Free Head Loss Calculator
Calculate friction head loss in a pipe using the Darcy-Weisbach equation.
m
mm
m/s
Friction Head Loss
4.08 m
Pressure Drop40.0 kPa
Friction Head Loss vs Darcy Friction Factor (f)
Darcy-Weisbach Head Loss
Friction between the fluid and the pipe wall converts kinetic energy into heat, causing a pressure drop along the pipe.
Formula
h_f = f (L/D) (V^2 / 2g)
where f is the Darcy friction factor (from Moody chart or Colebrook equation), L is pipe length, D is pipe diameter, V is flow velocity, and g is gravitational acceleration (9.81 m/s^2).
Example Calculation
Water at 2 m/s in a 100 mm pipe, 100 m long, with f = 0.02.
- 01D = 0.1 m
- 02V^2 / 2g = 4 / 19.62 = 0.2039 m
- 03h_f = 0.02 x (100/0.1) x 0.2039 = 0.02 x 1000 x 0.2039 = 4.08 m
- 04Pressure drop = 1000 x 9.81 x 4.08 / 1000 = 40.0 kPa
Frequently Asked Questions
Learn More
Beam Stress Calculation Guide: From Theory to Practice
Learn how to calculate beam stress step by step. Covers bending stress, shear stress, the flexure formula, stress distributions, and practical design checks for structural beams.