Flow Loss Nomograph

Williams-Hazen formula · C = 150 (thermoplastic pipe)

GPM
PSI/100ft: 6.665 · Velocity: 7.34 ft/sec ⚠ high velocity
GPM I.D. (in.) PSI / 100 ft 1 2 5 10 20 50 100 200 300 0.5 1.0 1.5 2.0 2.5 3.0 0.01 0.05 0.1 0.5 1 5 10 20 6.665
DR-9 · 250 PSI · 1-1/4" · 30 GPM

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.