Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
5.865
Velocity (ft/sec)
6.85
⚠ Velocities over 5 ft/sec should be selected with caution.
DR-9 · 250 PSI · 1-1/4" · 28 GPM
DR-9 · 250 PSI · 1-1/4" · I.D. 1.292" · 28 GPM · 5.865 PSI Loss per 100 ft · 6.85 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.