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PVC Pipes Schedule 40 - Friction Loss vs. Water Flow Diagrams

Friction loss for water flow through plastic schedule 40 PVC pipe:

The calculation is based on the Hazen-Williams Equation with a Hazen-Williams coefficient c = 140.

Velocities between 7 to 10 feet per second are common. In general velocities above 5 feet per second should be avoided.

• 1 gal (US)/min =6.30888x10-5 m3/s = 0.0227 m3/h = 0.06309 dm3(litre)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min
• 1 ft/s = 0.3048 m/s
• 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC) = 2.0416 in mercury at 62oF (16.7oC) = 51.8 mm mercury at 62oF (16.7oC) = 703.6 kg/m2 = 2.307 Ft. H2O

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