Application of Portable Fire Extinguishers

Given a selection of portable extinguishers, full personal protective equipment, and a controlled instructional environment, the student will be able to demonstrate the proper techniques of inspecting, selecting, and using portable extinguishers...


Overview: Application of Portable Fire Extinguishers

• Purpose of Portable Fire Extinguishers

• NFPA Classification and Characteristics of Fuels

• Types of Agents

• Ratings of Extinguishers

• Types of Extinguishers

• Limitations of Extinguishers

• Care and Maintenance

• General Rules

• Practical Use of Fire Extinguishers

Instructors Notes: The above number of operational extinguishers is based uponthe following: PW - 4 students per extinguisher; CO2 - 2-3 students per extinguisher; DC - 4 students per extinguisher

Application of Portable Fire Extinguishers

SPO 1-1

Given a selection of portable extinguishers, full personal protective equipment, and a controlled instructional environment, the student will be able to demonstrate the proper techniques of inspecting, selecting, and using portable extinguishers on Class A, B, and C fires, so that the correct extinguisher is used for the class of fire, the fire is extinguished completely, and safe operations are practiced. The student will perform to a final written test accuracy of at least 70%, will receive a satisfactory score as determined by a practical skills checklist, and will meet job performance requirements for NFPA 1001 (1997), JPR 3-3.15.

EO 1-1

Describe the purpose of portable fire extinguishers. (JPR 3-3.15)

EO 1-2

Identify the classification and characteristics of fuels and how portable fire extinguishers extinguish them. (JPR 3-3.15)

EO 1-3

Identify four basic types of extinguishing agents, and describe how they extinguish fires. (JPR 3-3.15)

EO 1-4

Define how portable extinguishers are rated. (JPR 3-3.15)

EO 1-5

Identify the appropriate extinguisher and how to apply them for various classes of fire. (JPR 3-3.15)

EO 1-6

Describe the limitations of portable fire extinguishers. (JPR 3-3.15)

EO 1-7

Describe the care and maintenance of portable fire extinguishers. (JPR 3-3.15)

EO 1-8

Identify the general rules for portable fire extinguisher use. (JPR 3-3.15)

EO 1-9

Demonstrate the extinguishment of Class A, B, and C fires utilizing the appropriate portable fire extinguishers.(JPR 3-3.15)

Instructional Guide

I. Purpose of Portable Fire Extinguishers (1-1)

• Provide rapid, initial extinguishing agent for a sudden, unexpected fire involving various types of fires

• Under certain conditions or circumstances, hand-held portable fire extinguishers can be a primary tool for initial attack on a given fire scenario

• May be more effective and better suited for the job at the time than a fixed water source and hoselines

• More convenient to use in some locations: industry, schools, businesses, specific occupancies

Notes: mobile conveyance (fires), trash can (fires), electrical (fires), small flammable liquid (fires), industrial shop (fires)

II. NFPA Classification and Characteristics of Fuels (1-2)

Notes: Full PPE - SCBA as required to protect respiratory track. IFSTA Unit 5 S #8

Class A: ordinary

• Fires which occur in ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics

• Leaves glowing coal

• Leaves an ash

• Extinguishment: all purpose water, Class A foam, dry chemical

• Cooling removes heat side of triangle

• Smothering removes oxygen side of triangle

• Remove fuel side of triangle

• Class B: flammable/combustible liquids

Notes: Full PPE and SCBA.

• Fires which occur in flammable or combustible liquids, paints, gasoline, natural gas, greases, oil lacquer, mineral spirits and alcohol

• Fuel floats on water (specific gravity)

• Can't cool below flash point

Notes: Combustible liquids can be cooled.

• Extinguishment

• Smothering removes oxygen side of triangle: blanketing effect - reduce the production of oxygen vapors

• Cooling removes heat side of triangle: temperature reduction

• Remove fuel side of triangle and interruption in the chain reaction, and oxygen exclusion

Class C: energized electrical equipment

Notes: household appliances, computers, transformers, overhead transmission lines

• Fires which involve or are near energized electrical equipment, where the electrical non-conductivity of the extinguishing media is important