Two-stage pump bearings wear faster than the single-stage pump running fast

The B80 KGK G3 two-stage pump series set a new standard for plastic centrifugal pump products, opening up a new dimension for reliable and safe operation of plant engineers and operators. Demand for vertical submersible pumps is increasing today in flue gas cleaning, gas scrubbing or surface cleaning applications. These types of pumps are indispensable to ensure reliable operation and faster cleaning processes. However, due to the different technical characteristics of the materials, the leading technology applied to metal pumps can not be applied simply and unambiguously to the design of plastic pumps. Due to the limited thermal elasticity of plastic, plastic pumps can not withstand the same high bearing loads as metal pumps. Due to the increased size of the impeller, there is also an increased need for a single-stage pump with a submerged depth of greater than 2000 millimeters to balance the high radial forces produced by high-speed pumps. This exposes the limitations of thermoplastic materials. For this purpose, a modular system was developed for the development of a two-stage pump series with a nominal speed of 1,450 rpm, which meets operational safety and system availability even in continuous operation. The product uses two impellers arranged one behind the other impeller so that the pump head reaches 85 meters. Two-stage pumps have significantly better wear resistance than fast acting single-stage pumps when used to pump liquids that contain solids or have low lubrication characteristics. Another important advantage is that its mounting dimensions are much smaller - an important aspect of plant engineering. Due to the use of a four-pole drive system, the pump generates very little noise. The two-stage centrifugal pump flow of up to 280 cubic meters / hour, head up to 85 meters. Depending on the choice of materials, the applicable temperature range from minus 10 degrees Celsius to 90 degrees Celsius. The pump is submerged to a depth of 4,000 mm. Dry gas seals are used to protect the bearings and the motor is mounted as an atmospheric shaft seal. The shaft can also be sealed by a single acting standard balanced mechanical seal. The axial force is absorbed by the grease / oil impregnated rolling bearings. The excess radial force is absorbed by the large main bearing, which is made of PTFE-GF / ceramic or silicon carbide fiber toughened silicon carbide (SiC / SiC) Pumping media. The pump housing made of polypropylene and polyvinylidene fluoride. Glass fiber reinforced or coated polypropylene for high temperature applications.