Hazen-Williams Coefficients Table

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Hazen-Williams Coefficients Table

Fluids Flow Engineering | Hydraulic & Pneumatic Design Engineering,

Hazen-Williams Coefficients Table

The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water . Also, it does not account for the temperature or viscosity of the water.

The following are Typical C factors used in the Hazen–Williams equation, which take into account some increase in roughness as pipe ages are as follows:

Material	Hazen-Williams (C)
ABS - Acrylonite Butadiene Styrene	130
Aluminum	130 - 150
Asbestos Cement	140
Asphalt Lining	130 - 140
Brass	130 - 140
Brick sewer	100
Cast-Iron - new unlined	130
Cast-Iron 10 years old	107 - 113
Cast-Iron 20 years old	89 - 100
Cast-Iron 30 years old	75 - 90
Cast-Iron 40 years old	64-83
Cast-Iron, asphalt coated	100
Cast-Iron, cement lined	140
Cast-Iron, bituminous lined	140
Cast-Iron, sea-coated	120
Cast-Iron, wrought plain	100
Cement lining	140
Concrete	120
Concrete lined, steel forms	140
Concrete lined, wooden forms	120
Concrete, old	100 - 110
Copper	130 - 140
Corrugated Metal Pipe	60
Ductile Iron Pipe (DIP)	140
Ductile Iron, cement lined	120
Fiber	140
Fiber Glass Pipe - FRP	150
Fire Hose (Rubber Lined)	135
Galvanized iron	120
Glass	130
Lead	130 - 140
Metal Pipes - Very to extremely smooth	130 - 140
Plastic	130 - 150
Polyethylene	140
Polyvinyl chloride, PVC, CPVC	140
Rusted Steel	140
Steel Coal-Tar Enamel Lined	145 - 150
Steel Forms	140
Steel new unlined	140 - 150
Steel, corrugated	60
Steel, welded and seamless	100
Steel, interior riveted	90-110
Steel, interior riveted, no projecting rivets	110
Steel, projecting girth and horizontal rivets	100
Steel, vitrified, spiral-riveted	90 - 110
Steel, welded and seamless	100
Tin	130
Vitrified Clay	110
Wrought iron, plain	100
Wood (well planed)	130
Wooden or Masonry Pipe - Smooth	120

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