Ifsta Chapter 6 Flashcards
Which of the following is not one of the three basic fire streams as defined by IFSTA?
A) broken
B) solid
C) piercing the Correct answer
D) fog
Source: IFSTA Ch. 06, Page 193, Author: Brendel
What are the two factors that determine the reach and flow of a solid stream?
nozzle pressure and size of the discharge orifice determine the flow and
reach of a solid stream.
Formula 6.1 (Customary) - Discharge Rate
GPM = 29.7 x d2 x √NP
Where: GPM = Discharge in gallons per minute (gpm)
29.7 = A constant
d= Diameter of the orifice in inches (in)
NP = Nozzle Pressure in pounds per square inch (psi)
What is considered a “narrow fog” nozzle pattern according to IFSTA?
) 15 to 45 degrees
wide fog
45-80 degrees
Which of the following is not a master stream appliance as defined by IFSTA?
A.)Fixed monitor
B.)Combination Monitor
C.) Portable Monitor
D.) Elevated Master stream
maximum flow for a handline
350 gpm
flow for a master streams
350 gpm and greater
Smooth bore master stream nozzle pressures
80 psi
Fog nozzle master stream nozzle pressures
100psi
Master Stream Appliances
Fixed Monitor, Combination monitors, Portable monitors
What is the best method to increase safety and effectiveness of a cellar nozzle?
insert an inline shutoff valve
Counterforce directed against a person holding a nozzle or a device holding a nozzle by the velocity of water being discharged.
Nozzle Reaction
Nozzle Reaction for Solid Stream Nozzles
NR = 1.57 x d2 x NP
NR = Nozzle Reaction in pounds (lb)
1.57 = A constant
d= Nozzle diameter in inches (in)
NP = Nozzle Pressure in pounds per square inch (psi)
Nozzle Reaction for Fog Stream Nozzles
NR= 0.0505 x Q x √NP
NR= Nozzle Reaction in pounds (lb)
0.0505 = A constant
Q= Total flow through the nozzle in gallons per minute (gpm)
NP = Nozzle Pressure in pounds per square inch (psi)
Determine the nozzle reaction from a 1 3/4 hoseline equipped with a akron fog nozzle tip operating a nozzle at
50PSI
62.5 lbs
Determine the nozzle reaction of a hoseline with a fog nozzle flowing 200 gpm and 100 psi.
101 lb
which nozzle type allows the firefighter operating the hoseline to select the flow rate?
selectable gallonage nozzle
MOST fog nozzles are designed to be operated at:
100 psi
Automatic nozzles are categorized as what kind of nozzle?
) variable flow nozzle
