain to combustible cooking oils, vegetable or animal fats.
Operating Principles
- The operating principle of a fire extinguisher is summarized by the acronym PASS: Pull, Aim, Squeeze, Sweep.
Extinguisher Ratings
- Carbon Dioxide (CO2) extinguishers are suitable for Class B and C fires.
- ABC rated extinguishers can be classified as ordinary or multipurpose, rated for Class A, B, and C fires.
- A "1A" rated extinguisher equals 1.25 gallons of water; thus, a 4A rating equates to five gallons.
- A "10 B" rated extinguisher can extinguish a fire spanning 10 square feet.
Usage and Efficacy
- Energized electrical equipment should be de-energized or unplugged before using a Class C extinguisher.
- An expert trained in extinguisher use can achieve up to 2.5 times more fire extinguishing potential.
Extinguisher Features
- CO2 extinguishers lack a pressure gauge and feature a large horn or nozzle.
- Readiness of a CO2 extinguisher is determined by its weight.
- Dry powder extinguishers are specifically for Class D fires.
Inspection and Maintenance
- Monthly inspections are required by owners or employees.
- Licensed professionals must inspect extinguishers yearly.
- Extinguishers need to be checked after each use, when damage is suspected, and undergo maintenance every six years.
Specialized Extinguishers
- Water mist extinguishers are suitable for Class A and C fires, utilizing deionized water.
- Wet chemical extinguishers are designated for Class K fires.
- NFPA 1901 mandates two extinguishers suited for Class B and C fires on pumping apparatus, including specified ratings for dry chemical and water extinguishers.
Testing and Mechanisms
- Testing for Class A fires includes wood panel, wood crib, and excelsior methods.
- Extinguisher agents extinguish fires through various mechanisms: smothering, cooling, chain breaking, and saponification.
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