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VDI 2047-2
Answers to the most important questions

When did the new VDI 2047 Sheet 2 standard come into force?

  • VDI 2047 Sheet 2 became legally binding like a DIN standard on 01/01/2015 as a recognised rule of technology.

What does this entail for all cooling tower operators?

  • Perform trainings for all employees working in the cooling tower.
  • Periodically inspect all cooling systems on a monthly basis with laboratory analysis and microbiological assays.
  • Perform legionella hygiene analysis every quarter.
  • Test for pseudomonas every quarter.
  • Perform a hazard assessment for every single cooling system.

Who needs to complete a VDI 2047 Sheet 2 training?

  • This is what VDI says in Item 10.1: Due to the significance of the requirements resulting from this standard, the employees responsible for and/or tasked with performing the work are to be qualified in trainings for their tasks.
  • Anyone in charge of construction, upkeep and/or maintenance of evaporative cooling plants
  • Planners, plant manufacturers, service providers
  • Facility managers
  • Specialist companies for cooling water treatment, cleaning and disinfection, maintenance and upkeep

What is part of a VDI 2047-2 training?

  • Introduction to VDI 2047 Sheet 2;
  • Layout and functional operation of evaporative cooling plants;
  • Relevant basic principles of microbiology, occurrence and risks from legionella, medical aspects;
  • Relevant basic principles of water chemistry and corrosion processes;
  • Monitoring of systems;
    • Checking chemical and physical characteristics;
    • Microbiological assays and sampling;
    • Checking the use of biocides;
  • Upkeep of systems, including disinfection;
  • Authoritative laws, regulations and other technical rules.

Who may conduct a VDI 2047-2 training?

  • We are a VDI-GBG training partner with five accredited instructors.

What do I receive with the training?

  • All training participants receive qualified documents that we are obligated to purchase from VDI as their training partner. These are obligatory. We are not allowed to issue a training certificate without these documents.
  • A personal copy of the 2047-2 standard (original version, worth €130) with Annex VDI 4250 (environmental-medical assessment of bioaerosol immissions, worth €80, directly from the Beuth publishing house);
  • Workshop documents;
  • Original VDI certificate (after successful exam);
  • Catering.

What does the hazard assessment contain?

  • A hazard assessment consists of a risk analysis and a risk assessment. Both may only be conducted by individuals trained in VDI 2047 Sheet 2. The objective is to run an evaporative cooling plant with the lowest possible hygiene risk.

What are the objectives of a risk assessment?

  • Stocktaking of systems engineering and maintenance quality; identifying any resulting hazards or other hygiene-relevant downfalls;
  • Assessing noxious risks caused by existing system vulnerabilities;
  • Suggesting and prioritising measures for remedying the cause of the infestation.

Which chemical parameters must be tested, and how often?

  • All the material present in the system must be taken into consideration.
  • Check the following parameters at least monthly: Conductivity (every fortnight), pH value, total hardness, chloride, Ks4,3 and conditioning medium.
  • Further system-specific measurements are necessary periodically and must be documented.
  • What is to be measured depending on process or system, for example: pH value, conductivity, calcium, Ks4,3, chloride, sulphate, nitrate, ammonium, phosphorus, iron, TOC, filterable substances or turbidity and silicate, chromium, copper, nickel, zinc.
  • Make-up water must reach the required circuit water quality;
  • Legionella analyses at least quarterly;
    • If legionella are found, check monthly;
  • Monthly checks of the total bacterial count (zero determination);
  • Pseudomonas analysis every quarter (optional as a recommendation).

Which biocides can I still use?

  • You can only use biocides whose effectiveness against legionella has been proven in accordance with DIN 13623.
  • All required expert opinions must be available.
  • Non-oxidative biocides must be replaced every three months unless they are still effective.
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Your contact:
Dr. Bianca Spindler
Head of Industrial Water Competence Center
Phone: +49 89 899 369 0
E-mail: b.spindleraqua-concept-gmbh.eu