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35 Cards in this Set
- Front
- Back
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A stream of water remains solid unless ___,___,___.
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Strikes Object; Overcome by Gravity; Changed by Friction with Air
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Define Periphery.
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Line bounding a rounded surface; Outward boundary of object distinguished from its internal regions.
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Define Deflection.
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Turning from straightline or given course.
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Define Impinge.
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To strike against.
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What determines the pattern of a Periphery Deflected Nozzle?
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Position of Deflecting Stem and Exterior Barrel
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What determines the pattern of an Impinging Nozzle?
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Several jets of water are driven together at an angle to break water into fine particles.
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What is the diffence between a Monitor and Deluge?
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Monitor stream direction and angle can be changed while discharging water; Deluge cannot be adjusted while discharging water.
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What are 2 types of Elevated Master Streams?
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Detachable and Pre-piped.
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Why is a Water Curtain ineffective at protecting exposures?
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Water Curtain only absorbs Convected Heat, Not Radiated Heat.
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How many firefighters are needed to place a Piercing Nozzle in service>?
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2; 1 with Nozzle and 1 with Sledge
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What is the Solid Stream Nozzle Reaction Formula?
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NR = 1.57 x d2 x NP
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What is the Fog Stream Nozzle Reaction Formula?
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NR = .0505 x Q x √NP; Q = Total Flow through Nozzle in GPM
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What is the Nozzle Pressure for a Solid Stream Handline?
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50 PSI
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What is the Nozzle Pressure for a Solid Stream Masterstream?
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80 PSI
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What is the Nozzle Pressure for a Fog Nozzle?
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100 PSI
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What is the Maximum GPM allowed on Handline?
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350 GPM
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What limits the amount of Nozzle Pressure that can be applied to an Attack Line?
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Nozzle Reaction
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Define Nozzle Reaction.
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Counterforce directed against firefighter holding nozzle from velocity of water being discharged.
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What is the Firegroung Fog Stream Nozzle Reaction Formula?
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NR = Q / 2; Q = Total Flow through Nozzle in GPM
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Define Fire Stream.
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Stream of water/extinguishing agent from point it leaves nozzle until it reaches desired point.
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What influences the stream at the Point of Discharge?
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Operating Pressure; Nozzle Design; Nozzle Adjustment; Condition of Nozzle
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What influences the stream as it passes through space?
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Velocity; Gravity; Wind; Friction with Air
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Name 3 types of Fire Streams.
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Solid; Fog; Broken
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Define Solid Stream.
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Compact stream with little shower or spray produced from Fixed Orifice, Smoothbore Nozzle.
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What is the GPM Formula?
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29.7 x d2 x √NP
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What is √50?
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7.07
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What is √80?
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8.94
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Define Fog Stream.
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Water stream of finely divided particles.
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Reach of Fog Stream depends on ___, ___, ___.
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Width of Stream; Size of Droplets; Amount of Water Flowing
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Name 4 types of Fog Nozzles.
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Constant Flow; Manually Adjustable Gallonage; Automatic; High Pressure
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What are 3 reason to use a Master Stream?
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Handlines ineffective; Conditions usafe; Manpower limited
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Name 4 categories of Master Stream Devices.
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Monitor; Deluge Set; Turret Pipe (Deck Gun); Elevated Masterstream
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Name 3 types of Monitors.
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Fixed; Portible; Combination
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Name 4 types of Broken Stream Nozzles.
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Distributors; Water Curtain; Piercing; Chimney
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Define Broken Stream.
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Water broken into coarsley divided drops.
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