Research shows that 52% of bearing failures are due to contamination of the bearing oil*.
* Bloch, Heinz; “Pump Users Handbook: Life Extension” 2011.
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Research into Bearing Failures
Reliability by numbers: 52% of bearing failures. A study into equipment reliability conducted at a major refinery has published statistics on causes of equipment failure. They concluded that 40% of overall rotating equipment failures (pumps, mixers, etc) were due to bearing failure.
They further estimated that 48% of all bearing failures were due to particle contamination and a further 4% were due to corrosion (caused by liquid in the oil). Therefore 52% (total contamination cause) of 40% (bearing failures) = 20.8% of all rotating equipment failures are caused by contamination of the bearing oil.
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