Calculateur de Pertes de Charge par Friction Gratuit
Calculez les pertes de charge par friction dans vos canalisations. Entrez le diamètre, la longueur et le débit pour un résultat précis.
Total Head Loss
0.00 ft
Total Head Loss vs Flow Rate
Formule
## Hazen-Williams Formula **h_f = 10.67 x (Q / C)^1.852 / D^4.8655 x L** This empirical formula is widely used for water distribution systems. C is the roughness coefficient (150 for new PVC, 130 for copper, 100 for old steel). Results are in feet of head; multiply by 0.4333 for psi.
Exemple Résolu
15 GPM through 1-inch copper (C=130) for 100 feet.
- 01h_f/100ft = 10.67 x (15/130)^1.852 / (1/12)^4.8655
- 02Compute numerator and denominator using the formula
- 03Total head loss for 100 ft is approximately 12.5 ft
- 04Pressure loss = 12.5 x 0.4333 = 5.42 psi
Questions Fréquentes
What C-value should I use?
New PVC: 150, new copper: 130, new steel: 120, old cast iron: 80 to 100. Lower C values represent rougher or older pipes.
When should I use Hazen-Williams vs Darcy-Weisbach?
Hazen-Williams is simpler and widely used for water at normal temperatures. Darcy-Weisbach is more general and works for any fluid or temperature.
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