Calculators

Darcy-Weisbach Formula for Friction Loss

HL = f v²/2 g D, where
Re = Reynolds number:
F = friction factor (f=64/Re):
V = water velocity (Ft/Sec):
G = gravitational constant (Ft/Sec^2):
D = pipe diameter (Ft):
HL = friction loss (Ft):

Hazen-Williams Formula for Pressure Loss
(in SI units)

P = 10⁵ (6.05) Q^1.85/C^1.85 D^4.87, where
Q = flow rate (Litre/Min)
C = friction factor of pipe (constant):
D = internal diameter of pipe (mm):
P = pressure loss (bars) per lineal feet:

Pressure Tank Sizing (Tank above sprinklers)

Pressure Velocity

General Volumetric Flow Rate

Hazen-Williams Formula for Pressure Loss

P = 4.52 Q^1.85/C^1.85 D^4.87, where:

Q = flow rate (GPM)

C = friction factor of pipe (constant):
Typical C Values, Click to Show/Select

D = internal diameter of pipe (inches):

P = pressure loss (PSI) per lineal ft.:

Pressure Tank Sizing (Tank below sprinklers):

Simple Flow Rate: