Coal Mining (Brazil) The challenge Harsh conditions, that is what characterizes most coal mines' operations. The challenge presented to Sidrasul Brazil by a mine in the Santa Catarina region, was pumping excess water from extraction, with a pH between 2.5 and 3.5 with moderately abrasive coal particles ranging from 0.5 to 4 mm. The mine has a depth of 66 meters and a total extension of 600 meters. Expensive reparations Water was being pumped from the drilling front to the retention basin with conventional horizontal end-suction pumps. Coupled to electric motors these pumps were expensive to operate and had a very short life time, burning regularly due to phase failures and dry-running. The only solution at that moment was rewinding the electric motors every 20 days on average and send

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