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The SPIRAM centrifugal pump uses a specially designed screw-shaped impeller to feed the pumped fluid into the conical inlet chamber. The impeller then uses the centrifugal force generated by the impeller to push the pumped fluid out of the pump.
The construction of the screw-shaped, single blade is specially designed for low rotational speeds of impeller, avoiding the destruction of hydraulic parts by abrasive particles. This means that the design of the pump has been perfectly executed not only to prevent clogging but also to guarantee the long lifetime of the pump

Each screw-shaped impeller on SPIRAM pumps is designed with an emphasis on the free ball passage. Thanks to this, the pumps are able to handle solids of sizes up to 100% of the discharge flange diameter.

The combination of the conical narrowing of the meridional cut, the small wrap angles of blades and the low lead-in angles of the fluid path promote movement of the product from the impeller suction side to the discharge section with minimal opportunity to cause blocking. In general, the type of hydraulics involving a single bladed screw pump with an impeller eliminates the possibility of clogging it. What passes through the inlet port will also pass through the outlet port, thanks to the volute rising towards the rear side.

Furthermore, hydraulics working on such a principle minimize the time of the fluid flow through the pump while reducing the abrasive effect on the pump caused by gravel, sand or similar fine solids.


In addition, each SPIRAM pump is provided with a system for adjusting the clearance between the front plate and the impeller to achieve the maximum hydraulic efficiency of the pump with long-term effect on the pre-set minimum power consumption of the pump unit.

The impeller of the SPIRAM pumps comes into contact with the pumped fluid at a lower percentage rate, thereby differing from common centrifugal impellers with an upstream cutting system. While other pumps cut the fibrous matters and other waste contained in the fluid into smaller parts, the impeller of the SPIRAM pump transports these materials thanks to the low shear force and its shape with no or minimal damage to its structure. All the mentioned advantages of SPIRAM pumps are available while achieving a high lvel of hydraulic efficiency from the pump. The hydraulic efficiency of up to 91% for slurry pumps is a parameter that is comparable to that of multi- blade centrifugal pumps intended for pumping clean water.

Thus, the use of SPIRAM pumps creates significant preconditions for long-term, trouble-free operation at the lowest possible operating costs.

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