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Demystifying Sludge and Varnish
The approach of detecting and analyzing sludge and varnish problems in machinery is not the same as used oil analysis. In many instances this is because the evidence is not always in the oil. Read More
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Review of Degradation Mechanisms Leading to Sludge and Varnish in Modern Turbine Oil Formulations
In recent years, there has been an unusually large number of reported cases associated with varnish and sludge formation in turbine-generator and compressor applications using Group II turbine oil formulations. Read More
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Sludge and Varnish: Two Puzzling Contaminants
Most oil-related problems in machinery lead to wear or corrosion. However, there is one very serious problem – the presence of sludge and varnish – that may cause neither. Instead, these substances plug flow passages and cause valve sticking. Read More