The optimised pump chamber of the 3NS reduces turbulences and backfl ow, preventing losses of pressure and speed and is saving energy



Roger Willis reveals how a Brazilian mining group switched to multi screw pumps

istorically, a Brazilian mining group used multi screw pumps from diff erent manufacturers for the pumping of oil to lubricate and form the journal bearing of ball mills. As contamination of the oil was frequently detected, the pumps had to be replaced regularly. Due to the lack of on-site services of the manufacturers, replacement or spare parts for the imported units were met

Due to the high costs associated with procuring spare parts and new pumps of the same model and the lack of on-site service, the company decided to switch to Notos pumps from Netzsch


with long delivery times as well as high costs. To resolve this issue, the mining company decided to switch to the locally manufactured and supported Notos pumps from Netzsch do Brasil in Pomerode. T is company is part of the global Netzsch Pumps & Systems organisation, headquartered in Germany. A deciding factor for this choice was that the mining group would be able to use the service of the Brazilian production plant. “T e multi screw pumps are used to pump oil for the bearings of ball mills. In this application, the oil both lubricates and carries the load of the shaft,” says Monica Mitterstein from Netzsch do Brasil. T e customer used two multi screw pumps per mill: up to June 2018, one model pumped mineral oil with a viscosity of 200 cSt at a maximum fl ow rate of 500 l/min and a pressure of 70 bar. T e three additional units pumped ISO VG 220 oil up to 220 cSt. T e fl ow rates were a maximum of 500 l/min at 25 bar, 400 l/min at 80 bar or 144 l/ min at 80 bar. Due to the high contamination of the oil, the original eight pumps had to be replaced every six months. As the customer used a large number of pumps, which were imported, the procurement of new pumps and spare parts was costly,

had long delivery times and required additional stock for emergencies. “T e switch to Notos pumps happened very quickly and was motivated by the desire to simplify spare part procurement, lower the spare part costs and have service engineers available on-site”, explains Mitterstein. “Furthermore, the new pumps were expected to be more reliable than the previous models.”

LOW INSTALLATION COSTS AND LOCAL SERVICE For three of the four pumps used in Brazil, Netzsch only provided the cartridge, as the housings of the original pumps could still be used with no problems. T is resulted in various benefi ts for the customer. On one hand, the costs for installation remained low; and on the other, three completely new and effi cient Notos pumps are now available in the process. Netzsch only supplied the complete unit for the fourth model as the cartridge did not fi t into the housing of the original pump. “Also, the fourth model 3NS works with

no problems and meets all the customer’s requirements,” adds Mitterstein.

Roger Willis is with Netzsch

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