KEYWORDS

Maintenance: Oxidative Degradation, Additive Depletion

DEVELOPMENT OF DEPLETION DIAGNOSIS METHOD FOR THE ANTIOXIDANTS BY THE COLORIMETRIC ANALYSIS OF MEMBRANE PATCHES

Degradation causes of lubricating oils are roughly classified into two types, one is caused by solid particles and the other by oil oxidation products. Oxidation is a main cause of degradation of turbine oils in high temperature operation. Therefore, antioxidants are generally added in turbine oils and they prevent the change of viscosity and formation of sludge. On-site degradation diagnosis method of antioxidant is significant for the proactive maintenance. University of Fukui developed a state-of-the-art colorimetric patch analyzer (hereinafter called as “Fukui model CPA”)to investigate degradation of turbine oil by the color of filtered membrane patches. We prepared sample oils using a rotating pressure vessel oxidation test (RPVOT) apparatus and measured the color of membrane patches which filtered them using Fukui model CPA. As a result, it was shown that our method could diagnose depletion of the antioxidant.

AUTHORS

Daisuke Hamano, Tomomi Honda, University of Fukui, Fukui, Japan and Akira Sasaki, Maintek Consultant, Yokohama-shi, Kanagawa, Japan