fire

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Unit 5
Reducing Hazards in
Agricultural Mechanics

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The Fire Triangle
• Three components
– fuel
– heat
– oxygen
All three components must be present
at the same time for fire to occur

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Preventing Fires
• To prevent, control, or stop fires
– Store fuels in approved containers
– Store fuels away from other flammable materials
– Store materials below their combustion temperature
– Use fire only in safe surroundings
– Put out fires by removing one or more elements in the
fire triangle

4. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Fire Classes
• Class A: Ordinary combustibles
• Class B: Flammable liquids
• Class C: Electrical equipment
• Class D: Combustible metals

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Types of Extinguishers
• Water: class A fires
• Carbon dioxide: class B fires
• Dry chemical: class A, B, and C fires
• Blanket: used to smother fires on animals or
humans

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Extinguisher Labels
• Symbols
– Green triangle: class A
– Red square: class B
– Blue circle: class C
– Yellow star: class D

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Location of Extinguishers
• A clean, dry location near an exit and within
easy reach
• Hung so that top is 3.5 to 5 feet above the
floor
• Hung so that bottom is at least 4 inches
above the floor

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How to Use an Extinguisher
• For most extinguishers
– Hold upright
– Remove pin
– Stand 6 to 10 feet away from fire
– Direct nozzle toward base of fire
– Press lever

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Extinguisher Safety
Precautions
• Inspect extinguishers monthly
• Watch for hazard signs
• Think before acting
• Call for help immediately

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Signs of Danger
• Slow-moving vehicle emblem (SMV):
– Reflective orange triangle with red strip on all three sides
– Identifies vehicle under 25 MPH

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Signs of Danger (continued)
• Package labels
– List important product information, hazards,
precautions, and instructions
– Keep materials in original containers with original
labels attached
– Always read label prior to use, disposal, or storage

12. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Emergency Procedure for Fires
• Notify teacher
• Remain calm
• Activate fire alarm
• Call fire department
• Evacuate the area
• Use fire extinguisher(s) if possible

13. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Emergency Procedure for
Accidents
• Send for help
• Call 911—ambulance or police
• Do not move victim unless they are in immediate
danger
• Try to awaken victim if unconscious
• Treat for shock
• Stop bleeding if present
• Perform CPR if no sign of breathing and/or
circulation

14. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Important Terms
• Combustion: to burn
• Fuel: combustible material
• Heat: energy that causes the temperature to
rise
• Oxygen: a gas in the atmosphere
• Extinguished: put out
• CPR: cardiopulmonary resuscitation