Jacopa’s Copa® Cyclone is a water-powered, self cleaning storm screen for combined sewer overflow (CSO) screening to 6mm in two directions, The Copa Cyclone’s unique design eliminates the need for an external power supply or mechanical cleaning of the screen’s surface.

The Copa® cyclone only starts operating when the water level reaches the shaft centre line. An internal baffle directs the flow onto the internal vanes attached to the aperture drum and cause the drum screen to rotate. The internal baffle extends from the 3 o’clock position to the 12 o’clock position. This design only allows flows to enter the drum when water levels are above the 3 o’clock weir level.

When the drum starts to rotate (with even the smallest inflow) there is a high shear-action between the drum face and the surrounding water and any screenings attached to the outside of the drum will be stripped from the screen face. The drum rotates faster as more flow enters, increasing the shear action and consequently improving the cleansing action. The unit is therefore self-regulating over the full range of flows. The drum will even continue to operate if the unit becomes completely submerged, utilizing the maximum inflow.

The screens are manufactured from stainless steel (304L and 316L) and there are three standard sizes (CY35, CY75 and CY150) treating flows of up to 35, 75 or 150l/sec in a single unit. For larger flow rates multiple units can be installed.

The key features of the Cyclone screens are that the shaft bearings are sealed for life, Teflon coating can be applied to prevent FOG adhesion, zero pin holing, and self-regulating.  Typical applications would be storm tank discharges, pumping station overflows and storm over-flow chambers.