Hazen-Williams Calculator

Flow Rate (Q, in gallons per minute): Hazen-Williams Coefficient (C):

Select Material Black steel (wet systems including deluge) — C = 120 Black steel (dry systems including preaction) — C = 100 Galvanized steel (wet systems including deluge) — C = 120 Galvanized steel (dry systems including preaction) — C = 100 Copper tube, brass or stainless steel — C = 150 Plastic (listed) all — C = 150 Cement-lined cast- or ductile iron — C = 140 Unlined cast or ductile iron — C = 100 Asbestos cement — C = 140 Concrete — C = 140

Pipe Inner Diameter (d, in inches): Calculate

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