Pressure drop in pipe using the Hazen-Williams empirical formula. Applicable to water systems at ambient temperatures, 40°F to 75°F. The pipe material sets the roughness coefficient C.
Inputs
gpm
in
ft
Hazen-Williams is most accurate for water in pipe larger than 2 inches. For smaller diameters or fluids other than water, use the Darcy-Weisbach pressure drop calculator instead.
Result
0ft H₂Ototal head loss
.
Loss per 100 ft0 ft
Pressure drop0 psi
Velocity0 ft/s
C used150
Formula appliedhf = 0.002083 · L · (100/C)1.852 · Q1.852 / d4.8655 | V = 0.4085·Q / d² | psi = hf · 0.4335 | Q in gpm, d in inches, L in ft
