Chapter 7: Portable Fire Extinguishers

True

(T/F) Portable fire extinguisher ratings are classified according to the types of fire for which they are intended. (351)

True

(T/F) Types of portable fire extinguishers are organized by the type of agent and method used to expel contents. (342)

A- Involve ordinary combustibles textiles, paper, wood, plastics, rubber. B- Flammable and combustible liquids and gases, alcohol, gasoline, lubricating oils C- Electrical equipment/ use water mist once power supply is pulled treat as class A-B D- Combustible metals, alloys, magnesium, potassium, sodium (wheels and autobody) K- Combustible cooking oils, vegetable, and animal fats.

List and then briefly define the classifications of portable fire extinguishers. (341-342)

Classification, ratings, hazards to be protected, size of fire, atompheric conditions, available personnel, handling extinguisher, life hazards or operational concerns.

List at least three factors that impact selecting portable fire extinguishers. (354)

- Dry Powder- Cass D fires - Pump-Type water extinguishers- worn on the back and used on Class A. - Stored-Pressure Water Extinguishers (APW): Used during overhaul in Class A. - Water Mist Stored Pressure- Uses deionized water for class ABC - Wet chemical stored pressure extinguisher- Used for class K fires, kitchen, hospital, restaurants. Potassium based low PH agent, saponification and combines with oil to create a soapy film. - Dry Chemical- ABC

List four types of portable fire extinguishers and then breifly describe what each is designed for. (345-348)

Class A: Ratings 1-A to 40A, based on gallons. 1-A= 1 1/4 gallons, 2-A=2 1/2 gallons. Class B: Ratings 1-B to 640-B, Based on Square ft. Class C: Non-Extinguishing, tests are to determine nonconducting. Class D: No Numerical Ratings. Tested for reaction, type of metals, burn out time. Class K: No numberical ratings, tested to ensure effectiveness against 2.225 sqft.

List the class ratings used for portable fire extinguishers and describe the test or qualifications each is based on. (351-352)

False- Fire department- specified by department standards and SOPS and NFPA 10. Private- Regulated by locally adopted codes and standeds.

Maintenance for both fire department and privately owned portable fire extinguishers is based on the NFPA 10. (357)

False- The operating procedures for each type are similar.

Most portable fire extinguishers are operated in very different ways. (354)

False- Are classified by the type of fire they are designed to effectively extinguish.

Potrable fire extinguishers are only classified by the type of extinguishing agent used. (340)

Minimize risk to life and property and are effective in extinguishing the fire.

What are two goals used when selecting a portable fire extinguisher? (354)

Water mist, use deionized water as an agent and nozzles that produce fine spray instead of steady stream. The impurities in the water make it electrically conductive. Can use on class C and A.

What are water mist stored pressure fire extinguishers?