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 AgentProtect exposures.Cool burning tanks.Cool vapours in tanks.Cool support beams andother 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.
18 Control 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.
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).