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Hazen-Williams Flow through a Pressurized Pipe Equation

 

Hazen-Williams Flow Through a Pressurized Pipe Equation
\( p_d \;=\; \dfrac{ 4.52 \cdot Q^{1.852} }{ C^{1.852} \cdot d^{4.8704}  }\)     (US units) 
Symbol English Metric
\( p_d \) = Pressure Drop Over the Length of Pipe \(lbf\;/\;in^2\) -
\( Q \) = Flow Rate \(ft^3\;/\;sec\) -
\( C \) = Hazen-Williams Coefficient \(dimensionless\) -
\( d \) = Pipe Inside Diameter \(in\) -

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

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Hazen-Williams Flow Through a Pressurized Pipe Equation
\( p_d \;=\; \dfrac{ 10.67 \cdot Q^{1.852} }{ C^{1.852} \cdot d^{4.8704} } \)     (SI units)
Symbol English Metric
\( p_d \) = Pessure Drop Over the Length of Pipe - \(Pa\)
\( Q \) = Flow Rate - \(m^3\;/\;s\)
\( C \) = Hazen-Williams Coefficient - \(dimensionless\) 
\( d \) = Pipe Inside Diameter - \(mm\)