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Hazen Williams Formula

pressure drop hazen williams pipe roughness

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#1 Sherif Morsi

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Posted 19 June 2017 - 04:14 PM



I am currently verifying a line size for the replacement of a hot seawater line operating at 8 barg and 65 C. We are using an Elastopipe with a hazen Williams C-factor of 130. Using the Hazen-Williams equation has some disadvantage in my case given that the temperature is outside the applicable range of the equation (up to 24 C).


If the vendor doesn't provide a roughness value, Is there a way to calculate it using the C-factor?




#2 Bobby Strain

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Posted 19 June 2017 - 06:56 PM

Here is the formula.  http://www.engineeri...ater-d_797.html

Calculate the friction factor that gives you the same head loss as Hazen-Williams. Then you can determine the roughness that produces that friction factor. Nothing magic about the temperature.



#3 spchauhan12


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Posted 20 June 2017 - 12:53 AM

For water system, you may use C - Factor as 120 (Refer attached cal. done by me for my previous project for Fire water Line Sizing)

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#4 Bobby Strain

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Posted 21 June 2017 - 03:15 PM

Check this.




#5 mwyou


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Posted 29 June 2017 - 09:53 AM

C value changed based on pipe material.

You can find lots detail engineering tools in






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