Avoid Turbine Trips in Gas & Steam Turbines The CJC® Varnish Removal Unit, VRU, is intended to remove soluble varnish from oil with extreme efficiency. The VRU can be used for the following purposes: Gas or steam turbines with a combined or separate lube and control oil system Base or peak loaded gas or steam turbines operating at low, medium or high oil temperatures Gas Turbine Compressors  Highly stressed and hot running lube oil or hydraulic oil systems