The classification is based on the type of air induction into the tower: the main types of cooling towers are natural draft and induced draft cooling towers.Ĭooling towers vary in size from small roof-top units to very large hyperboloid structures (as in the adjacent image) that can be up to 200 metres (660 ft) tall and 100 metres (330 ft) in diameter, or rectangular structures that can be over 40 metres (130 ft) tall and 80 metres (260 ft) long. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or, in the case of dry cooling towers, rely solely on air to cool the working fluid to near the dry-bulb air temperature using radiators.Ĭommon applications include cooling the circulating water used in oil refineries, petrochemical and other chemical plants, thermal power stations, nuclear power stations and HVAC systems for cooling buildings. More specific guidelines hereof can be obtained from Lenntechįor information on dip slides click here." Camouflaged" natural draft wet cooling tower in Dresden (Germany)Ī cooling tower is a device that rejects waste heat to the atmosphere through the cooling of a coolant stream, usually a water stream to a lower temperature. The risk assessment and control measures should be reviewed to identify remedial actions.Ībove guidelines are derived from the approved code of practice and guidance manual of the Health and Safety Commission third edition 2000 UK. It should then be ‘shot dosed’ with an appropriate biocide, as a precaution. Implement corrective action – the system should immediately be resampled. Review programme operation – a review of the control measures and risk assessment should be carried out to identify any remedial actions and the count should be confirmed by immediate resampling. Legionella sampling should be undertaken at least quaterly by an accredited laboratoryīelow action levels following for cooling towers are indicated.Īerobic count (cfu/ml at 30☌ (minimum 48 hours incubation Sampling should not be carried out if a biocide has recently been added.Ī general caution - relatively clear water may be heavily contaminated with bacteria. They are dipped into the water and incubated for 48 hours. Normally bacteria are monitored weekly by dip slides. Phone: +31 152 610 900 Towers Cooling tower water monitoring microbiological activity (also legionella) Every cooling tower should be monitored by routine sampling and testing for the presence of bacteria, both general (aerobic) bacterial species and legionella bacteria.Separation and Concentration Purification Request.Plant Inspection & Process Optimalisation.
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