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<blockquote data-quote="carboneurope" data-source="post: 4829004" data-attributes="member: 81186"><p>Hi - Im Tony, and in a former life (for 12 years) I was involved in the water treatment industry specifically in the control of Legionella.</p><p></p><p><a href="http://www.hse.gov.uk/pUbns/priced/hsg274part2.pdf" target="_blank">http://www.hse.gov.uk/pUbns/priced/hsg274part2.pdf</a></p><p>Above is a link to the part of the legislation that will tell you the absolute minimum level for meeting the requirements of the legislation. Table 2.1 on pages 31-33 will tell you the maintenance and monitoring requirements.</p><p></p><p>Regarding Hot Water - the regs state it only has to be checked once a month - with the stored & flow temperatures being >60'C and the return temperature (if present) >50'C.</p><p></p><p>Depending on the temperature/stagnation etc - Legionella can proliferate a system in 2-10 days. So monthly checking is likely insufficient if there is any doubt in the system. Usually, its suggested to ensure a hot water vessel is raised to 60-65'C for atleast 1 hour daily. During this hour if there is a de-stratification pump on the system - it should be pumping water round the tank to ensure the entire volume hits 60-65'C.</p><p></p><p>As, at 60'C - the majority of the bacteria is dead within an hour (at 70'C its almost instantaneous). However, if there are deadlegs anywhere in a system where biofilm can form - temperature will not control the system by itself - and chemical/biocidal treatment will be required.</p><p></p><p>Whilst Im now involved in the selling of Activated Carbon (for Water and Air Treatment - H2S removal etc). If I can help with anything L8 wise (Legionella) - happy to point people in the right direction.</p></blockquote><p></p>
[QUOTE="carboneurope, post: 4829004, member: 81186"] Hi - Im Tony, and in a former life (for 12 years) I was involved in the water treatment industry specifically in the control of Legionella. [URL]http://www.hse.gov.uk/pUbns/priced/hsg274part2.pdf[/URL] Above is a link to the part of the legislation that will tell you the absolute minimum level for meeting the requirements of the legislation. Table 2.1 on pages 31-33 will tell you the maintenance and monitoring requirements. Regarding Hot Water - the regs state it only has to be checked once a month - with the stored & flow temperatures being >60'C and the return temperature (if present) >50'C. Depending on the temperature/stagnation etc - Legionella can proliferate a system in 2-10 days. So monthly checking is likely insufficient if there is any doubt in the system. Usually, its suggested to ensure a hot water vessel is raised to 60-65'C for atleast 1 hour daily. During this hour if there is a de-stratification pump on the system - it should be pumping water round the tank to ensure the entire volume hits 60-65'C. As, at 60'C - the majority of the bacteria is dead within an hour (at 70'C its almost instantaneous). However, if there are deadlegs anywhere in a system where biofilm can form - temperature will not control the system by itself - and chemical/biocidal treatment will be required. Whilst Im now involved in the selling of Activated Carbon (for Water and Air Treatment - H2S removal etc). If I can help with anything L8 wise (Legionella) - happy to point people in the right direction. [/QUOTE]
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