Hose Nozzles And Flow Rates Flashcards
(30 cards)
What are the main types of fire streams available?
Solid stream
Fog stream
Broken stream
When would special purpose nozzles be used?
To operate effectively in unusual locations, or on specific fuels.
Why is it important to take into account nozzles pressure and reaction?
Excessive nozzles pressure may produce a reaction that may seriously injure firefighters and hamper fire suppression efforts.
Which type of nozzle produces a tight stream with little spray or shower effect?
Solid stream nozzle
The flow and reach of a solid stream nozzle is determined by the size of the discharge orifice and the…
nozzle pressure
Solid stream nozzles on handlines should generally be operated at a maximum pressure of…
350 kpa
At what maximum pressure should solid stream master stream appliances be operated?
550 kpa
Periphery deflected streams are produced by deflecting water around…
an inside circular stem in the nozzle
What type of fog stream breaks water into fine, evenly divided particles by driving several jets of water together at an angle?
Impinging stream
(also a fog nozzle)
Impinging stream nozzles most often provide a…
wide angle fog pattern
The reach of a fog stream is directly related to…
the wind
The type of nozzle that is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure is called…
Constant flow fog nozzle
The type of nozzle that allows the firefighter operating the handline to select the flow rate to suit fire and operating conditions is called the…
selectable gallonage nozzle
When properly supplied, both a selectable gallonage nozzle and a _______ will discharge predetermined gallonage.
constant flow nozzle
A type of variable nozzle with the ability to change patterns while maintaining the same nozzle pressure is called the…
automatic fog nozzle
If the gallonage supplied to an automatic fog nozzle changes, the automatic nozzle….
adjusts to maintain virtually the same pressure
Which type of nozzle produces a stream with significant forward velocity and relatively low volume of water delivery?
High pressure fog nozzles
Which of the following would high pressure fog nozzles be BEST suited for?
Vehicle fire
Wildland fire
Multiple occupancy fire
Industrial occupancy fire
Wildland fires
Why is 1400 lpm generally the maximum flow for a handline?
Greater flows will produce a nozzle reaction that is difficult or dangerous for firefighters to handle.
What can be said about master stream nozzles…
They generate considerable nozzle reaction due to their high flow rate.
An incident where master streams are most likely to be used is…
when personnel are limited
What is an advantage of master streams?
They offer the ability to operate at a greater distance from the fire
Each type of master stream monitor has the ability to change the stream direction or angle…
while water is being discharged
Which type of master stream appliance has flow limitations when removed from the apparatus and placed on the ground?
Combination monitor
