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A lube oil strainer in a steam turbine serves a purpose similar to that of a lube oil filter, but it is typically designed to capture larger particles and debris from the lubricating oil. The primary purposes of a lube oil strainer in a steam turbine system include:
1. Initial Filtration:The lube oil strainer is positioned at the beginning of the lubrication system to capture larger particles and impurities that may be present in the oil. It acts as a preliminary filter before the oil enters more fine-tuned filtration systems, such as lube oil filters.
2. Protection of Downstream Components:By removing larger particles and debris, the lube oil strainer helps protect downstream components, such as pumps, bearings, and other sensitive parts of the steam turbine. This is essential for preventing damage and ensuring the reliable and efficient operation of the turbine.
3. **Prevention of Clogging:**   - The strainer prevents large contaminants from entering and potentially clogging more finely meshed filters or causing damage to critical components. This is particularly important in maintaining the functionality of the entire lubrication system.
4. Easy Maintenance and Inspection:Lube oil strainers are designed to be easily accessible for inspection and maintenance. Regular checks and cleaning of the strainer can be performed to ensure its effectiveness. This proactive approach helps identify and address potential issues before they can impact the turbine's performance.
5. Minimization of Wear and Tear:By capturing larger particles, the lube oil strainer reduces the risk of abrasive wear on the moving parts of the turbine, including bearings and journals. This, in turn, contributes to extending the lifespan of these components and enhancing the overall reliability of the steam turbine.
6. Continuous Flow of Clean Oil:The lube oil strainer contributes to maintaining a continuous flow of relatively clean oil in the lubrication system. While it may not capture the smallest particles like a fine filter, it plays a crucial role in preventing larger contaminants from causing disruptions or damage.
It's important to note that in many steam turbine lubrication systems, both lube oil strainers and filters are used in combination to provide comprehensive protection against contaminants of various sizes. The strainer acts as a first line of defense, and the finer filter(s) further refine the oil before it reaches critical components. Regular maintenance, inspection, and cleaning of both strainers and filters are essential aspects of ensuring the proper functioning and longevity of a steam turbine.

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