Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
3.731
Velocity (ft/sec)
5.54
⚠ Velocities over 5 ft/sec should be selected with caution.
DR-11 · 200 PSI · 1-1/4" · 25 GPM
DR-11 · 200 PSI · 1-1/4" · I.D. 1.358" · 25 GPM · 3.731 PSI Loss per 100 ft · 5.54 ft/sec ⚠ high velocity
Values are calculated using the Williams-Hazen formula (C = 150) and are provided for reference only. Interstate Plastic, Inc. makes no warranty as to accuracy or fitness for any particular use. Consult a licensed engineer for system design.