04/08/2025
Fire is a useful tool and a dangerous hazard in industry and daily life.To manage fire risks effectively, we must first understand what is fire and how it is classified based on the materials involved.
🔥🔥What is Fire?
Fire is a chain chemical reaction which occurs when a fuel combines with oxygen and produces heat, light, smoke, and flame.
For fire to start and continue, three elements must be present:
Heat 🔥 Fuel⛽ Oxygen often called the fire triangle.
🔥🔥Classification of Fire: Fires are categorized based on the type of material involved. This helps in selecting the correct extinguishing method:
✅Class A, Ordinary Combustibles: Fires involving solid materials such as wood, paper, cloth, and plastics.
Example: Office fire with burning paper.
✅Class B, Flammable Liquids and Gases: Fires involving petrol, diesel, oils, paint, alcohol, or gas.
Example: Fuel tank fire.
✅Class C, Electrical Fires: Fires caused by electrical equipment, such as short circuits, panels, or wiring.
Note: Once power is disconnected, it may fall into another class.
✅Class D, Metal Fires: Fires involving combustible metals like magnesium, titanium, or sodium.
These require special extinguishing agents.
✅Class K or ( F), Cooking Fats and Oils: Fires from kitchen appliances, involving cooking oil or grease.
Special wet chemical extinguishers are used.