Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
8.910
Velocity (ft/sec)
8.86
⚠ Velocities over 5 ft/sec should be selected with caution.
DR-11 · 200 PSI · 1-1/4" · 40 GPM
DR-11 · 200 PSI · 1-1/4" · I.D. 1.358" · 40 GPM · 8.910 PSI Loss per 100 ft · 8.86 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.