The accumulation of particulate, which in suspension or sedimentary form, is not desirable as it is deemed to provide nutrient or harbour for bacteria. It will have an adverse effect on heat transfer surfaces and, in sedimentary form, can promote the formation of corrosion cells.
While periodic maintenance tasks are necessary for mechanical operation and cleaning purposes, it has been recognised, in recent years, that the benefit of continuous suspended material removal through mechanical action can have considerable benefit to the circulating water in terms of clarity, water treatment regime efficacy and reduction in maintenance cost or activity.
The ultimate cleanliness of the cooling tower can be heavily influenced by the presence of previously airborne contaminant, which will ultimately “fall out” on low velocity surfaces such as pond basins or fill pack heat transfer surfaces.
Current guidance gives high emphasis on the importance of pack cleanliness and actively promotes the use of devices to reduce the potential for foreign matter deposition. Constant screening or separation can provide considerable benefit in respect to overall cleanliness and potentially reduce fill pack maintenance and replacement cost.
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