Whatever system of water delivery is used, it is crucial that adequate screening is provided to protect the pump and system. Conventional filter screens are usually of the ‘can’ type construction which offer relatively low performance against the ingress of debris and air which may be causing excessive wear to your pump - whilst many systems are operating without any screening at all!
The unique design of the filter discs enables a high flow area whilst maintaining exceptional structural strength. The integral leaf springs allow a constant load to facilitate optimal pressure between the discs, enabling them to remain parallel with varying separations which can be achieved with the addition of extra discs.
Conventional filter screens offer limited resistance to blocking due to their relatively small screen area. Because they are considered problematic, many pumps are therefore operated without the inclusion of any inlet filter screen. This ultimately leads to the premature failure of the pump or downstream system due to the ingress of undesirable debris
Apart from the ingress of debris, another common issue with the conventional can type filter screen - or not using any filter - is that of vortexing. Air is very detrimental to pump operation and is often induced unnoticed, causing low performance and operating efficiency as well as potential long-term damage to the pumping equipment. A vortex forms at the point of highest velocity, where the currents begin to rapidly rotate due to instability. This initiates in the first area of smallest cross section, which is usually the entry of the suction pipe. From here, the vortex funnel gradually widens up to the water surface, where air is then sucked into the pump.
vortex unlikely to form in an elliptical flow
The parallel structure of the discs in the Seradisc screen interfere with the circular formation of a vortex forming. Because the outer surface area of the Seradisc filter screen is extremely large, the velocity of water flow at any given point is relatively low. This dramatically reduces the likelihood of a vortex from forming from any point on the outer surfaces.