7Suppressing 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.
8Using Water to Control Class B Fires Water as a Cooling AgentProtect exposures.Cool burning tanks.Cool vapours in tanks.Cool support beams andother materials that may weaken.
9Using Water to Control Class B Fires Water as a Mechanical Tool
10Using Water to Control Class B Fires Water as a Mechanical Tool
11Using Water to Control Class B Fires Water as a Substitute Medium
12Using Water to Control Class B Fires Water as Protective Cover
13Bulk 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.
14Passenger Vehicle Fires Approach from sides.Attack upwind.Protect occupants.ALWAYS WEAR SCBA
15Passenger Vehicle Fires Dangers:Gas tankAlternative fuel vehiclesShocksBumpersTiresBatteryPistons on liftgatesStrut suspension
18Control of Gas Utilities Natural Gas40% Lighter than air.Non toxic but will displace oxygen.Distinctive odour.Explosive range 5-15%Fire / leak.Notify Enbridge Gas.Liquefied Petroleum GasStored as a liquid when under pressure in container.Expansion ratioVapour density 1.5. (heavier)Explosive range %NO ODOURFire / leak.BLEVEEvacuate area.
20Suppressing 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.
21Suppressing 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
22Practical Learning Outcomes Interior direct attack.Interior indirect attack.Combination attack.Exterior fire attack.Class B fire attack using water fog (2 teams).