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Part 45 has been removed due to audio issues during recording. A higher-quality version will be uploaded in the future.

Glad you found it helpful! Let me know if you have any questions or topics you'd like to see covered.

I’m glad you liked it! More great content is on the way. 😊

Ah, the poetic critique is much appreciated! If only Parsons, Ljungstrom, and DeLaval had RUclips-imagine the debates in their comment sections. But hey, if this one didn’t cover it all for you, there’s a whole playlist waiting. And since you clearly have all the answers, I’m sure your 43-subscriber channel is a treasure trove of wisdom. Can’t wait to be enlightened, legend.

Great questions. FZG refers to a gear scuffing test method developed at the Forschungsstelle für Zahnräder und Getriebebau (FZG) in Germany. It is commonly used to evaluate the load-carrying capacity and scuffing resistance of lubricating oils, particularly for gear applications. In your case: FZG = 9: This indicates the scuffing load stage in the FZG test. A rating of 9 means the lubricant can handle moderate to high levels of gear contact stress before failure. PRT (or Part Running Time) = 1700 hours: Refers to the total operational hours of the lubricant in service. VVRT (or Variable Viscosity Running Time) = 456 hours: Refers to the time under varying viscosity conditions, such as high-temperature or high-load operations.

@@RotorDynamics Appreciate for such a detailed explanation! Thanks for sparing your valuable time.

@ You're very welcome! Glad I could help.

Thanks for the encouragement! Glad you're enjoying the series.

Good question. Without the Non-Drive End (NDE) bearing installed, the rotor still needs support within the casing to prevent excessive movement, misalignment, or contact with stationary components. The methods for temporary rotor support typically include: 1. Drive End (DE) Bearing Only - If the DE bearing is installed, it may provide partial support, but this alone is usually insufficient for proper alignment and stability. 2. Temporary Support Structures - These can include: a) Assembly Jigs or Fixtures: Custom supports designed to hold the rotor in place during installation. b) Soft Supports: Such as rubber or polymer inserts, acting as temporary cushions within the bearing housing. c) Dummy Bearings: Temporary radial bearings used to support the shaft until the actual NDE bearing is installed. 3. Labyrinth or Journal Clearance Fit - In some cases, a close-clearance labyrinth seal or journal section within the casing can provide minimal radial support. 4. Magnetic or Air Lift - In specialized systems, magnetic levitation or air pressure may be used to prevent shaft contact before final assembly.

You're welcome 😊

No both are on a disc...

I appreciate you watching!

Great suggestion! Will do.

Thank you so much for your kind words! I’m really glad you found the information helpful. If you know anyone else who might benefit from it, feel free to share the video with them-it would mean a lot! 😊 Thanks again for watching and supporting the channel!

I'm glad you enjoyed it!

I'm glad you found it helpful! I'll definitely add more steam turbine operation and troubleshooting content to my channel.

I appreciate you watching!

Glad you enjoyed it.

Thank you for your thoughtful questions! Let me address each one in detail: Contact Seals During Cold Shutdown: During cold shutdowns, many steam turbines employ mechanical contact seals, like carbon rings or seal blocks, to minimize air ingress and prevent leakage of residual steam. These seals also help limit the exposure of internal components to ambient air, reducing the risk of corrosion. Purging and Corrosion Prevention During Shutdown: For extended shutdowns, it’s common to purge the system with inert gases like nitrogen or dry air to eliminate moisture and water vapor, thus preventing corrosion. Some operators may also inject anti-corrosion additives, such as protective oils or vapor-phase corrosion inhibitors (VCIs). Pre-Heat Process During Startup: Yes, pre-heating the turbine is a critical step during startup to address condensation issues. This is typically achieved through "warming lines" or auxiliary steam that heats the casing and internals to a temperature above the dew point, ensuring that any residual moisture is evaporated. This process also reduces thermal stresses on components during startup, enhancing reliability.

Thank you very much! :)

Love the energy!

Thank you. If you enjoyed the video, feel free to share it with your colleagues who might find it beneficial.

I'm glad you liked it.

Thank you for the suggestion! I'll add a video explaining the difference between balance drums and pistons to my list.

I appreciate you watching! :)

Thank you!

Should not it be a synchronous one if its cause is vane passing frequency? Like #ofvanes × shaft speed? ​@@RotorDynamics

@@RotorDynamics So root cause of this failure is not the sub-synchronous vibration right? How did you observe sub-synchronous vibration in this case? Why? Did you manage to address sub-synchronous vibration root cause?

I’m not entirely sure I understand your question. Please feel free to email me for further clarification: rotordynamics101@gmail.com The main issue here is that the impeller blade’s natural frequency coincides with the vane passing frequency.

Thank you for the kind words and thoughtful feedback! 😊 For top casing and rotor centering, it's definitely a crucial aspect of the process, and I'll make sure to include a detailed explanation in a future video. A comprehensive video covering this topic sounds like a great idea-I'll add it to my list to help professionals like you. Stay tuned, and feel free to share any other suggestions or questions you have!

@RotorDynamics Appreciate.... Keep it up!

Thank you so much for the kind words! 🥰 I'm thrilled to hear that you're passionate about turbines and open-source energy generation-such exciting and impactful work! If you have any questions or need guidance as you work on your project, feel free to reach out. Best of luck making your dream a reality! 💪⚙️

@@RotorDynamics Awesome, thanks !! 🤗

Thank you for sharing this insight! Carbon rings are indeed a practical choice for lower shaft surface speeds due to their effectiveness. I’ll be covering mechanical seals in an upcoming video, so stay tuned for more insights!

Absolutely! Seals play a critical role in ensuring efficiency and reliability in high-performance turbomachinery. Thanks for highlighting this!

You're welcome! 😊 Glad you found the video helpful! Let me know if you have any questions or suggestions for future topics.

I'm glad you liked it, feel free to share it with others!

Thank you for your kind feedback on the video! I'm glad you found it informative. You’ve asked some excellent questions about sleeve bearings and foil bearings. These are nuanced topics that involve detailed analysis of factors like lubrication regimes, load capacities, and design trade-offs. I’d be happy to discuss these in more depth. For a more detailed conversation, please feel free to reach out to me via email at rotordynamics101@gmail.com

Thank you for your question and for watching the video! You're absolutely correct-foil bearings generally require a specific mounting orientation and rotation direction to function optimally. These bearings are typically designed for a preferred rotation direction, as the geometry and preload are optimized for stability under those conditions. While they can handle reverse rotation to some extent, they may quickly become unstable due to the lack of proper hydrodynamic pressure generation. Additionally, the load direction is indeed a critical consideration. Foil bearings are designed to support loads in specific orientations, and incorrect loading can compromise their performance or stability. If you found this explanation helpful, feel free to share it with your colleagues who might also be interested in foil bearing design. I appreciate your engagement and thoughtful feedback!

​@@RotorDynamics Thank you for your reply and explanation, it is very helpful. For the bearings shown in the video, can you give a recommended load direction? Because at 1:45 of the video, the photo and the schematic show different angles for the foil bearings, and there is about a 30° difference between them(assuming gravity is all vertical down), which is better ?

Thank you for your kind feedback! I appreciate your attention to detail regarding the foil bearings. For a thorough discussion on load direction and the differences observed, I recommend emailing me directly at rotordynamics101@gmail.com. I’d be happy to clarify further there.

That's a great question! Addressing misalignment can be tricky and often requires specialized tools and procedures. If the radial clearance isn’t within OEM tolerances: Check measurements - Confirm readings to rule out errors. Inspect diaphragms - Look for wear or misalignment and verify they match OEM marks. Reposition - Loosen bolts, align with tools/shims, and adjust the diaphragms. Check the rotor - Ensure it’s centered and has no runout before finalizing. Tighten & recheck - Gradually tighten bolts and remeasure clearances. Spin the rotor manually to ensure no rubbing. Test & log - Do a test run and document adjustments. If the problem persists or parts are damaged, consult the OEM or consider replacements. If you found this explanation helpful, feel free to share it with your colleagues who might also be interested in rotating machines. I appreciate your engagement and thoughtful feedback!

@RotorDynamics Thanks a lot for your kind response 👍 🙏🏻

You're welcome! I'm glad you found the video helpful.

Thank you for checking out the video! I'm thrilled you found it helpful. 😊 Feel free to share it with your colleagues if you think they'd find value in it too.

Hi Ali - thank you for stopping by. :)

Thank you for your suggestion. Sure, I will cover the mechanical seal system in a future video. If this video was useful, please feel free to share it with your colleagues. :)

You’re right, choosing a different number of vanes can help minimize resonance, but it can impact (reduce) the flow efficiency. The number of the vanes is defined based on CFD analysis. So, if you want to change the number of vanes, further CFD analysis is always recommended.

Thank you for your suggestion! Compressors are a fascinating topic, and I’m glad to see your interest in them. I’m currently planning future videos, so I'll definitely consider diving deeper into specific aspects of compressors. If you have any particular areas or questions in mind, feel free to share! Also, please share my channel with your colleagues who might find these videos helpful.

Thank you! I'm glad you enjoyed the video. Your support means a lot! Feel free to share it with others who might find it helpful.

Great question! Varnish caused by electrostatic discharges typically results from the buildup of electrical charges on surfaces, leading to localized heating and breakdown of insulation materials. Signs include discoloration, unusual wear patterns, or degradation of insulation around (near) electrical components. It can be confirmed through testing, such as conduct oil analysis to check for byproducts of ESD, such as specific contaminants or degradation products. And, also inspecting for arcing marks. Would you like more details on detecting this? :)

@RotorDynamics that's cool thanks! Yes, I would like to know more if there is a video

Thank you! I'm glad you liked the video!

Thank you for your kind words and for such a great question! 😊 The pocket pass frequency (PPF) and lobe pass frequency (LPF) differ because they represent distinct mechanical and flow phenomena in a root blower. Lobe Pass Frequency (LPF): This is the frequency at which the lobes pass a fixed point, like the discharge port. It's directly tied to the number of lobes and the rotor speed. LPF=Number of Lobes×Rotor Speed Pocket Pass Frequency (PPF): This relates to the interaction of the spaces (or pockets) between the lobes and is typically Number of Lobes - 1 × Rotor Speed. It's important because it often corresponds to airflow pulsations or pressure fluctuations, which can impact blower performance and noise levels. If you have a 3-lobe rotor, for instance: LPF = 3×Rotor Speed PPF = 2×Rotor Speed This difference arises from the geometry and how air is transferred through the blower. Monitoring both frequencies can help diagnose different aspects of blower performance-vibration from lobes and flow pulsations from pockets. Let me know if you'd like me to dive deeper into this! :)

Thanks for the great suggestion! Journal bearings are definitely an interesting topic with a lot to cover, and I’ll add this to my list for future videos. In the meantime, I already have some videos on different types of bearings you might find useful: Part 25 covers sleeve bearings (journal bearings), Part 26 dives into squeeze film dampers, Part 21 explores herringbone grooved bearings, and Parts 16 and 17 focus on foil bearings. Let me know if there’s a specific type of journal bearing or application you'd like me to go deeper into!

Thank you! I really appreciate your support. Let me know if there's anything you'd like to see covered in future videos.