Hazen-Williams Head Loss due to Friction

on . Posted in Fluid Dynamics

This head loss due to friction formula is used in Hazen-Williams equations.

 

Hazen-Williams Head Loss due to Friction formulas

\( h_f =  4.73\; l_p \; ( Q\;/\;C) ^{1.852} \;/\; d^{4.87}  \)     (US units)

\( h_f =  [\;4.73  ( Q\;/\;C)^{1.852}\;]  \;( l_p\;/\;d^{4.87} )   \)     (US units)

\( h_f = [\;10.7  ( Q\;/\;C)^{1.852}\;]  \;( l_p\;/\;d^{4.87} )   \)     (SI units)

Symbol English Metric
\( h_f \) = head loss due to friction \(ft\)  \(m\) 
\( Q \) = flow rate \(ft^3\;/\;sec\) \(m^3\;/\;s\)
\( C \) = Hazen-Williams coefficient \(dimensionless\)
\( l_p \) = lenght of pipe \(ft\) \(m\)
\( d \) = inside diameter of pipe \(in\) \(mm\)

 

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Tags: Pipe Sizing Head Hazen-Williams