KEYWORDS

Maintenance: Oxidative Degradation, Maintenance: Oil Condition Monitoring

NEW ESTIMATION METHOD BY OXIDATIVE DETERIORATION OF TURBINE OILS BY THE COLOR OF MEMBRANE PATCH

In recent years, especially oxidation degradation of the turbine oils for power generation is a serious problem. Therefore, our laboratory has developed colorimetric patch analyzer (hereinafter called as “CPA” for a diagnosis method of the lubricating oils). In this study, we investigated a new estimation method for oxidative deterioration of turbine oils by color of membrane patch and the Dry Turbine oil Oxidation Stability Test (Dry TOST). We prepared sample oils which were degraded by oxidation in the laboratory using a Dry TOST apparatus and measured the color of membrane patches which filtered them using CPA. The relations between the color of membrane patch and the RPVOT residual ratio were investigated. As a result, it is found that new estimation method using CPA and Dry TOST can monitor a decrease of the RPVOT residual ratio from an early stage of oxidative deterioration.

AUTHORS

Tomohiko Kon, Tomomi Honda, Eiki Kitahara, University of Fukui, Fukui, Japan, Akihiko Yano, Mitsubishi Heavy Industries Ltd., Nagasaki, Japan and Akira Sasaki, Maintek Consultant, Yokohama-shi, Kanagawa. Japan