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Turbine lubricating oil: New filtration advances save time and money

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Turbine lubricating oil: New filtration advances save time and money

Release date:2018-03-05 15:14 source: clicks:

Benefits of filtration advances include fewer forced outages, faster startups and reduced bearing wear The importance of clean lubricating oil for turbines has been recognized for a long time, and almost all generating plants use some type of filtration system. Many older technologies and systems cannot remove enough of the contaminants to meet the needs of today's turbines and operating conditions. Newer filtration technologies, such as multiphase filtration systems incorporating pressure coalescence filters to remove water, can reduce contaminants to levels that will help prevent unscheduled or forced outages, allow faster startups after an ongoing outage, and reduce wear of bearings and other components. Such preventive measures are more important than ever because of today's increased competition and emphasis on cost control. The 1992 Energy Policy Act, which requires regulated utilities to transmit or "wheel" power to wholesale buyers, has caused many power companies to re-evaluate their operating costs and capital budgets. Current proposals would have additional impacts. The Federal Energy Regulatory Commission's open-access transmission ruling will further affect the transfer of power between investor-owned utilities and wholesale customers. A number of states are implementing retail wheeling policies which will take effect in the near future. These new regulations mean changes in electric power demand that will require cycling of generators, rather than the traditional operation of steady mainline and separate peaking generators. Cycling puts more stringent requirements on the turbine oil lubrication system and the filtration system. As a turbine coasts down from synchronous speed to turning-gear operation, the thickness of the oil film decreases. If the oil is contaminated, particles can be forced between the journal and the bearing, resulting in excessive wear or scoring. An effective filtration system must meet two basic requirements: 1. The system must be able to remove both water and particulates, including smaller particulates. 2. The system must process the volume of the oil reservoir in a short enough time to keep contaminants to acceptable levels, now considered to be two hours or less. Lube oil rating systems Recommendations for lubricating oil cleanliness are now stricter than they were in the past. Several rating systems are currently used to indicate the level of contaminants in oil. Because the systems have different class numbers for the same level of contaminants, it is important to know which rating system is being used. The International Standards Organization (ISO) Class 16/13 standard [old Society of Automotive Engineers (SAE) Standard Class 4] for solid contaminants is recommended by the Electric Power Research Institute (EPRI) and some turbine manufacturers. Some power companies and testing laboratories use classes defined by the SAE or those of the National Academy of Sciences. Some companies that perform routine oil tests in their own laboratories use modifications of these standards. Rating of filters that remove particulates are usually expressed as Beta ratios per American National Standards Institute.

Related Tags:oil filtration,turbine oil filtration,lubricating oil filtration,hydraulic oil filtration,transformer oil filtration

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