portable fire extinguishers state of georgia basic fire fighter training course
TRANSCRIPT
Fire Extinguishers2
CLASSES OF FIRE
Class A - ordinary combustibles
Class B - flammable liquids
Class C - energized electrical
Class D - Combustible metals.
Fire Extinguishers3
EXTINGUISHING AGENT Water
Used on class A firesExtinguishes by reducing
temperature
Fire Extinguishers4
EXTINGUISHING AGENT Foam
Used on class A and B firesExtinguishes by reducing
temperature and smothering
Fire Extinguishers5
EXTINGUISHING AGENT Halon
Used on class B and C firesExtinguishes by interrupting
the chemical chain reaction
Fire Extinguishers6
EXTINGUISHING AGENT Carbon Dioxide
Used on class B and C fires
Extinguishes by displacing the oxygen and smothering the fire
Fire Extinguishers7
EXTINGUISHING AGENT Dry Chemical
Ordinary base used on class B and C fires
Multipurpose base used on class A, B, and C fires
Extinguishes by interrupting the chemical chain reaction
Fire Extinguishers8
EXTINGUISHING AGENTDry Powder
Used on certain class D firesExtinguishes by smothering
the fire
Fire Extinguishers13
OBSOLETE EXTINGUISHERS
Includes:• All inverting type extinguishers • Soda acid• Inverting foam• Inverting cartridge operated• Carbon tetrachloride
All obsolete extinguishers should be removed from service
Fire Extinguishers14
EXTINGUISHER RATING
Letter Rating• denotes the class of fire on which extinguisher can be used
• may have multiple ratings
Numerical rating• only given for class A and B extinguishers
• denotes the relative extinguishing potential of the extinguisher
– 10A will extinguish ten times as much fire as 1A
– 10B will extinguish ten times as much fire as 1B
Fire Extinguishers16
EXTINGUISHER LABELING
Green Triangle A - for class A firesRed Square B - for class B firesBlue Circle C - for class C firesYellow Star D - for class D fires
Fire Extinguishers18
EXTINGUISHER LABELSExamples
Class A; not for class B, C
Class A, B; not for class C
Class B, C; not for class A
Class A, B, C
Fire Extinguishers19
USING PORTABLE FIRE XTINGUISHERS
Select the appropriate extinguisher
P - Pull the pinA - Aim the nozzleS - Squeeze the handleS - Sweep the nozzle from side to
side