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The Hazen–Williams equation is an empirical formula which calculates pressure drop of water in circular pipes caused by friction. It is used in the design of water pipe systems such as fire sprinkler systems, water supply networks, and irrigation systems. 

The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number, but it has the disadvantage that it is only valid for water. 

Input parameters are flow, pipe diameter, lenght of pipe and C is a roughness coefficient, known as William Hazens coefficient, with values ​​between 90 (more rough pipes) and 140 (smooth pipes, ex PVC). 

You can select between imperial (U.S. customary units) and metric unit (International System of Units).

If you want to take into account the pressure loss in fittings and valves, and the selection coefficient C for each material, then find our version of the application pro at https://play.google.com/store/apps/details?id=com.transparentblue.headlossplus

</div> <div jsname="WJz9Hc" style="display:none">Persamaan Hazen-Williams adalah formula empirik yang mengira kejatuhan tekanan air di dalam paip bulat disebabkan oleh geseran. Ia digunakan dalam reka bentuk sistem paip air seperti sistem pemercik api, rangkaian bekalan air dan sistem pengairan.

Persamaan Hazen-Williams mempunyai kelebihan bahawa pekali C bukan fungsi nombor Reynolds, tetapi ia mempunyai kelemahan bahawa ia adalah hanya sah untuk air.

Parameter masukan aliran, diameter paip, lenght paip dan C ialah pekali kekasaran, yang dikenali sebagai William pekali Hazens, dengan nilai antara 90 (paip lebih kasar) dan 140 (paip lancar, bekas PVC).

Anda boleh memilih antara imperial (unit adat AS) dan unit metrik (Sistem Unit Antarabangsa).

Jika anda mahu mengambil kira pengurangan tekanan dalam kelengkapan dan injap, dan pekali C pemilihan bagi setiap bahan, kemudian mencari versi kami pro permohonan di https://play.google.com/store/apps/details?id = com.transparentblue.headlossplus</div> <div class="show-more-end">

Water Headloss Calculator

Versi Terkini Water Headloss Calculator