Hydraulics Manual Flashcards
Formulas
What is the formula to determine GPMs of a smooth bore nozzle?
29.7D^2 sqrt(Nozzle Pressure)
What is the formula for Total Pressure Loss?
TPL = FL + AL + EL
What is the formula for Friction Loss?
FL = C(Q/100)^2*(L/100)
What are your appliance losses per the 2015 IFSTA DPO Book?
0 PSI for anything below 350
10 PSI for any appliance flowing 350 gpm or higher
25 PSI for any master stream device regardless of flow except mercury monitor
25 PSI for Aerial Devices
10 PSI for Mercury Monitor
How do you determine the elevation loss (both theoretical and fire ground)
Theoretical - EL = 0.434H
Fireground - EL = 0.5H or H/2 or (# of floors - 1) * 5
What is the formula to determine the pump discharge pressure for an attack line?
PDP = TPL + NP
What is the formula to determine the pump discharge pressure for the supply pumper?
PDP = TPL + 20
What are the coefficients for the hose lines used in Fairfax County?
1" = 150 1.75" = 10 (15.5 per IFSTA) 2" = 8 2.5" = 2 3" = 0.8 3.5" = 0.34 4" = 0.2 5" = 0.08
What is the formula to find the volume in gallons of a rectangular or square shaped pool?
LxWxHx7.5
What is the formula to find the volume in gallons of a cylinder, pipe or hose in gallons?
Pir^2H*7.5
One Cubic foot = ______ Cubic Inches.
1728 Cubic Inches
One Cubic foot contains _____ Gallons.
7.5 Gallons
One Cubic foot of water weighs _______ lbs.
62.5 lbs
One Gallon contains _______ cubic inches.
231 cubic inches
One Gallon of fresh water weights ______ lbs.
8.33 lbs
A column of water 1 foot high exerts a pressure of ________ at its base.
0.434 PSI
A 50’ section of 1.75” charged hose line contains ______ gallons of water.
6.24 Gallons
A 50’ section of 1.88” charged hose line contains _____ gallons of water.
7.2 Gallons
A 50’ section of 2.5” charged hose line contains __________ gallons of water.
12.74 Gallons
A 50’ section of 3” charged hose line contains _________ gallons of water.
18.35 Gallons
100’ section of 4” charged hose line contains _________ gallons of water.
65.25 Gallons
100’ section of 5” charged hose line contains _____________ gallons of water.
101.94 Gallons
What is the nozzle pressure for a smooth bore hand line?
50 PSI but may be increased to 65 PSI to achieve a higher flow
What is the nozzle pressure for a smooth bore master stream?
80 PSI but may be increased to 100 PSI to achieve a higher flow
What are the flow rates for a smooth bore hand lines at 50 PSI?
1/2" = 53 GPM (50 for fire ground) 7/8" = 161 GPM (150 for fire ground) 15/16" = 185 (185 for fire ground) 1" = 210 GPM (200 for fire ground) 1 1/8" = 266 GPM (250 for fire ground) 1 1/4" = 328 GPM (325 for fire ground)
What are the flow rates for a smooth bore master stream at 80 PSI?
1 1/4” = 415 GPM (400 for fire ground)
1 3/8” = 502 GPM (500 for fire ground)
1 1/2” = 598 GPM (600 for fire ground)
1 3/4” = 814 GPM (800 for fire ground)
2” = 1062 GPM (1000 for fire ground)
What is the GPM and PSI for the 1” adjustable gallonage fog nozzle?
12 to 60 GPM at 100 PSI
The non adjustable gallonage fog nozzle for the 1” lines flow ___ GPM at _____ PSI Nozzle Pressure.
22 GPM at 100 PSI
The 1 1/2” Akron Assault Nozzle flows ____ GPM at ____ PSI.
175 PSI at 50 PSI
The 2 1/2” Akron Assault Nozzle flows _____ GPM at ____ PSI.
125-250 GPMs at varying PSIs.
What are the Pump discharge pressures for your pre-connected lines?
Bumper Line - 105 PSI 200 ft. 1 3/4" Line - 135 PSI 250 ft. 1 3/4" Line - 150 PSI 300 ft 1 3/4" Line - 165 PSI 400 ft. 1 3/4" Line - 195 PSI
200 ft. 2.5” Line - 75 PSI for 250 GPM / 92 PSI for 325 GPM
What is the formula for Nozzle reaction for a smooth bore?
1.57 x D^2 x NP
What is the formula for Nozzle reaction for a fog nozzle?
0.0505 x Q x sqrt of NP
