April 2023

Soluble and Insoluble Varnish Test Methods

Trending Varnish Buildup in Mineral Turbine Oil

Wasan Chokelarb Wasan Chokelarb
author photo Wasan Chokelarb is a Ph.D. student at the Department of Chemical Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand. He works at Focuslab Ltd. He has been a co-conductor of Noria Oil Analysis and Machinery Lubrication Courses since 2005. Learn More
Pornsawan Assawasaengrat Pornsawan Assawasaengrat
author photo Lecturer, Department of Chemical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Learn More
Andy Sitton Andy Sitton
author photo Andy is one of S.E. Asia's leading Oil Analysis Instructors, with a wealth of experience in Oil Analysis in the region, in such countries as Indonesia, Singapore, Malaysia, Philippines and Thailand. Andy has established and managed Oil Analysis laboratories for such names as Optimal Systems Inc. and Litton Industries, before co-founding Focuslab Ltd. in Thailand. Learn More
Thanant Sirisithichote Thanant Sirisithichote
author photo Co-founder of FocusLab Ltd., the leader in oil analysis in S.E.Asia; Co-instructor of Noria ’s Machinery Lubrication and Oil Analysis courses in Thailand; A recognized expert in the field of machinery lubrication and oil analysis in Thailand; A recognized expert in fuel & lube additives; Developer and designer of modern oil analysis report for maintenance & reliability professionals. Learn More
Pongsert Sriprom Pongsert Sriprom
author photo Asst. Prof. Dr. Pongsert Sriprom is a Lecturer at the Program of Food Process Engineering, School of Food Industry, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand. Learn More

Power plants, especially turbines, are expected to operate with high reliability and with controllable operating and maintenance costs. In this study, in-service gas turbine oils from three different power plants were sampled and analyzed — the results indicate that the monitoring of insoluble varnish together with soluble varnish improves the diagnostic and early correction of varnish problems in gas turbines.

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