Schematic Drawings

Schematic drawings form an integral part of any prudent legionella risk management programme and are a specific requirement of the Health & Safety Executive's procedures dealing with the control of legionella bacteria in water systems.

In a legionella control context schematic drawings or simply “schematics” as they are often called are simplified but accurate diagrams that help to identify the configuration of a building services water system.

Schematic drawings are intended to be easy to read without specialised training or experience and should incorporate the important components that make-up an engineered water system, but leave out those elements that are considered to be irrelevant.

An example of a good schematic diagram would be the London Underground map.

Improved Risk Management

Legionella Control Internationals experts can create well-designed schematics in a range of electronic formats that help to create simplicity from complexity, allowing the responsible person, plant operators, facilities managers and engineers to gain a better understanding of their water systems, highlight areas of potential legionella risk, and so assist in the safe and efficient operation of the facility.

Why Have Schematics?

Schematic diagrams form an integral part of any prudent legionella risk management programme and are required by the Health & Safety Executive and other key codes of practice.

Carrying out a risk assessment

"As part of the risk assessment, take into account the individual nature of each site and consider the system as a whole and not, eg the cooling tower in isolation. In complex systems, a site survey of all the water systems should be carried out, including an asset register of all associated plant, pumps, strainers and other relevant items. This should include an up-to-date schematic diagram showing the layout of the plant or system, including parts temporarily out of use."

Paragraph 38. Health & Safety Executive Approved Code of Practice and guidance L8 "Legionnaires' disease. The control of legionella bacteria in water systems"

Relevant Legislation & Codes of Practice

  • Health & Safety Executive Approved Code of Practice and guidance on regulations (ACOP) L8, “Legionnaires’ disease: The control of legionella bacteria in water systems”
  • Health & Safety Executive: HSG274 Legionnaires’ disease: Technical guidance Part 1: The control of legionella bacteria in evaporative cooling systems
  • Health & Safety Executive: HSG274 Legionnaires’ disease: Technical guidance Part 2: The control of legionella bacteria in hot and cold water systems
  • Health & Safety Executive: HSG274 Legionnaires’ disease: Technical guidance Part 3: The control of legionella bacteria in other risk systems
  • Department of Health: Health Technical Memorandum (HTM) 04-01: The control of Legionella, hygiene, “safe” hot water, cold water and drinking water systems Part A: Design, installation and testing
  • Department of Health: Health Technical Memorandum (HTM) 04-01: The control of Legionella, hygiene, “safe” hot water, cold water and drinking water systems Part B: Operational management
  • BS 8580:2010 “Water Quality – Risk assessments for Legionella control – Code of practice”

Preparation of Schematics

Our specialist teams are expert in the preparation of high quality schematic diagrams in a variety of electronic design formats that can be used to improve on-site risk management, safety engineering and document control procedures.

Expert Assistance

For further information and specialist assistance regarding the preparation of schematic drawings please call +44 (0) 161 877 0586 to speak to one of our specialists or email your questions to This email address is being protected from spambots. You need JavaScript enabled to view it..

Get in touch...

Legionella Control International
Unit B Badex Building
Westbrook Park
Manchester M17 1AY
United Kingdom

Manchester: +44 (0) 161 877 05 86
London: +44 (0) 203 637 47 48
Email: info@legionellacontrol.com

Eliminate uncertainty, mitigate your risk now…

Contact Us Today

Legionella Control International is trusted by clients worldwide...