Fluid Flow Friction Loss - Hazen-Williams Coefficients
Hazen-Williams friction loss coefficients for commonly used piping materials.
Hazen-Williams coefficients are used in the Hazen-Williams equation calculate friction loss in ducts and pipes. Coefficients for some common materials used in ducts and pipes are indicated below:
Material | Hazen-Williams Coefficient - c - |
---|---|
ABS - Acrylonite Butadiene Styrene | 130 |
Aluminum | 130 - 150 |
Asbestos Cement | 140 |
Asphalt Lining | 130 - 140 |
Brass | 130 - 140 |
Brick sewer | 90 - 100 |
Cast-Iron - new unlined (CIP) | 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 | 130 - 140 |
Concrete | 100 - 140 |
Concrete lined, steel forms | 140 |
Concrete lined, wooden forms | 120 |
Concrete, old | 100 - 110 |
Copper | 130 - 140 |
Corrugated Metal | 60 |
Ductile Iron Pipe (DIP) | 140 |
Ductile Iron, cement lined | 120 |
Fiber | 140 |
Fiber Glass Pipe - FRP | 150 |
Galvanized iron | 120 |
Glass | 130 |
Lead | 130 - 140 |
Metal Pipes - Very to extremely smooth | 130 - 140 |
Plastic | 130 - 150 |
Polyethylene, PE, PEH | 140 |
Polyvinyl chloride, PVC, CPVC | 150 |
Smooth Pipes | 140 |
Steel new unlined | 140 - 150 |
Steel, corrugated | 60 |
Steel, welded and seamless | 100 |
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 |
Wooden or Masonry Pipe - Smooth | 120 |
Wood Stave | 110 - 120 |