LESSON 5 Flashcards
the result of the chemical combination of a
combustible material (fuel) with oxygen in the
presence of enough heat.
Fire
(one that ordinary extinguishing agents can extinguish) results from combustion of fuel, heat, and oxygen.
Ordinary fire
When a substance that will burn is heated to a certain critical temperature called its “_”
Ignition temperature
a material, that
contains chemical elements that will react with oxygen, and under proper conditions, produce fire.
Fuel or Combustible material
we need 16% oxygen to sustain fire.
Oxygen
vapors of gases, which
are distilled during burning process of a material, are carried into the flame.
Chemical Chain Reaction
3 Methods of Heat Transfer
Conduction
Convection
Radiation
direct conduct of heat from one body to another.
Conduction
the circulating medium of
heat transfer, occurs upward.
Convection
when energy travels though space or material in waves.
Radiation
Products of Combustion
Fire Gases
Flame
Heat
Smoke
refers to the vaporized
products of combustion.
Fire Gases
is the visible luminous body of a burning gas, which becomes hotter and less luminous when it is mixed with increased amounts of oxygen.
Flame
is a form of energy, which is measured in degrees of temperature to signify its intensity. It is responsible for the spread of fire.
Heat
is a visible product of incomplete combustion.
Smoke
Phases of Burning
- Incipient Phase or Beginning Phase
- Flame Producing Phase or Free -
Burning Phase - Smoldering Phase
Fires involving ordinary
combustible materials, such as wood, cloth,
paper, rubber and many plastics.
Class A Fires
water is used in
cooling or quenching effect to reduce the
temperature of the burning material below its
ignition temperature.
Class A Extinguishment
Fires involving flammable
liquids, greases and gases
Class B Fires
The smothering or blanketing effect of oxygen exclusion is most
effective. Other extinguishing methods include removal of fuel and temperature reduction.
Class B Extinguishment
Fires involving energized
electrical equipment.
Class C Fires
This fire can sometimes be controlled by a non-conducting extinguishing agent. The safest procedure is always to attempt to de-energize high voltage circuits and treat as Class A or B fire depending upon the fuel involved.
Class C Extinguishment
Fires involving combustible metals, such as magnesium, titanium,
zirconium, sodium and potassium.
Class D Fires
Special extinguishing
agents are available for control of fire in each
of the metals and are marked specifically for
that metal.
Class D Extinguishment
Proper Use of Fire Extinguisher
Pull pin
Aim
Squeeze
Sway
● Be kept fully charge and in their designated
places
● Be located along normal paths of travel
● Not be obstructed or obscured from view
● Not be mounted higher than 5 ft. or 1.5 m. to the
top of the extinguisher if they weigh 40 lbs. Or
80 kg. Or less.
Requirements for Fire Extinguish
is a flexible material use to convey water under pressure from the source of water to the scene of fire.
Fire Hose
Types of Fire Hose
Woven-jacket, rubber lined
Wrapped or Braded in Plies
Unlined Hose
Fire service _ are similar to any other ladders in shape, design and
purpose, but the way in which they are use
requires them to be constructed under
rigid specifications.
Ladders
Types of ladders
Straight Ladder – also called wall ladder
● Extension Ladder
● Roof Ladder
● Collapsible Ladder
● Aerial Ladder
● Tower Ladder
is the careful removal of
victim from the unsafe place of safety.
Rescue Operation
the last line of defense in Industrial Hygiene control; it does not eliminate the hazard; it aids in controlling individual exposure
Personal Protective Equipment (PPE)
Hazard Identification
● Agent
● Physical Characteristic
● Route of Entry
● Effect from exposure
PPE Program Components
1) Selection
2) Fitting
3) Health Aspects
4) Issue
5) Proper Use
6) Compatibility
7) Maintenance
8) Disposal
9) Information & Training
10) Supervision
11) Reviews
12) Checklist
- Protection from direct physical injuries
(flying/falling objects, burns, abrasive
and sharp edges)
- Protection from biological, chemical
hazards and indirect physical injuries
(noise, heat)
