Calculate pipe losses

Construction & Crafts
96 calculations
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📝 How it works:
Calculate pressure losses in pipes based on flow rate, length and material. For plumbing and heating installations.

Fill in the fields below and click "Calculate".

Pipe losses: Pressure loss in sanitary pipes

Calculate pressure losses in water pipes for plumbing and heating:

  • Pipe friction: Losses due to flow resistance
  • Pipe length & diameter: Most important parameters
  • Volume flow: liters/minute flow rate
  • Material: copper, plastic, steel (roughness)
  • Fittings: Valves, elbows, T-pieces increase loss

Guideline values for pressure loss:

  • DN 15 (½"): approx. 0.3 bar/m at 10 L/min
  • DN 20 (¾"): approx. 0.08 bar/m at 10 L/min
  • DN 25 (1"): approx. 0.03 bar/m at 10 L/min

Example: 20m pipe DN 20, 15 L/min: Pressure loss approx. 2.4 bar. With an inlet pressure of 4 bar, 1.6 bar remains at the outlet

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Minimum pressure: tap 0.5 bar, shower 1 bar, washing machine 1 bar. If the pressure is too low: choose a larger diameter.

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