The cleaning function within circular tubes requires a water flow velocity in minimum of 0.6 m/s at a pressure drop of 0.06 bar. For elliptic tubes the velocity in minimum must be 1.0 m/s.
The friction resistance between bristles and the internal wall of the tube reduces the brush velocity to half of the water velocity. This velocity difference between cooling water flow and brush improves the splash-out of the soluble fouling particles. There is no grinding on the natural protection layer of the heat transfer surfaces or protective layers whatsoever.
The materials of brush caps, bristles and internal wire are resistant against any kind of cooling water (for example: city, ground, surface and sea water) up to water temperatures of 100°C. Special materials for hire temperature are also available.
The assortment of cleaning brushes is designed for a diameter range from 10mm to 24mm in case of circular tubes, for elliptic tubes there is a special design available.
The cleaning cycle should be every 2 hours for polluted water like filtered brackish water out of sea’s and lakes up to every 4 hours for standard treated open type evaporative cooling systems. The life time of the brushes vary from 1 to 5 years up to the water quality used.