Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
11.082
Velocity (ft/sec)
9.97
⚠ Velocities over 5 ft/sec should be selected with caution.
DR-11 · 200 PSI · 1-1/4" · 45 GPM
DR-11 · 200 PSI · 1-1/4" · I.D. 1.358" · 45 GPM · 11.082 PSI Loss per 100 ft · 9.97 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.