September 2012

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HP Reliability: When not to use oil rings

For process pumps in particular size and duty categories, oil rings are rarely, if ever, the most reliable means for lubricant application. Oil rings tend to skip and even abrade, as shown in Fig. 1, ..

Bloch, H. P., Hydrocarbon Processing Staff

For process pumps in particular size and duty categories, oil rings are rarely, if ever, the most reliable means for lubricant application. Oil rings tend to skip and even abrade, as shown in Fig. 1, unless: The shaft system is truly horizontal.1 Horizontality is very rarely obtained when shims are used to manage shaft centerline alignment. Ring immersion in the lubricant is perfect. Consistent depth of immersion can be difficult to maintain over time. Ring eccentricity is closely controlled. This is rarely possible unless stress-relief annealing is included as part of the manufacturing steps Ring bore RMS finish and oil viscosity are maintained within close limits. Viscosities can c

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