Calculateur de Perte de Pression d'Eau Gratuit
Calculez la perte de pression d'eau dans vos canalisations. Entrez le diamètre, la longueur et le débit pour un résultat précis.
ft
in
GPM
Chute de pression
2.70 psi
Vitesse d'écoulement4.08 ft/s
Head Loss6.22 ft
Pressure Drop vs Pipe Length
Formule
## Darcy-Weisbach Pressure Drop **h_f = f x (L / D) x (V squared / 2g)** Where f is the Darcy friction factor, L is pipe length, D is diameter, V is velocity, and g is gravitational acceleration (32.174 ft/s squared). Multiply head loss in feet by 0.4333 to convert to psi.
Exemple Résolu
100 ft of 1-inch pipe carrying 10 GPM, friction factor 0.02.
- 01D = 1/12 = 0.0833 ft
- 02Area = pi x 0.04167 squared = 0.005454 sq ft
- 03V = (10/448.831) / 0.005454 = 4.09 ft/s
- 04h_f = 0.02 x (100/0.0833) x (4.09 squared / 64.348) = 6.24 ft
- 05Pressure drop = 6.24 x 0.4333 = 2.70 psi
Questions Fréquentes
How do I find the friction factor?
Use a Moody chart or the Colebrook equation. For clean copper pipe with turbulent flow the Darcy factor is typically around 0.018 to 0.025.
What pressure drop is acceptable?
A common design limit is 4 psi per 100 feet of pipe for residential supply lines.
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