PVC Pipe Schedule 40 - Friction loss and Velocity Diagram

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The diagram below indicates 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 62^oF (16.7^oC) = 703.1 mm H₂O at 62^oF (16.7^oC) = 2.0416 in mercury at 62^oF (16.7^oC) = 51.8 mm mercury at 62^oF (16.7^oC) = 703.6 kg/m² = 2.307 Ft. H₂O

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Related Topics

• Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
• Water Systems - Hot and cold water systems - design properties, capacities, sizing and more

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