Industrial oils are widely used in the energy industry. They provide heat dissipation and insulation in power transformers, lubrication of bearings and gearboxes, heat dissipation in turbines of power plants. In-service oils get contaminated and oxidized and require restoration.
What is oil restoration?
Oil restoration rejuvenates the original properties and parameters of oil that undergone a change during operation. The changes depend on the type of oil and its purpose. They are changes in: color, viscosity, acid number, electrical strength, dielectric loss tangent, etc.
Oil restoration is preceded by oil sampling and analysis, that determine the following restoration process
Processes used in industrial oil restoration
Industrial oils are restored through physical, chemical and physicochemical processes. Physical methods are sedimentation, centrifugation, filtration, evaporation. Physico-chemical methods include selective purification, ion-exchange purification, coagulation and adsorption. Chemical methods are sulfuric acid purification and hydrogenation. None of these approaches can be considered effective enough. They show different results depending on oil state. Therefore, in practice, they are combined to obtain better results.
Oil restoration on GlobeCore equipment
Based on accumulated experience, GlobeCore specialists designed the equipment that restores industrial oils directly on-site. CMM-R unit passes oil through thermal vacuum treatment to remove water and gases, then filtration to remove mechanical impurities, and finally through adsorbents to detain the oil aging products.
CMM-R unit can be connected to an energized or de-energized transformer. In such connection the oil circulates in a loop between a transformer and an oil unit: with oil flow washing away the contamination, which would normally remain in transformer after draining and refilling. Thus, the process of oil restoration lasts until the oil is fully restored and and does not contain harmful impurities.
Specially for turbine oil restoration, GlobeCore developed the CMM-T unit. Correctly chosen frequency of cleaning allows to reduce the number of failures and breakages in the turbine oil system by 20-25% .
The energy industry cannot afford the failure of a transformer or a turbine which leads to large financial losses. Therefore, it is advisable to perform all maintenance activities for these devices, including oil restoration. This will help to save money, improve reliability of power equipment and extend their service life.