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HSE endorses new Legionella guidance for hybrid coolers

Water Management Society advice covers cooling systems designed to operate in both dry and wet modes

The Health and Safety Executive has endorsed new guidance from the Water Management Society which draws attention to the specific risk controls needed for hybrid cooling systems. The HSe says that in recent years there has been increasing use of dry/wet cooling systems, designed to operate both in dry air cooled mode and wet evaporative cooling mode,

The HSE notes the systems, sometimes referred to as “hybrid” or “adiabatic” coolers, (described in HSG274 Legionella Technical Guidance Part 1, paragraphs 1.18-1.21) come in a variety of version  with a correspondingly wide range of risk profiles.

The Water Management Society, endorsed by HSE, has published a document which supplements HSG274 Part 1 with more detailed information to help evaluate between different designs and risk profiles of dry/wet cooling equipment.

The Executive said the guidance is to help dutyholders, which includes employers, those in control of premises and those with health and safety responsibilities for others, to comply with their legal duties and gives practical guidance on how to assess and control the risks due to legionella bacteria in dry/wet cooling systems. 

This guidance is freely available to download from the Water Management Society .

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