Lubricants contamination control

Parylenes can be used for contamination control, that is, securing small particles to prevent them from damaging a surface in a sealed unit barrier coaling coaling for corrosion control and as dry lubricants. 

Contamination Control. Lubricating oils collect contaminants, such as particles and moisture, and transport them to settling tanks, centrifugal separators, filters, etc. Some lubricants, such as crankcase oils, are formulated with additives to disperse contaminants that reduce the risk of deposit formation, corrosion, or premature filter plugging. 

Contamination Analysis Contaminants of various types can enter the system and the lubricant from the environment during servicing or by internal generation. Contamination compromises machine reliability and promotes lubricant failure. Lubricant analysis targeting contamination can help ensure that goal-driven targets for contamination control are maintained. 

Contamination Control Even the best lubricants and application methods can be severely compromised by invasion of harmful contaminants. Keeping contaminants in check using the proactive maintenance strategy is essential to effective lubrication. 

Eleftherakis, J., A Proven Approach to Hydraulic and Lubrication System Contamination Control , Lubr. Fluid Power J. 2, 13-20, Aug 2001. 

Aerosol products are hermetically sealed, ensuring that the contents caimot leak, spill, or be contaminated. The packages can be considered to be tamper-proof. They deUver the product in an efficient manner generating Httie waste, often to sites of difficult access. By control of particle size, spray pattern, and volume deUvered per second, the product can be appHed directiy without contact by the user. For example, use of aerosol pesticides can minimize user exposure and aerosol first-aid products can soothe without applying painful pressure to a wound. Spray contact lens solutions can be appHed directiy and aerosol lubricants (qv) can be used on machinery in operation. Some preparations, such as stable foams, can only be packaged as aerosols. 

Lubrication skid. The gas turbine lubrication skid is usually independent of the steam turbine skid as the lubrication oil is usually synthetic due to the high temperatures in the gas turbine. Another reason is due to water contamination of the lubrication oil from the steam turbine. It is advisable to have the lubrication system be totally independent. The gas turbine lubrication skid would report to the gas turbine controller. Since the lubrication system is also used for providing cooling, it is usually operated for about 20 minutes after the gas turbine is shutdown. The lubrication skid contains at least three pumps, two pumps in which each can provide the head required and a third pump, which is usually recommended to be a DC drive for emergency use. These pumps and their control fall under the drive level hierarchy. 

There have been instances reported in the literature where the breakdown potential for Nb and Ta in seawater has been found to be lower than the generally accepted value of 120 V, with reported values in extreme instances as low as 20- V . This has been attributed to contamination of the niobium surface from machining operations, grit blasting or traces of copper lubricant used in anode manufacture. These traces of impurities, by becoming incorporated in the oxide film, decrease its dielectric properties and thus account for the lower breakdown voltage. Careful control of surface contamination in the manufacture of platinised niobium is therefore essential to minimise the lowering of the breakdown potential of niobium. 

All sliding friction forces are dramatically affected by surface contamination. If the surface is covered with a material that prevents the adhesive forces from acting, the coefficient is reduced. If the material is a liquid which has low shear viscosity the condition exists of lubricated sliding where the characteristics of the liquid control the friction rather than the surface friction characteristics of the materials. It is possible by the addition of surface materials that have high adhesion to increase the coefficient of friction. 

In the process industries, chemicals are converted into other chemicals in a well-defined and well-controlled manner. Uncontrolled chemical reactions occur under abnormal conditions, for example, malfunctioning of the cooling system and incorrect charging. Temperature, pressure, radiation, catalysts, and contaminants such as water, oxygen from air, and equipment lubricants can influence the conditions under which the reactions (controlled and uncontrolled) take place. 

Use Corrosion control, contamination prevention, insulation, electrical equipment, molded and fabricated industrial equipment, lubricants, gyro and damping fluids. Especially useful under extreme conditions, including jet and space technology. 

Corrosion Control. Surfaces that become wetted by a lubricant and its additives are typically much less prone to corrosive damage from water, acids, bacteria, and other similar corrosion agents. Additives can neutralize acids as well as form a barrier film, which repels water and other chemically aggressive contaminants. 

Contamination can be defined as any unwanted substance or energy that enters or contacts the oil. Contaminants come in many forms and may be highly destructive to the lubricant, its additives, and machine surfaces. It is often overlooked as a source of failure because its impact is usually slow and imperceptible. While it is impractical to attempt to completely eradicate contamination from in-service lubricants, control of contaminant levels within acceptable limits can be accomplished and is vitally important. 

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