If the turbine oil needs to be changed or an inspection is due, the oil is not simply replaced. At WESTO, sustainability takes top priority for the benefit of the customer!
Once the system has been drained, it is cleaned thoroughly. If a higher-quality turbine oil is then poured in, WESTO also takes into account another important factor: modern turbine oils, which have a higher oxidative stability and contain fewer harmful substances, are refined differently and with different additives from earlier products. However, substances formed as a result of oil ageing can be held in solution only to a very limited extent. It is therefore important to reduce the remaining waste oil, as well as any impurities and deposits already in the system, to a minimum when changing the oil. Different cleaning plans are implemented depending on the analysis carried out before the oil change.
Sticky or soft reaction products and deposits (varnish) are removed when the turbine is in operation, even before the oil is changed. This cleaning is carried out by WESTO according to the Fluitec ESP process, in which oil reaction products attach to resins. This prevents contaminants that have dissolved and dispersed in the oil from compromising important properties like air and water separation characteristics or oxidation resistance in the new oil charge, and jeopardising the function of the entire turbine oil charge.
Varnish removal using ESP is also being used increasingly as an oil maintenance measure between changes. WESTO completely avoids the use of cleaning supplements like detergents or water in its cleaning measures!
Customised partial flow filter system
In 2012, WESTO, in collaboration with Currenta, developed a partial flow filter system customised specially for the turbocompressors used in refrigeration at the Leverkusen and Dormagen sites, that takes into account the proportion of ammonia (NH3) in the oil circuit. It has the advantage that it can be connected to any type of compressor that uses NH3 as a refrigerant. The system also allows the oil purity trend in the oil circuit to be monitored simultaneously. It therefore plays a crucial role in the operational safety of the system components used in refrigeration.