Chapter 6 - Hoze Nozzles and Flow Rates Flashcards
__________, ________ and _______, as well as ___________ affect the condition of the stream as it leaves the nozzle.
Operating Pressure
Nozzle Design and Adjustment
Condition of the Nozzle Orifice
The fire service operates three types of nozzle to produce three basic fire streams:
Solid, Fog, and Broke Stream
A _________ is produced with a fixed orifice and a smooth bore nozzle.
Solid Fire stream
Solid stream nozzles on handlines should generally be operated at a maximum of ___ psi nozzle pressure, while master stream appliances should be operated at a maximum ___ psi.
50 psi
80 psi
Formula to determine the flow of a solid stream nozzle.
GPM = 29.7 x d² x √NP
The reach of the fog stream is directly related to _______, __________, _____, and __________.
Its width
The size of the water droplets
The wind
The volume of water flowing
Most constant flow nozzles are designed to operate at a nozzle pressure of ___ psi. However, some nozzles may operate at __ or __ psi.
100 psi
50 or 75 psi.
The three basic types of master stream appliances are _____, _______, and _______.
Fixed
Combination
Portable
________ are most often lowered through holes or other openings to the cellar of an occupancy.
Cellar Nozzle (distributors)
_________ are commonly used in aircraft firefighting, car fires, or to apply water to voids, attics, or other areas inaccessible to standard fire streams.
Piercing nozzles (Penetrating nozzle)
Formula to determine nozzle reaction for solid stream nozzles.
NR = 1.57 x d² x NP
simply
NR = Q/3
Q = total flow through the nozzle in gpm.
Formula to determine nozzle reaction for fog nozzles.
NR = 0.0505 x Q x √NP
simply
NR = Q/2
Q = total flow through the nozzle in gpm.
