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40 Cards in this Set
- Front
- Back
A stream of water or other extinguishing agent after it leaves a nozzle until it reaches the desired point. |
Fire stream
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What are the three basic types of fire streams?
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-Solid
-Fog -Broken |
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Fire stream produced from fixed orifice, smooth bore nozzle.
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Solid stream
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Smooth bore nozzle flow formula
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GPM= 29.7 x D2 x √NP
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A turning or state of being turned; a turning from a straight line or given course; a bending; deviation.
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Deflection
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During the time a stream of water passes through space, It is influenced by what things?
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-Velocity
-Gravity -Wind - Friction with the air |
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Type of stream from a fog nozzle that closest resembles a solid stream.
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Straight stream
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What pressures are solid hand-line and master streams
operated at? |
50 psi
and 80 psi |
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The line bounding around a surface; outward boundary of an object distinguished from its internal regions.
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Periphery
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To strike or dash about or against; clashing with sharp collision; to come together with force.
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Impinge
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Most constant flow nozzles are intended to be operated at a nozzle pressure of what?
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100 psi
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If the gallonage to an Automatic nozzle changes, it maintains approximately the same what?
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nozzle pressure and pattern
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Within it’s design limits, an automatic nozzle maintains a constant nozzle pressure of approximately ___ psi.
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100
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Any fire stream that is too large to control without mechanical aid.
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Master Stream
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What are the four major categories of master stream devices?
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-Monitor
-Turret -Deluge Set -Elevated Master Stream |
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Some constant flow nozzles operate at lower pressures of 50-75 psi for what special purpose?
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High-rise Fire Fighting
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Most fog nozzles are designed for a ___psi discharge pressure.
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100 psi
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The maximum amount of water that can safely flow through a handline nozzle.
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350 gpm
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What are smoothbore and fog master streams operating pressures?
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80 psi
and 100 psi |
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What is the difference between a monitor and a deluge set?
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The stream direction and angle can be changed while water is flowing.
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What are the three basic types of monitors?
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-fixed
-portable -combination |
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Large-capacity nozzles that are designed to be placed on the end of an aerial device.
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Ladder Pipe
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Why is movement of ladder pipe nozzles limited to vertical up and down motions?
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Horizontal movement of the nozzle puts too much stress on the aerial ladder.
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What is another name for a cellar nozzle?
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distributor
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Nozzle commonly used in aircraft fire fighting and to apply water to areas that are otherwise inaccessible to water streams.
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Piercing Nozzle
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A turret pipe is also called?
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deck gun
or deck pipe |
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Master stream device used in conjunction with aerial ladders where detachable ladder pipes are attached to the rungs of the ladder and are supplied by a fire hose.
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Elevated master stream
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Stream created when water is forced through a series of small holes on the discharge end of the nozzle.
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broken stream
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Nozzle that produces a fan shaped stream intended to protect combustible materials from heat of an adjacent fire.
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water curtain nozzle
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Another name for a piercing nozzle.
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Penetrating nozzle
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The jet nozzle at the end of, at piercing nozzle, is capable of delivering how many Gpm?
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100gpm
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The counterforce that pushes back on firefighters handling a hoseline is known as what?
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Nozzle reaction
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Practical working limits for velocity of fire streams are within……..
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60-120 feet per second
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Nozzle reaction for a smooth bore nozzle.
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NR= 1.57 X D2 X NP
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Why are Water curtain nozzles are rarely used?
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Because of their limited effectiveness
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Nozzle made of solid brass r steel with numerous, very small impinging holes that generally produces 1.5-3 gpm of water in very fine, misty fog cone.
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chimney nozzle
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This law states that for every action there is an equal and opposite reaction.
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Nozzle Reaction
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The limiting velocities of fire streams are produced by what PSI?
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25-100 psi
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Nozzle reaction for a fog nozzle.
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NR= 0.0505 X Q X √NP
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What nozzles does NFPA 1901 not require to be carried on apparatus, but must be decided on by the fire department based on its jurisdictional needs.
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Special Purpose Nozzles
-Cellar -Water Curtain -Piercing -Chimney |