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Conveyor pulley bearings saved from gross grease contamination

Conveyor pulley bearings mounted in competitor split plummer block housings with taconite seals in an iron ore ship loading facility were suffering regular premature failures with an mean time between failures of only 12 months. Investigation showed the cause to be gross iron contamination of the bearing grease inside the housings with samples showing a content of 5 000 to 140 000 ppm. The existing seals were replaced with SKF Taconite Seals and the levels of contamination of the bearing grease inside the housings dropped dramatically. Samples taken at 6 months showed only 10 - 60 ppm of iron and bearing MTBF was extended beyond that of the pulley lagging.

*MTBF - Mean Time Between Failure

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