Hazen-Williams aid tool

Everyone who deals with pipe-laying of any kind needs to calculate the friction losses. Even those who master expansive apps like IrriCAD may want sometimes to cross-check with other tools. Count those out – and you remain with thousands of end-users, project managers, and farm or plant owners who wants to review third-party designs.

My students are familiar with the joy and passion I have when we reach topic 9 discussing the pipe system calculations, but I had a secret I was hiding from them until now: When it came to Hazen-Williams I was just a user. I couldn’t calculate it myself and had to use different apps whom I could only half-way trust. I knew Reynolds number and Moody charts, but manually calculating a system with those tools is hopeless.

I decided to put an end to it, and the file in this link is the result of this study.

What will it give you?

For now this tool is only accurate for ISO 1453-2 pipes (PVC, Millimetric). Other pipes are listed, but the wall-thickness refers to this standard.

The tool is velocity-oriented: That means that once you enter your velocity policy (Advice: Do not exceed 1.7 m/s) you will see the flow (in m3/h) at that velocity, and the result pressure drop. You cannot type your actual flow to see the pressure drop at your own condition. To overcome this I recommend first to run your Max-velocity, and then play with it until you see your real flow in B10.

I hope as many as possible of you will find this tool helpful. I will be grateful for any comment in the LinkedIn feed or by email.

Joseph Livne

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