Calculating pressure and flow requirements – Part 2
Lloyd Preston
31 October 2019
In this 60-second knowledge booster video, Frazer Ross discusses the calculation of water pressure and flow rates in plumbing systems and highlights the importance of using professional guides and resources, which assist in determining design flow rates while accounting for probable simultaneous demand.
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Hello, I’m Frazer Ross, and in this week’s knowledge booster video I’m talking about calculating the pressure requirement. Having determined how much water we need, we need to then determine at what pressure we need to supply it at. This is made up of three things: Static head, the pipework friction loss, and a
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discharge pressure required at the fitting. Static head is the height difference between the water source and the highest outlet in a building. Imagine a tube or riser full of water, the weight of the water and the riser due to gravity at this point deserts exerts a pressure. It has to be overcome
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before we get water at the top. The pipework friction loss is the hydraulic loss from getting water from point A through the system to point B, and the discharge pressure is the pressure required at the fitting tap or showerhead in order for it to function properly.
