Friction Loss Calculator

Hazen-Williams & Darcy-Weisbach · Pump & Processing Systems

Method: Hazen-Williams Darcy-Weisbach

Flow rate

Pipe diameter

Pipe length

H-W C Factor (pipe material)

Minor losses — equiv. pipe length

Total friction loss

—

psi

Loss per 100 ft

—

psi / 100 ft

Flow velocity

—

ft/s

Calculation breakdown

Pipe diameter—

Total effective length (+ minor equiv.)—

Flow rate—

Cross-section area—

Major pipe friction loss—

Minor losses (fittings / valves)—

Velocity check—

Recommended: 2–8 ft/s for most industrial / pump piping. >10 ft/s indicates erosion risk.