Oil in the transport process and the general use of process will produce solid material, water, emulsion and other impurities, in fact, dealing with different types of oil filter oil is the choice of different impurities in different ways oil filtering, oil filter method 

There are three types:
1, relying on filters and other filter media to intercept the role of mechanical filter oil filter impurities;
2, the use of gravity separation and centrifugal separation principle of centrifugal oil filter;
3, according to the boiling point of water and oil theory, oil-water separation by distillation methods, and mechanical filtration remove solid impurities in the vacuum oil filter;

Frame pressure type oil filter because the filter and other filter media had to rely on the role of filter block impurities, impurity particles will plug the filter mesh quickly and require frequent replacement of the filter, resulting in use of high cost, while smaller than the filter pore size fine particles is invalid, it is difficult to achieve cleanliness to NAS6 ~ 8 level stable oil filtering effect. Plate filter press, for concentrations below 50% of the low viscosity, less the amount of liquid containing slag filter for closed in order to achieve purification, sterilization, clarification and other fine filter, semi-fine filter requirements; direct use microporous filter membrane, may, without microporous membrane filters can be achieved sterile filtration purposes.

Centrifugal oil filter to remove free water and coarse impurities, but the fine particles of emulsified oil or powerless. Can not remove the paint and other suspended solids; not effective against bacteria. Requirements for high-viscosity oil heated to 84.5 ℃ above, accelerated oil aging. Watershed poor performance, may lead to more oil emulsion. The system requires frequent cleaning; system requirements for installation of high, large projects. Equipment, high cost, does not solve the problem of oil emulsion, many power plants, steel mills have stopped using the centrifuge;

Vacuum Oil water separation using a vacuum distillation method, the use of mechanical filtration to remove impurities. Mechanical filters have been mentioned above, the filter using high cost, mainly the cleanliness; vacuum separation is only suitable for the removal of water moisture in oil, such as handling transformer oil, turbine oil for water content and more, lubrication oil or oil-film bearings, vacuum dehydration is not suitable; with water emulsified oil vacuum oil processing inefficiencies, low temperature dehydration is very slow; foam at high temperature, dehydration process is still very slow, and difficult to operate; for serious leakage units, vacuum isolated from the water system to produce water less than the amount of oil, vacuum oil filter processing, only to consume energy, waste of human resources, can not solve the problem.

In general, oil vacuum oil purifier is mainly used in the case of water, to remove a small amount of oil in the water, plate and frame pressure type oil filter mainly used to remove solid impurities in the oil, a simple filter plate machine has been rarely used oil, oil filter available precision (mobile, with filter), is more convenient; course, in the lubricating oil in the mechanical impurities, the use of plate and frame pressure type oil filter far more economical. As to whether a certain use, we need to understand the cycle of oil particle size requirements, the use of filtering accuracy than 20UM frame pressure type oil filter, if you need to improve accuracy, precision oil filter must be used

Hydraulic oil filtration, Transformer oil filtration, Turbine oil filtration, 
Waste Engine Oil Filtration System

High vacuum oil purifier, or commonly known as degassifier, is a machine that purifies the insulating oil of high voltage equipment. Degassifier consists of heaters, vacuum pump, centrifuge pump and filters that work together inorder to improve the insulating capability of the HV equipment insulating oil. 

The heater is important as this will "cooked" the insulating oil that passes through the degassifier. Through this cooking method, the water and moisture content of the insulating oil will be eliminated. The "cooked oil" will then go through an enclosed chamber. Inside this chamber, the insulating oil will be subjected to vacuum pump and centrifuge pump. The vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum . Therefore, this vaccum pump will remove other gases in the oil that can contribute to low level of insulation like acetylene, hydrogen, ethylene, etc. The centrifuge pump is also operated to increase the pressure of a fluid. Centrifugal pumps are commonly used to move liquids through piping. 

 The constant stirring of the oil by the centrifuge pump will also make the oil vacuuming more effective. Then, the treated oil will be collected to a basin, where it will be pumped again to a filter. The resulting oil will be transferred to a collecting container where it will be ready to be pumped to the desired equipment. There are two types of degassifier, the off-load degassifier and the on-load degassifier. As the name implies, these degassifiers can be operated to an equipment which is energized (on-load) and de-energized (off-load). Degassifiers can also be used to refill a power transformer. Most of the time, only the heaters are left operational and centrifuge pump, vacuum pump and the filter are bypassed during refilling, especially when new insulating oil is being refilled.


by robert ranchez
Lubricating oil purification, Insulating oil Purification, 
Turbine oil purification, Waste engine oil purification