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Legionella Control (HSE)
Temperature control is the primary method used to control the risk from Legionella.
Water services must be managed and controlled at suitable temperatures that will prevent Legionella Proliferation (growth) such as:
- Hot water storage cylinders (calorifiers) should store water at 60°C or higher
- Hot water should be distributed at 50°C or higher
- Cold water should be stored and distributed below 20°C.
- Thermostatic mixer valves (TMV) need to be fitted within 1.5 metres of the outlet it supplies.
Your Legionella Control (HSE) manager should frequently inspect, monitor and maintain the water system, in accordance with the site risk assessment.
Sentinel outlets (nearest and furthest to stored hot and/or cold water) should be identified so that monthly checks of distribution temperatures can be carried out. Stored hot water temperatures should also be checked and reviewed every month and stored cold water tank temperatures at least every six months.
As stagnant water provide Legionella bacteria an ideal environment for growth, dead legs/dead ends in pipe-work should be removed. Infrequently used outlets, (especially aerosol generating outlets such as showerheads) should be flushed on a weekly basis. All outlets that generate a spray (showers and spray taps) should be cleaned and descaled on a quarterly basis. Cold-water storage tanks should be cleaned periodically and all water should be drained from hot water cylinders to check for debris or corrosion.
Water sample analysis can be used as an additional control method for systems that are presenting temperatures out with the control parameters.
What is portable appliance testing?
Portable appliance testing (PAT) is the term used to describe the examination of electrical appliances and equipment to ensure they are safe to use. Most electrical safety defects can be found by visual examination but some types of defect can only be found by testing. However, it is essential to understand that visual examination is an essential part of the process because some types of electrical safety defect can’t be detected by testing alone.
A relatively brief user check (based upon simple training and perhaps assisted by the use of a brief checklist) can be a very useful part of any electrical maintenance regime. However, more formal visual inspection and testing by a competent person may also be required at appropriate intervals, depending upon the type of equipment and the environment in which it is usedfind out more