WESSLING supports operators of cooling towers, evaporative cooling systems and wet separators with analysis and consulting. After the cold season and a possible seasonal shutdown, it is particularly important to check the cooling water of the systems for bacteria such as legionella, to detect contamination and to take measures if necessary.
Evaporative cooling systems, cooling towers and wet separators can be a potential cause for legionella infections. Microorganisms find favourable living and reproduction conditions in the milieu of the circulating water if it does not meet hygienic requirements. VDI Guideline 2047-2 prescribes minimum requirements for the safe hygienic operation of evaporative cooling systems, and this is also legally anchored in the Ordinance on Evaporative Cooling Systems, Cooling Towers and Wet Separators (42nd BImSchV). WESSLING offers sampling in accordance with the 42nd BImSchV as well as regular microbiological testing. Legionella determination in cooling water is carried out according to the ISO11731:2017-05 standard.
In addition to the Legionella and general colony count parameters, we recommend determining the Pseudomonas aeruginosa parameter. As initial colonisers of surfaces, Pseudomonas literally form the basis for biofilms. Biofilms form a habitat for various bacteria, including Legionella.
Binding deadlines apply to the inspection of orderly plant operation in accordance with §14 of the 42nd BImSchV, which can be found in the Ordinance. After the initial inspection, installations must be inspected again every five years. The inspection must be carried out either by type A inspection bodies or by publicly appointed and sworn experts. WESSLING also employs publicly appointed and sworn experts for these inspections.