1. Fire Suppression Techniques Part 2

2. Common Firefighting Extinguishing Agents
Water
Foams
Halon 1211
CO2
Dry chemicals
Dry powders
Extinguishing agents are selected based on
the materials that are burning.
REVIEW CHAPTER 5

3. Suppressing Class B Fires ( flammable / combustible liquids and gases)
Key Terms:
Flammable liquid
Combustible liquid
Compressed gas
Flash point
Bleve
Vapour pressure
Vapour density
Specific gravity
Soluble / insoluble
Miscible / immiscible
Boiling point
Hydrocarbon
Polar solvent

4. Boiling Liquid Expanding Vapour Explosion
BLEVE
Boiling Liquid Expanding Vapour Explosion

5. BLEVE Warning Signs

7. Suppressing Large Class B Fires
Extreme caution.
Stop leak.
Avoid standing in fuel. (wicking)
Foam to extinguish large fire.
Large volumes of water to cool tank & reduce vapour pressure. (BLEVE)
Fog dissipates vapours.

8. Using Water to Control Class B Fires
Water as a Cooling Agent
Protect exposures.
Cool burning tanks.
Cool vapours in tanks.
Cool support beams and
other materials that may weaken.

9. Using Water to Control Class B Fires
Water as a Mechanical Tool

10. Using Water to Control Class B Fires
Water as a Mechanical Tool

11. Using Water to Control Class B Fires
Water as a Substitute Medium

12. Using Water to Control Class B Fires
Water as Protective Cover

13. Bulk Transport Vehicle Fires
Same techniques for controlling fires in storage vessels.
Traffic risks.
Water supply limitations.
Additional risks posed by location.
Instability of vehicle.
Container damage.

14. Passenger Vehicle Fires
Approach from sides.
Attack upwind.
Protect occupants.
ALWAYS WEAR SCBA

15. Passenger Vehicle Fires
Dangers:
Gas tank
Alternative fuel vehicles
Shocks
Bumpers
Tires
Battery
Pistons on liftgates
Strut suspension

16. Passenger Vehicle Fires

17. Passenger Vehicle Fires

18. Control of Gas Utilities
Natural Gas
40% Lighter than air.
Non toxic but will displace oxygen.
Distinctive odour.
Explosive range 5-15%
Fire / leak.
Notify Enbridge Gas.
Liquefied Petroleum Gas
Stored as a liquid when under pressure in container.
Expansion ratio
Vapour density 1.5. (heavier)
Explosive range %
NO ODOUR
Fire / leak.
BLEVE
Evacuate area.

19. Control of Gas Utilities

20. Suppressing Class C Fires
Hydro vaults, transformers, substations, commercial high voltage installations, etc.
Recognize the electrical danger.
Notify hydro.
Shut off power.
Use proper extinguishing agents and methods.
Ground gradient / step or touch potential.
Maintain safe working distances.

21. Suppressing Class D Fires
Combustible metals & alloys: magnesium, sodium, lithium, potassium.
No universal class D extinguishing agent.
Class D agents – dry powders.
Facilities that use or store these metals are required to maintain adequate amounts of extinguishing agent.
Water may cause a reaction / explosion.
CLASS D ARE CONSIDERED HAZMAT

22. Practical Learning Outcomes
Interior direct attack.
Interior indirect attack.
Combination attack.
Exterior fire attack.
Class B fire attack using water fog (2 teams).