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The Hazen-William equation is an empirical one. It has a proportionality constant

that depends on the use of USCS units or SI units.

For the case of USCS units, pressure drop is in 'psig', length of pipe in 'ft', volume flow in 'gpm', and inside pipe diameter in 'in'.

For the case of SI units, pressure drop in 'm', length in 'm', volume flow in 'm3/s,

and inside pipe diameter in 'm'.

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โˆ™ 2012-05-11 20:25:29
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Q: In headloss calculation using hazzen William equation does units of flow and pipe diameter are cancelled out?
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What is the Hazen Williams equation?

There are different ways of writing the hazen -william friction loss equation depending on which system of units you are working with. If you want to calculate friction loss in feet then the equation is as follows:hL = ((L)/(((6.27*10^-4)*C*D^2.63)^1.85))*Q^1.85Where:hL = Headloss (ft)L = Length of pipe (ft)C = Hazen William coefficient for the material that the pipe is made out of (unitless)D = Diameter of the pipe you are working with (in.)Q = Flow rate you are working with (cubic feet per second (cfs))


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