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Engineering ToolBox > Hazen-Williams Coefficients
Hazen-Williams coefficients are used in the Hazen-Williams equation for friction loss calculation in ducts and pipes. Coefficients for some common materials used in ducts and pipes can be found in the table below:
| Material | Hazen-Williams Coefficient - c - |
| Asbestos Cement | 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, wrought plain | 100 |
| Concrete | 100 - 140 |
| Copper or Brass | 130 - 140 |
| Corrugated Metal | 60 |
| Ductile Iron Pipe (DIP) | 140 |
| 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 | 150 |
| PVC, CPVC | 150 |
| Smooth Pipes | 140 |
| Steel new unlined | 140 - 150 |
| Steel | |
| Steel, welded and seamless | 100 |
| Steel, interior riveted, no projecting rivets | 100 |
| Steel, projecting girth rivets | 100 |
| Steel, vitrified, spiral-riveted | 90 - 100 |
| Steel, corrugated | 60 |
| Tin | 130 |
| Vitrified Clays | 110 |
| Wooden or Masonry Pipe - Smooth | 120 |
| Wood Stave | 110 - 120 |