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Fire Suppression Techniques Part 2. Common Firefighting Extinguishing Agents Water Water Foams Foams Halon 1211 Halon 1211 CO 2 CO 2 Dry chemicals Dry.

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Presentation on theme: "Fire Suppression Techniques Part 2. Common Firefighting Extinguishing Agents Water Water Foams Foams Halon 1211 Halon 1211 CO 2 CO 2 Dry chemicals Dry."— Presentation transcript:

1 Fire Suppression Techniques Part 2

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

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

4 BLEVE Boiling Liquid Expanding Vapour Explosion

5 BLEVE Warning Signs

6

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

8 Using Water to Control Class B Fires Water as a Cooling Agent Protect exposures. Protect exposures. Cool burning tanks. Cool burning tanks. Cool vapours in tanks. Cool vapours in tanks. Cool support beams and Cool support beams and other materials that may weaken. 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. Same techniques for controlling fires in storage vessels. Traffic risks. Traffic risks. Water supply limitations. Water supply limitations. Additional risks posed by location. Additional risks posed by location. Instability of vehicle. Instability of vehicle. Container damage. Container damage.

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

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

16 Passenger Vehicle Fires

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18 Control of Gas Utilities Natural Gas 40% Lighter than air. 40% Lighter than air. Non toxic but will displace oxygen. Non toxic but will displace oxygen. Distinctive odour. Distinctive odour. Explosive range 5-15% Explosive range 5-15% Fire / leak. Fire / leak. Notify Enbridge Gas. 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. Hydro vaults, transformers, substations, commercial high voltage installations, etc. Recognize the electrical danger. Recognize the electrical danger. Notify hydro. Notify hydro. Shut off power. Shut off power. Use proper extinguishing agents and methods. Use proper extinguishing agents and methods. Ground gradient / step or touch potential. Ground gradient / step or touch potential. Maintain safe working distances. Maintain safe working distances.

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

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


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