Free ball passage has always been the traditional measure of a pumps ability to handle solids without blocking. Despite recent trends and “innovative” designs, this concept remains the most vital component of a non-clog pump.
Wastewater composition is highly variable and often difficult to predict. The large free passage of a pump ensures that the materials carried in the water, whether they are hard or soft, long-fibered or compact, will not clog the pump. A large free ball passage in the impeller allows large objects to pass through with ease and prevents the accumulation of textiles or fibers.
The ratio of the pump's ball passage through which solids can pass to the discharge nozzle of a pump (referred to as Free Passage Index - FPI) guides the potential buyer through the different range of pumps on the market.
On average, a Hidrostal hydraulic system guarantees the highest Free Passage Index (FPI) of 0.88 for pumps between 80 and 200 mm discharge nozzle diameter, and goes as high as 1 for individual pumps, which corresponds to completely unobstructed passage. For pumps above 200 mm nominal discharge diameter, the FPI of Hidrostal pumps even increases compared to other centrifugal pump designs suitable for solids handling. Added to this is an outstanding efficiency of up to 87%. The only other pump type that can achieve a similar FPI index is the Vortex design, but with significantly poorer efficiency.
In pumping stations and collecting plants, waste water can be moved without problems with the non-clogging Hidrostal Screw Centrifugal Pump, in most cases even without additional equipment for primary treatment.
Hidrostal Screw Centrifugal Pumps for lower flow rates in smaller stations, which is usually the case when pumping domestic sewage, are also characterized by their typical features and guarantee trouble-free and non-clogging operation.
The outstanding characteristics of the Hidrostal Screw Centrifugal Pump, pumping of liquids with a high solids content without clogging make it an essential component in wastewater treatment.
Industrial wastewater often has very specific characteristics. Available in the configuration with high quality stainless steel for increased resistance to aggressive media, the Hidrostal screw centrifugal pump is ideally suited for their trouble-free removal.
Thanks to its non-clogging characteristics, the Hidrostal Screw Centrifugal Pump is ideally suited for difficult pumping tasks in agriculture, such as the transport and processing of viscous manure with long-fibre components.
Very high demands are placed on the reliability of loading and unloading systems as well as sewage systems on ships and offshore platforms. The Hidrostal Screw Centrifugal Pump offers the greatest possible flexibility for use in corresponding systems, even on large cargo and cruise ships. High-quality materials of construction available in the standard range, such as Duplex stainless steel, ensure excellent corrosion resistance even to seawater.