Pressure, flow and system types
PRO · 30 minutes · Design and fault-find a domestic system.
Answer by: Type. You can change method or take a break at any time.
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Our learning goal
Design and fault-find a domestic system.
Your turn: Choose one thing you would like to understand by the end.
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My lesson notes & project
Full teaching script
- Today: Pressure, flow and system types. Our goal: Design and fault-find a domestic system.
- Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
- Head gives pressure: roughly 0.1 bar per metre of height. A gravity-fed system depends on cistern height, so a shower on the top floor is always weak. Unvented and combi systems run at mains pressure — better flow but subject to mains rate and needing safety devices (expansion vessel, PRV, T&P valve) that must be serviced. Air locks form at high points, so pipework is graded and vented; water hammer comes from fast-closing valves and is cured with an arrestor, not a bigger clip.
- Together: choose one example from the explanation and show how it works. What do you notice?
- Your turn: Measure the flow rate at a tap in litres per minute and judge the shower it can feed.
- Reflect: what made sense, and what would you like explained differently?
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