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bms:bestpractice:water:legionella
Approved
2022/02/09 19:12
by mk
(version: 2)
Table of Contents
Legionnaires' disease
Legionnaires' (LEE-juh-nares) disease is a serious type of pneumonia (lung infection) caused by Legionella (LEE-juh-nell-a) bacteria. People can get sick when they breathe in small droplets of water or accidently swallow water containing Legionella into the lungs.
Dokumentation
Reading material
From the Danish “Teknologisk Institut” I have this description (In Danish, anything similar in English would be much appreciated)
And also a smaller brochure.
Tables
What we can use from theese is a table that very clearly describes when the legionella bacteria dies.
| Temperature Celsius | The effectivenes on Legionella bacteria |
|---|---|
| Below 20 °C | Legionella will survive but would often be in hibernation |
| 20 °C - 50 °C | Legionella growth, optimum conditions is 35 °C to 46 °C |
| Above 50 °C | Legionella can survive but won't grow |
| 55 °C | Legionella dies within 5-6 hours |
| 60 °C | Legionella dies within 30 minutes, but high risc of calcium deposits in pipes |
| 66 °C | Legionella dies within 2 minutes |
Recomendations / Best Practice
Recommended operations temperature
- Minimum 50 °C
- Preferred 55 °C
- At most 60 °C
And at least a minimum of 50 °C in the entire pipe system.
Water heater
With a water heater you should raise the temperature to above 65 °C for 10 minutes weekly, and keep the temperature at
Water heater with circulation
With a water heater with circulation you should raise the temperature to above 65 °C measured in return temperature.
Cold water
At most 20 °C but recommended below 10 °C
bms/bestpractice/water/legionella.txt · Last modified: 2022/02/09 19:12 by mk
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