Hazen-Williams Flow through a Pressurized Pipe Equation

on . Posted in Fluid Dynamics

The Hazen-Williams Equation can be used for flow through an open channel or through a pressurized pipe.


Hazen-Williams flow through a pressurized pipe Equation formulas

\(\large{ p_d = \frac{4.52 \; Q^{1.852}} {C^{1.852} \; d^{4.8704}}  }\)     (US units) 

\(\large{ p_d = \frac{10.67 \; Q^{1.852}} {C^{1.852} \; d^{4.8704}}  }\)     (SI units)

Symbol English Metric
\(\large{ p_d }\) = pressure drop over the length of pipe \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ Q }\) = flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)
\(\large{ C }\) = Hazen-Williams coefficient \(\large{dimensionless}\)
\(\large{ d }\) = inside diameter of pipe \(\large{in}\) \(\large{mm}\)


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Tags: Pipe Sizing Equations Flow Equations Hazen-Williams Equations