Fundamentals of Fire Safety: Presented by Kiran K. Joy
Fundamentals of Fire Safety: Presented by Kiran K. Joy
Fundamentals of Fire Safety: Presented by Kiran K. Joy
Fire Safety
Presented by
Kiran K. Joy
Outline
-
Introduction
Fire Chemistry
Fire Classification.
Extinguishing agents
Controlling fire hazards
OBJECTIVES
INTRODUCTION
CHEMISTRY OF FIRE
CHEMISTRY OF FIRE
1 Oxygen
2 Fuel
CHEMISTRY OF FIRE
3 Heat
Heat of Combustion
Other sources of heat can cause ignition
Chemical reaction
Decay
Slow oxidation
Spontaneous combustion
Electricity - arching, resistance heating
Mechanical friction
4 Chemical
Chain reaction
CHAIN REACTION
H*
H*+O2
OH+H2
H2O
H+O2
OH*+H 2
O*+H2
OH*
OH*+H2
H*
H2O
O+H2
H2O
H*+O2
OH*
H 2O
O*+H2
OH*+H2
OH*
H*
H*+O2
OH*
H*
FLAMMABILITY LIMITS
EXTINGUISHING FIRES
Oxygen
Heat
Fuel
Chain Reaction
EXTINGUISHING FIRE
Cooling
Removes heat - Applying water
Starvation
Removing fuel - Shut off gas or
liquid supply or pump liquid from
burning tanks
Limiting Oxygen
Mechanical smothering
Foam
Displace oxygen with inert gas
Interrupting Chain reaction
Capture free radicals using an
extinguishing agent
EXTINGUISHING FIRES
Fire Classification
- Extinguishing methods are based on Fire class
Class A
Class B
Flammable Liquids
Water may aggravate a burning liquid fire
Extinguish with foam, Chemical agent
Extinguishing Fires
Fire Classification (Cont.)
Class C
Flammable gases
Extinguish by starvation or chemical agents
Class D
Combustible metals fires
Extinguish by smothering with dry powders
Water will cause burning metals to explode
Class F
EXTINGUISHING AGENTS
Water
EXTINGUISHING AGENTS
Foam Aqueous Film Forming
Foam (AFFF)
INERT GASES
Carbon dioxide, Nitrogen etc
Displaces oxygen
Potentially fatal due to O2 deficiency
Mono-ammonium
Phosphate, Sodium
or potassium
bicarbonate type.
For class A, B or C
Fires
Inhibits chain reaction
Excludes oxygen by
coating surfaces
Summary
Questions and Answers
True or False?
THANK YOU