Phx Fire Vol 2 (Deck 8) Flashcards
202.12E - 202.14B
Considerations for laying supply lines in relation to access problems.
Access problems they create, and when possible, should be laid along the hydrant-side of the roadway and crossed over at the fire if necessary.
How does slower speed when laying supply lines provide advantages?
Reduce the risk of accidents, provide time for evaluation of critical fire ground factors, and allow the Engineer to appropriately spot the apparatus.
Define pumped water supply and its critical operation.
Including Humat Valve Operation, is critical when large volumes of water are required in any tactical position, providing adequate water volume for attack operations involving engine company mounted master streams, ladder pipes, or multiple high volume attack lines.
Advantages of providing key pumpers on hydrants in fire ground safety?
Uninterrupted water supply, provides volume for long supply lines, and allows pumping water through the forward pumper in the event of mechanical failure.
Circumstances under which the need for pumped water occurs in fire attack operations.
Occurs once initial fire attack operations have been established, and it is critical when large volumes of water are required in any tactical position, such as for engine mounted master stream operations or multiple high volume attack lines.
Standard ‘big water’ evolutions for fire stream management.
Involve a forward and key pumper, 2 supply lines between them, and pumped water by the key pumper supplying the 2 supply lines.
What qualifies as 1000+ gpm appliances for fire stream management?
Aerial platforms or aerial ladders.
Objective of attack hose line choice in fire stream management.
Provide enough water volume and reach to overcome the heat energy and heat release rate of the fire or to effectively cool and protect exposures.
How should basic attack hose line placement be approached in the offensive strategy?
Adequate water volume should be used to put water on the fire and/or onto burning compartment surfaces as quickly as possible.
Placement of the first water stream in fire stream management when operating in the offensive strategy.
Extinguish and/or cool the most endangered interior compartments from the most advantageous position (interior or exterior) to best impact tenability of victims and/or FFs conducting rescue efforts.
Characteristics of a solid or straight stream in firefighting.
Greater penetration, reach, striking power, and cooling of interior and exposed spaces, with less steam conversion.
Fog pattern and its effectiveness in confined spaces.
Narrow, medium, and wide patterns, with smaller water droplets, greater air entrainment, and greater steam production. It is most effective in confined spaces such as attics.
What are the hose and nozzle packages carried on Engine Companies?
1 ¾” hose line with automatic nozzles (x2 minimum), 2” hoseline with smooth bore nozzles (x1), and 2 ½” hose line with smooth bore nozzles (1 or 2 depending on apparatus configuration), including a Blitz Monitor with solid bore or peripheral tips.
How should an offensive fire attack be centered and what considerations must be made if the initial attack does not control the fire completely?
Knocking the fire down and cooling the interior spaces. Considerations must be made to determine if the fire requires more water or if the fire attack needs to come from alternate positions (interior or exterior).
Most effective way to extinguish a fire in a burning compartment or room using water.
Initially cool the interior temperatures with water on the interior surfaces, followed by directing water onto the burning fuels directly with a straight or solid bore stream to limit steam production and create cooling of the interior environment.
Do fires that begin on the exterior of a building or occupancy require a different fire attack approach compared to fires starting on the interior?
Yes, attack to begin on the exterior fire and then move to the interior, as initiating an interior attack without controlling the exterior fire will continue to feed the interior fire from the exterior.
Define the importance of early identification of the flow path direction.
Allows determination of the best method of fire attack, working within the intake portion of the flow path rather than against it, and considering changes to the ventilation profile to create favorable conditions for a fire attack.
How should FFs initiate the fire attack when wind conditions are present?
With the wind at the back of the FFs to prevent wind-driven conditions from affecting the fire attack.
Impact of fire behavior research on the most effective use of water for fire suppression.
Water on the interior surfaces of a burning compartment, followed by water on the burning fuels directly, using a straight or solid bore stream to limit steam production and create cooling of the interior environment.
Potential limitations of operating nozzles through small openings into confined spaces.
Access is limited, making it difficult to get water on interior surfaces and structural components for effective surface cooling.
Most effective approach for extinguishing basement fires.
Applying water from the same level as the fire, especially through man-door access, allows for the most effective water application on the interior surfaces.
How should fire companies approach applying water to a burning space in buildings or conditions that require breaching walls/floors?
Realize the potential limitations and breach walls/floors to apply water to the burning space.
Potential adverse effects of using exterior master streams with interior operations in the same structure or occupancy.
Structural stability immediately and over time due to the powerful striking force and significant water weight.
Company/Sector Officers’ responsibility regarding fire streams?
Effectiveness of their fire streams, maintain awareness of where fire streams are going, their effectiveness, and report operational characteristics back to the Sector Officer or Command.