Pressure Drop Calculator — Formula
## Pressure Drop in Pipes
Pressure drop is the energy lost to friction as fluid flows through a pipe.
### Formula
**delta_P = f (L/D) (0.5 rho V^2)**
This is the Darcy-Weisbach equation expressed in pressure units (Pa) rather than head (m). The two forms are related by delta_P = rho g h_f.
Pressure drop is the energy lost to friction as fluid flows through a pipe.
### Formula
**delta_P = f (L/D) (0.5 rho V^2)**
This is the Darcy-Weisbach equation expressed in pressure units (Pa) rather than head (m). The two forms are related by delta_P = rho g h_f.
Exemplo Resolvido
Water at 2.5 m/s through 80 mm pipe, 50 m long, f = 0.02.
- D = 0.08 m, L/D = 50/0.08 = 625
- Dynamic pressure = 0.5 x 1000 x 2.5^2 = 3125 Pa
- delta_P = 0.02 x 625 x 3125 = 39,063 Pa = 39.1 kPa
- Head loss = 39,063 / (1000 x 9.81) = 3.98 m