Friction Loss Calculator
Williams-Hazen formula · C = 150 (thermoplastic pipe)
GPM
PSI Loss per 100 ft
3.561
Velocity (ft/sec)
4.65
SDR-9 · 250 PSI · 1-1/4" · 13 GPM
SDR-9 · 250 PSI · 1-1/4" · I.D. 1.069" · 13 GPM · 3.561 PSI Loss per 100 ft · 4.65 ft/sec
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.