Friction Loss
FL = C � Q� � L
C - Coefficient
Q - GPM � 100
L - Length of Hose � 100
GPM for a Single Sprinkler Head
Q = �P + 15
P - Pressure in PSI
Pressure for a Single Sprinkler Head
P = (Q-15)�2
Sprinkler System Total GPM
Total GPM = (�P+15) �# of Heads�# of Minutes
P - Pressure in PSI
Nozzle Tip GPM
GPM = 29.7 � D� � ?NP
D - Diameter of Nozzle Opening
NP - Nozzle Pressure
Hydrant Opening GPM
GPM = 29.7 � D� � ?P � 0.9
D - Diameter of Nozzle Opening
NP - Nozzle Pressure
Smooth Bore Nozzle Reaction
NR = 1.57 � D� � NP
D - Diameter of Nozzle Opening
NP - Nozzle Pressure
Fog Nozzle Reaction
NR=GPM�?NP�0.0505
NP - Nozzle Pressure
Volume of a Cylinder
(ft� to Gallons)
V = 0.7854�D��L�7.481
D - Diameter
L - Length
Volume of a Cylinder
(in� to Gallons)
V = 0.7854�D��L�231
D - Diameter
L - Length
Volume of a Tank
Volume = L � W � H
L - Length
W - Width
H - Height
Cubic Feet: V ft�= V � 7.481
Cubic Inches: V in� = V � 231
Iowa Fire Flow
Iowa = L � W � H � 100
NFA Fire Flow
NFA = L � W � 3
Relay Pumping
TPDP = FL + 20
Total Pump Discharge Pressure
TPDP=FL+NP+SL�EL
FL = Friction Loss
NP = Nozzle Pressure
SL = Set Loss
EL = Elevation