Evaporative cooling water systems - Legionella Risk Assessment

The Health & Safety Executive Approved Code of Practice (ACoP) L8:2013 “Control of Legionella Bacteria in Water Systems” and supplementary guidance publications: HSG 274 Parts 1-3 relate to all commercial, industrial and municipal properties which have water systems.

Within L8 there is a requirement to carry out assessments of the risk of proliferation of Legionella in cooling tower and evaporative condenser water systems.

We have been providing assessments to premises commercial HVAC cooling and industrial process cooling for over 20 years, 
Our Risk Assessments cover:

  • Evaporative condensers.
  • Cooling towers.
  • Distribution and collection system.
  • Chillers, compressors and heat exchanges.
  • Pre-treatment plant and make up supplies.
  • Dosing & control systems.
  • Booster sets and expansion vessels.
  • Management and record keeping.

We utilise guidance from ACoP L8, HSG274 Part 1, BS 8580-1:2019, and other relevant documents relating to the control of Legionella, in our assessment & subsequent recommendations.

Schematic diagrams are frequently not available or not suitable, we can provide a schematic drawing service ideally undertaken during the assessment or available as a stand alone service.

To obtain full benefit from a Legionella Risk Assessment it is important that our staff are assisted to access all parts of the system during our visit and that your site records, schematics and asbestos register are available.

Responsibility for compliance following the Risk Assessment remains with the Responsible Competent Person who needs to review it, implement recommendation and undertake routine preventative procedures. Risk Assessments are recommended to be reviewed normally at least every two years (based on the old ACoP guidance) but they should also be updated if there are significant system or other changes.

Fundamentally the objectives of our Legionella risk assessments are:

  1. To establish the current position regarding water service condition.
  2. To establish a record of plant data.
  3. To identify areas where modifications or adjustments may be required from a water quality and/or safety point of view.
  4. To establish a programme for compliance with HSG 274 the Control of Legionellosis including Legionnaires Disease.
Evaporative cooling water systems

Verification of Controls

HSG 274 Part 1 recommends bacterial, Total Viable Count (TVC) and Legionella, sampling on a regular basis based on typical guidance frquencies and the outcome of the Legionella risk assessment.

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