STÜBBE X-CLASS pumps for handling suspensions

Two heavy-duty pumps of the STÜBBE X-CLASS type NXHE 80-50-250 and NXHE 65-40-250 with STÜBBE mechanical seals custom-adapted for the specific application.

STÜBBE started a field test under the most extreme pump operating conditions. Its aim was to extend the maximum service life achieved to date. Two pumps from a third-party manufacturer were replaced with STÜBBE X-CLASS heavy-duty pumps. The most critical point in the production process was equipped with the type NXHE 80-50-250, ensuring the required peak volume of 35 m3/h at a delivery head of 22 m. The pump conveys a suspension with a solids content of up to 400 g/l and a density of >1.5 kg/dm3 at a temperature of 45-65 °C. The STÜBBE single-acting mechanical seal with continuous flushing of 70-100 l/h is used to cope with the high solids content. During operation, it was found that the excessively contaminated rinsing water led to limescale deposits that restricted the axial mobility of the mechanical seal. STÜBBE responded immediately and supplied a newly designed mechanical seal solution. This example shows how an intelligent modular system can be used to adapt a pump and shaft sealing to a specific application. The metallic chamber design of the STÜBBE X-CLASS pump absorbs all forces that occur and guarantees a complete separation of force absorption and chemical resistance through its design. This is achieved through use of separate, thick-walled and easily replaceable plastic casings using a variety of materials.

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