Legionella Yearly Inspection Requirements at a Glance

HOT & COLD WATER SERVICES TEMPERATURE CONTROL REGIME

L8 STANDARDS TO BE ADHERED TO (EXTRACTED FROM ACOP L8)

Frequency

Check

Standard to meet

Notes

Weekly
Little used outlets
Flush through and purge to drain, or purge to drain immediately before use, without release of aerosols


Monthly
Sentinel Taps
The water temperature should be below 20°C after running the water for up to two minutes
The water temperature should be at least 50°C up to one minute of running the water
This check makes sure that the supply and return temperatures on each loop are unchanged, i.e. the loop is functioning as required
If fitted, input to TMV’s on a sentinel basis

The water supply to the TMV temperature should be at least 50°C within a minute of running the water
One way of measuring this is to use a surface temperature probe
Water temperatures leaving and returning to calorifier
Check Temperatures in flow and return at calorifiers
Outgoing water should be at least 60°C, return at least 50°C
If fitted, the thermometer pockets at the top of the calorifier and on the return leg are useful points for accurate temperature measurement.  If installed, these measurements could be carried out and logged by a building management system
Quarterly or as necessary
Showerheads
Dismantle, clean and descale shower heads and hoses.


Six Monthly
Incoming cold water inlet (at least once in the winter and once in summer)


The water should be below 20°C at all times

The most convenient place to measure is usually at the ball valve outlet to the cold water storage tank


Annually
Calorifiers
Visual check on internal surfaces of calorifiers for scale and sludge



Calorifiers





Cold water storage tanks
Arrange for samples to be taken from hot water calorifiers, in order to note condition of drain water

Visually inspect cold water storage tanks and carry out remedial work where necessary. Check representative taps for temperature as above on a rotational basis


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