Abstract
At high speeds the power absorbed by a tilting pad thrust bearing as a result of churning the oil within the bearing casing is greater than that due to shearing the oil beneath the pads. Various methods have been used to try to eliminate, or at least significantly reduce, the parasitic churning losses. This problem has been receiving attention for the last ten years and a successful method of directed lubrication has been developed. This article compares the results of tests carried out in order to assess the advantages of directed lubrication systems against the more basic flooded system which has a pressurised casing. The effectiveness of the method in reducing the parasitic churning losses and their effect on the bearing operating parameters and consequential safety margins are discussed
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