Legionnaires Disease

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Nemco are Risk assessment consultants offering a systematic method of Risk Management Consultants and Services across the UK for the prevention and control of risks by fire, air and waterborne pathogens.

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Legionnaires Disease

  1. 1. - By Nemco Utilities (www.nemco-utilities.co.uk)
  2. 2. <ul><li>Taking cooling tower and evaporative condensers aside, a large proportion of Legionella problems relating to domestic water systems stem from hot water cylinders. Granted, it tends to be showers that actually create the fine mist or spray that transmit the bacteria but the source of the bacteria seem largely to come from stored hot water. One of the principal reasons for this is the apparent conflict between two separate bits of guidance; the Legionella guidance (ACOP L8) and the Anti-Scalding regulations. </li></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  3. 3. For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  4. 4. <ul><ul><li>The Anti Scalding regs state that where vulnerable people have access to the water services (e.g. nursery or healthcare setting) then 50  C would be deemed at scald risk and water should not be supplied outside the range of 39 - 43  C. On the face of it this would present a problem, the ideal solution is that the water is stored at 60  C and reached the point of use at 50  C but is blended down, by means of a thermostatic mixer valve (TMV) or blender tap, to a useable temperature. </li></ul></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  5. 5. <ul><ul><li>However, this is fine for new builds / refurbishments, but to retro fit TMVs can be a very costly and time consuming exercise with a number of organisations preferring to turn the hot water cylinder itself down to around 40  C. This then provides water at a useable temperature for washing etc but the whole hot water system then falls within the ideal range for bacterial growth. </li></ul></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  6. 6. <ul><li>One additional problem with TMVs is that of correct installation, having been given the advice that these valves need fitting, it is not uncommon for one central blending valve to be installed in the plant room or one valve used to serve the whole wing of a building. ACOP L8 states that TMVs should be installed ‘as close to the point of use as possible’ essentially to avoid long runs of pipe with water at non-compliant temperatures, but unfortunately does not give a definitive distance. </li></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  7. 7. <ul><li>TMVs are becoming more and more common, with talk of them becoming compulsory in the Building Regs, but there has been increasing evidence of Legionella colonization downstream of TMVs. This combined with vulnerable people is not ideal. </li></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk
  8. 8. <ul><li>[email_address] </li></ul><ul><li>[email_address] </li></ul><ul><li>[email_address] </li></ul><ul><li>Website: http://www.nemco-Sutilities.co.uk/ </li></ul><ul><li>Nemco Utilities Ltd </li></ul><ul><li>12 Kempson Way </li></ul><ul><li>Hillside Business Park </li></ul><ul><li>Bury St Edmunds </li></ul><ul><li>Suffolk </li></ul><ul><li>IP32 7EA </li></ul><ul><li>Telephone: </li></ul><ul><li>01284 724503 </li></ul><ul><li>Fax No: 01284 724826 </li></ul>For more information regarding TMVs or Legionella Management in general please call us on 01284 724 503 or visit our website www.nemco-utilities.co.uk

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