Several obstacles may be encountered when attempting to measure varnish in turbine or rust and oxidation (R&O) inhibited lubricating oils. Despite the recently published varnish potential test standard (membrane patch colorimetry, ASTM D7842), there are still real challenges to determine an acceptable level of varnish measurement that can provide trouble-free operation as well as an unacceptable level that would warrant taking measures to prevent and remove varnish from lubrication systems. Another obstacle to successful monitoring and establishing proper alarm levels is the constantly changing combination of…
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The Varnish Issue: Strategies for Successful Monitoring and Acceptable Levels
