SPECIALIST EQUIPMENT LOW-WEAR CONVEYANCEof wastewater
Michael Groth explains how robust rotary lobe and progressing cavity pumps make water treatment easier
U
sed service water from industrial processes is one of the most problematic types of wastewater due to its composition, which is often very demanding for
conveying systems. To enable problem-free treatment of this kind of wastewater in spite of this challenge, Netzsch has developed special models of the Tornado T2 rotary lobe pump that withstand a wide variety of media: the T.Envi is specially designed for a long service life with minimum wear, so that it can also convey extremely abrasive media without any problem. A large German concrete works has been using this solution since April 2015 to transport its mineral wastewater and has so far not recorded any relevant signs of wear. T e building materials and concrete parts manufacturer regularly experiences considerable amounts of mineral wastewater with pebbles up to 20mm when cleaning the mixing plant. However, the centrifugal submersible pumps that had been used for this until 2015 did not withstand the stones and sand in the water for long due to the high speed required. Excessive abrasion and wear meant it made no sense to carry on using the pumps after only around six months. T e company therefore decided to switch to a Netzsch rotary lobe pump.
Designed for long service life A T.Envi specially designed to be extremely robust and for a long service life with minimum maintenance eff ort was used. T e reason for this is an innovative mixture of materials: instead of elastomer lobes rotating in a metal housing, this involves two hardened steel lobes rotating in a rubber housing insert that is easy to replace. Steel is less susceptible to material fatigue due to dynamic forces – of the type that arise when there is repeated stress on the elastomer or plastic rotary lobes, which is otherwise common – this means longer durability of the moving components is achieved. In addition, there is less deformation
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of the metal with changing temperatures, thus allowing work with lower tolerances in manufacturing, which is refl ected in higher effi ciency. T is has the added advantage that the pump can be run at a lower speed, which aff ords the components greater protection and reduces wear even more.
The concrete works installed a T.Envi rotary lobe pump, which is specially designed for diffi cult media and therefore has a particularly robust construction
T e pump has been working without any
problems since it was commissioned in April 2015 and has been conveying 18 m³/h at 3 bar. Checks have shown hardly any wear, in spite of the mineral components in the wastewater. Many application examples show that reliable
and suffi ciently robust conveying solutions do currently exist for effi cient treatment of wastewater and sludge. T is not only opens up the opportunity for companies to improve their eco-friendliness; appropriate systems also enable recycling of raw materials that are sometimes valuable and reduce the outlay for storage and disposal of wastewater. Customised pumping concepts can make an important contribution to operational reliability and ultimately to effi ciency.
For more information at
www.engineerlive.com/ime Michael Groth is with Netzsch.
www.netzsch.com
The interior is designed to be free of dead spaces. In addition, the combination of steel rotary lobes and elastomer insert leads to high wear resistance
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