Fretting Corrosion on Large Split Thrust Bearing Runners

by René A. Baudry, Electromechanical Engineering, Associates, Pittsburgh, PA, USA,
Donald H. Rielly, Electromechanical Engineering, Associates, Pittsburgh, PA, USA,

Document Type: Proceeding Paper

Part of: Water Power '87


In the early fifties interfacial slip was measured on laboratory models. Design improvements, resulting from these tests, were incorporated into later machines. These improvements appreciably reduced fretting corrosion wear, but did not eliminate it. It was observed again after a number of years of operation. The complete absence of fretting corrosion on some bearings which are approaching fifty years of continuous operation led the authors to reconsider this problem and to establish that high pulsating oil film pressure could penetrate between the splits of the runner, causing larger interfacial slip than could the previously considered pressure waves. This explains the large fretting corrosion wear observed on some machines. A very simple and positive method of preventing the penetration of oil film pressure into the splits, thus eliminating the cause of fretting corrosion, is suggested.

Subject Headings: Corrosion | Thrust | Wave pressure | Equipment and machinery | Failure analysis | Hydro power | Power outage

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