On the problem of the turbine oil purity

Lubricant contamination appears to be a serious threat to the equipment performance and reliability. The most destructive particles in oil are approximately equivalent in size to the working clearances in the machine friction (sliding) zones. They easily remain suspended due to their small size, turbulent fluid motion, and the missing effective filtration. Rehydration is the most common violation of operation conditions and the cause of deterioration in all other oil quality indicators. Lubricant contamination control is the process of minimizing or eliminating ingress, formation, and accumulation of the contaminants in lubricants and lubricated systems. Contamination control includes three main stages: eliminating the contaminants ingress; their removal and monitoring the oil cleanliness. Filtration plays a key role in reducing the bearing wear rate. The paper describes criteria used in evaluating the filter efficiency. It nots disadvantages in the existing oil purification system of oil supply and control systems in the domestic turbo units. The most important factors to consider in selecting a filter are provided. The paper determines efficiency of the oil tank filters with partitions made of brass mesh and polyamide filter material. After replacing brass meshes with the polyamide filter material in the oil tank filters of the T-180/210 LMZ turbo unit, the solid particles amount in oil larger than 5 μm decreased by 5.8 times, the purity corresponded to class 7 according to GOST 17216–2001. The amount of emulsified water droplets in oil larger than 25 μm decreased by 4.7 times. Polyamide filter material removes water from the turbine oil more effectively than the brass mesh. As the result of study and data generalization on the oil cleanliness for combined bearing oil supply and turbine control systems (in clean compartment of the main oil block), class 7 or 8 of GOST 17216 2001 is required.
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