September 2001

Columns

HP Reliability: Inductive pumps solve difficult lubrication problems

Authoritative texts show that traditional static oil sumps, both with or without oil rings, represent nonoptimum means of lubricating rolling element bearings. With sump lubrication, the rolling eleme..

Bloch, Heinz P., Hydrocarbon Processing Staff

Authoritative texts show that traditional static oil sumps, both with or without oil rings, represent nonoptimum means of lubricating rolling element bearings. With sump lubrication, the rolling elements plough through the oil bath (Fig.1) and, depending on shaft speed and oil level, often generate undesirably high temperatures in the process. Oil rings dipping into the lubricant are vulnerable to out-of-horizontal shaft installation – they tend to run downhill – and can malfunction if the correct submergence depth, linear speed or ring geometry are not maintained. Many oil rings thus degrade rapidly or apply insufficient lubricant to the rolling elements.

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