The volute casing is optimized both hydraulically and structurally to be as versatile as possible. In terms of hydraulics, we can adapt several different impellers for one volute, which are able to cover huge range of flow rates and heads at different rotational speeds. In terms of construction, the volute is designed so that it can be used in different horizontal and vertical installations, which means that one and the same piece of volute can be incorporated either in the standard horizontal version with the bearing housing or in the vertical version with the submersible electric motor.

For pumps equipped with semi-open impeller it is very important that the clearance between the front plate and the impeller is as narrow as possible in order to maintain the design efficiency. In the case of slurry pumps, the clearance increases over time due to the action of the abrasive particles. Such clearance can be corrected to the optimum value using the SPIRAM pump adjustment mechanism, thus keeping the pump highly effective. And, it is important to note the efficiency of the pump is directly linked to the saving of electricity and to the environmental impact

A very common problem of slurry pumps is the settling of impurities in the sealing space, which results in premature wear or failure of the mechanical seal. SPIRAM pumps have a special feature - a discharge groove provided on the rear plate and a discharge groove provided on the conical surface of the sealing spacer, which are continuously connected. This maximizes the effect of “discharging” small debris from the sealing space back into the process stream. Such a way of protecting the seal is also present in the case of pumping fibrous fluids. Moreover, such groove is provided also on the front plate, where it prevents the fibrous matters from getting entangled around the impeller.

The sealing space of the SPIRAM pumps is designed so that different types of mechanical seals from different manufacturers can be installed there. This means the use of various designs ranking from standard single mechanical seals to double cartridge seals with active cooling or heating the sealing space. SPIRAM pumps also offer special methods of sealing, such as polymer-based packing that is used for heavy duty applications requiring absolute maintenance-free systems.

The most important component of the SPIRAM pumps is the impeller itself, which looks like a helix. This unique shape makes it possible to transport media containing large solid particles at high efficiency of the pump unit. An indisputable advantage of this type of impeller and hence the entire hydraulic system is the combination of the remarkably wide solids passage and the high hydraulic efficiency in the field of sludge pumps. In case of individual requirements it is possible to design the impeller and so the entire pump with specific parameters, thus obtaining optimum performance characteristics for application concerned.

SPIRAM pumps are available in different versions. These also include the proven “heavy” version of the pump horizontally arranged on the base frame with a separate bearing housing and with a separate foot motor. This version shows extreme durability even in the most demanding applications and a very long service life as well. Other great advantages include low demanding maintenance and operation of this pump version.