If a pump with a large volume and a maximum of 150 RPM was selected, internal friction in the pump would also be reduced to a minimum. Solution Rotan Pumpengesellschaft GmbH built a test pump by means of standard parts from the CD + HD/PD pump ranges with stuffing box plus 2 special, ma - chined parts as well as 2 special shaft seal rings and a ground rotor shaft coated with tungsten carbide at the shaft seal area. The pump was equipped w

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