PVC Pipe Schedule 40 - Friction loss and Velocity Diagram

Friction loss (psi/100 ft) and velocity for water flow in plastic PVC pipe schedule 40

The diagram below indicates friction loss for water flow through plastic schedule 40 PVC pipe.

Plastic Schedule 40 PVC Pipe - Friction loss and Velocity Diagram

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

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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