Hazen Williams C: design_NFPA13_sprinkler
Hazen-Williams roughness coefficients (C values) for pressure pipe hydraulic calculations. Covers new and aged pipe materials: ductile iron (cement-lined/unlined), cast iron at 0/5/10/20/30/40 years, carbon steel (new/corroded/lined), copper, brass, PVC, HDPE, CPVC, FRP, concrete, asbestos cement, galvanized steel, stainless steel, lead, vitrified clay. Includes AWWA M31 and NFPA 13 design C values. C value ranges (min/typical/max) and recommended design values are provided.
| pipe material | pipe condition | c value max (dimensionless) | c value min (dimensionless) | c value typical (dimensionless) | design c value (dimensionless) | notes |
|---|---|---|---|---|---|---|
| design_NFPA13_sprinkler | design_value | 140 | 100 | 120 | 120 | NFPA 13-2022 sprinkler hydraulic calculation; C=120 default for schedule 40 steel; C=150 listed for CPVC/PE-RT; Appendix A |
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