 |
|
 |
| Nature of Fire |
|
Fire is a chemical chain reaction
involving rapid oxidation or burning of fuel. It needs three
elements to trigger fire: fuel, oxygen (O2), and heat. Fire chain
reaction will occur when all three elements are present in the
proper conditions and proportion. To prevent or extinguish a fire,
only one of these three elements needs to be eliminated.
Fire extinguishers were designed to
eliminate heat and oxygen, or creating barrier between fuel and
oxygen, depending on the contents of the extinguisher. Class 1A*,
5B*, and C* are the most common classes and represent 98% of all
fires. The contents in fire extinguishers that have them work are
either liquid, or more commonly, dry chemical. Liquid chemical or
water is used to reduce the heat, while dry chemicals interrupt the
fire reaction by creating a barrier between oxygen and the fuel
source.
Dry chemical is the most versatile
and widely used application for extinguishing of the common Class
1A*, 5B*, and C* fires.
|
|
|
 |
 |
|
|
|
|
|
|
|
|
|
 |
 |
 |
 |
 |
 |
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
