Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
8.669
Velocity (ft/sec)
7.42
⚠ Velocities over 5 ft/sec should be selected with caution.
SIDR · All PSI · 1" · 20 GPM
SIDR · All PSI · 1" · I.D. 1.049" · 20 GPM · 8.669 PSI Loss per 100 ft · 7.42 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.