As a result it is extremely important to be able to demonstrate competence when assigning a risk rating to a water system. All of Aqua Legion UK Ltd risk assessors are competent to conduct risk assessments on the buildings they are assigned to manage. Our ACOP L8 legionella risk assessments and commitment to BS ensures the risk rating is derived by assessing the following:- The actual and potential risk for Legionella bacteria to colonise and proliferate in the system. The actual and potential risk for the Legionella to be disseminated in an aerosol form. The actual and potential risk for susceptible individuals to be exposed. Further to this, the effectiveness of the control and preventative measures in place are assessed along with the effects of out of line situations on the risk levels, the management structure and communication structure as minimum.
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Why are hot and cold water temperatures important? Legionellosis is a condition caused by Legionella bacteria, and it affects the respiratory system. It is usually caught by breathing in small droplets of contaminated water. Legionella bacteria can spread in man-made hot and cold water systems if the water temperature allows this to happen.
The prime temperature for the bacteria to proliferate at is between 20 — 45 degrees Celsius F. How to check water temperatures Hot and cold water temperatures should be checked monthly at various points throughout the water system. These temperatures should then be recorded so they can be monitored over time to help improve the management of legionella risks and the control processes in place.
These records should be kept safely for at least five years. Checking the temperature from the hot taps Using an accurate thermometer, check the water flow from a chosen hot tap. Other representative points can then also be checked in a chosen pattern, eventually repeating the pattern so different taps are checked monthly.
Here are the main points to note: Hold the thermometer in the hot water flow for one minute Record the temperature on the thermometer It should be a minimum of 50 degrees Celsius after one minute If it is below this, advise whoever oversees the site so the necessary actions can be taken to remedy the issue If thermostatic mixing valves TMVs are fitted, these ensure the temperature never exceeds 44 degrees Celsius primarily to prevent hot water scalding.
In this case, the hot water inlet to the TMV should be checked instead of the hot taps. Again, a minimum of 50 degrees Celsius should be recorded in this instance. With a TMV fitted water temperatures at the hot tap should not exceed 44 degrees Celsius. Checking the temperature from water heaters calorifiers On a monthly basis check the water flow and return temperatures at water heaters calorifiers.
One way of measuring these temperatures is to use a surface temperature probe. Temperatures from cold taps A similar pattern should be followed to that described for hot water above. Formulate a pattern for rotating through different cold taps each month: Hold the thermometer in the cold water flow for two minutes Record the temperature after two minutes It should be a maximum of 20 degrees Celsius or below Report and action as above if it goes above this Other water checks to make Make a monthly check of water temperatures of the flow and return from and to the calorifier see above.
Every six months, you must also check the water temperature in the cold water storage tank: Check temperature at ball valve Check mains water temperature going into the tank Confirm and record temperatures as shown on the thermometer on the tank, if it has one Keeping accurate records is of paramount importance. Make sure it is clear which taps or tanks were checked each time, where they are, who checked them, when they were checked, and anything that was amiss and what was done to remedy it. Practical workshop training for routine legionella monitoring tasks To help people involved in the routine monitoring and maintenance of water systems we offer a practical legionella training course designed specifically for those who want to learn how to perform various monitoring and maintenance tasks required as part of an ACOP L8 legionella control and compliance programme … Ensure you take and record water temperatures corrrectly with our Practical ACOP L8 Course This course is ideal for facilities managers, caretakers, building managers, plumbers, maintenance and engineering contractors… in fact anyone with responsibility for the monitoring, inspection and maintenance of hot and cold water systems.
Legionella and Legionnaires' disease
By continuing to browse this site, you give consent for cookies to be used. Each asset has a monitoring schedule PPM , each PPM has specific testing requirements, each test has control limits and out of specification results produce non-conformities. Fail safe control. Held in the cloud our system allows access for consultants, service providers and building operators allowing effective co-operation and tight control.
Legionnaires' disease. The control of legionella bacteria in water systems
Why are hot and cold water temperatures important? Legionellosis is a condition caused by Legionella bacteria, and it affects the respiratory system. It is usually caught by breathing in small droplets of contaminated water. Legionella bacteria can spread in man-made hot and cold water systems if the water temperature allows this to happen. The prime temperature for the bacteria to proliferate at is between 20 — 45 degrees Celsius F. How to check water temperatures Hot and cold water temperatures should be checked monthly at various points throughout the water system.
How to Check Water Temperatures to Minimise the Risk of Legionella Bacteria
Heat[ edit ] The more expensive[ citation needed ] of these two options is temperature control—i. The high cost incurred with this method arises from the extensive retrofitting required for existing complex distribution systems in large facilities and the energy cost of chilling or heating the water and maintaining the required temperatures at all times and at all distal points within the system. For systems with marginal issues, chlorine provides effective results at 0. For systems with significant Legionella problems, temporary shock chlorination—where levels are raised to higher than 2 ppm for a period of 24 hours or more and then returned to 0. The system is then flushed and returned to 0. These high levels of chlorine penetrate biofilm, killing both the Legionella bacteria and the host organisms. Annual hyperchlorination can be an effective part of a comprehensive Legionella preventive action plan.
ACOP L8 Legionella Risk Assessment services