November 2002

Columns

HP Reliability: Grease lubrication controversies resolved

An electric power producer was understandably puzzled when, about a year ago, it received a memorandum from one of the premier manufacturers of rolling element bearings stating, in effe..

Bloch, Heinz P., Hydrocarbon Processing Staff

An electric power producer was understandably puzzled when, about a year ago, it received a memorandum from one of the premier manufacturers of rolling element bearings stating, in effect, that neither sealed nor shielded bearings are regreasable. There's a serious conflict here, since we learned decades ago that grease consists of 85% oil, the rest being soap and other additives. Moreover, much literature tells us that the oil portion of the grease "bleeds" or "seeps" through the gap between the shields and the bearing inner ring, and that capillary action causes the oil to leave the soap and wet the rolling elemen

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