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Intermittent high vibration and phase change on DE bearing of 24 MW Generator
Registered Member Can you share the full spectrum waterfall also to identify the rubbing or load shifting issues. [ more ]
Registered Member I'm sure you have checked but could you share if anything else has changed? Bearing temperatures, oil pressure, ambient conditions, etc. To discount the Morton effect completely, try changing the oil temperature and see if this has an effect. If you have access to an ultrasonic analyser, try taking the output from the ultrasonic unit into your vibration analyser and use the demodulator (Peak-Vue) function - that will more readily identify if there is a mechanical rub. [ more ]
Registered Member Dear RG, Plots have been attached for your reference. Maximum amplitude of vibration during these events is not increasing with time at steady state normal operation. However, it has been observed that frequency of occurrence of these events is increasing. No abnormality found in gap voltages. During these events vibration increases gradually. Best Regards, [ more ]
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INCREASE VIBRATION WITH TIME IN A CENTRIFUGAL COMPRESSOR
Registered Member It looks like you potentially have about a mil of slow roll so I would suggest you compensate the data so that have a better feel for the dynamic motion. Compensate your shaft centerline plots as well. I see the data is in mils but your profile indicates Mexico. Isn't Mexico on metric? [ more ]
Registered Member I think the alignment is probably not a problem in this case. the data you take for two time of running so it is a little bit to evaluate it. I would like to ask for some information before giving my ideal: 1. what type of gas seal installed (some type of DGS have barrier with cacbon seal)? 2. How about critical speed of the machine? 3. Could you correlate the speed, vibration trend and temperature for easy seeing of their relationship? 4. Could you plot the waterfall and APHT plot for... [ more ]
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Welcome to AMPCertified Reliability Leader (CRL) Forum
I would love your advice on Augury's new product
Registered Member Yair, I am a prior maintenance and facilities manager that is in a reliability engineering role now, and managing our plan's PdM program. I am in the process of evaluating our program and looking to streamline, upgrade, consolidate. I'll be glad to take a look at what your offering is and give any relevant feedback. Regards, Michael Meehan [ more ]
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Welcome to AMPCertified Reliability Leader (CRL) Forum
Reliability Leader: Profoundness of Language
Registered Member All of these comments strike a chord in me but none help with my current quandary. I'm trying to implement an Asset Maintenance initiative company wide and am trying to figure out how to engage business lines that don't fall in the "normal" realm of AM. For example how do I keep the folks from our construction side engaged in the conversation or those from our corporate business offices? Any ideas? [ more ]
Registered Member Another way in which language can be profound is in how we use it to set goals. I was considering, over the weekend, the difference between an organization geared to "reduce downtime" versus one tasked with "maximizing uptime". I believe the more positive language, working toward MORE of something is better from a leadership perspective. Trying to obtain more of something is simply more "active" than trying to get less of it's opposite. Trying to gain spurs people on whereas trying to lose... [ more ]
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High vibration in Fan Non DE bearing Horizontal direction
Registered Member To prove you do not have loose fits, use a long bar/block of wood/dial indicator. Put indicator at top dead center of the shaft and lift the shaft. If you have more than .003-.005" of up and down play, something is worn/loose The harmonics in you vibration data indicates looseness, sources of looseness could be bearing fit to shaft or housing, loose bearing housing feet, loose fan base, worn coupling, fan wheel loose on shaft to name a few areas of interest Have seen 3x come from loose... [ more ]
Registered Member Looseness is probable. Looseness could be between parts that are inspectable externally or it could be an internal problem that can only be verified by opening the parts. Example is bearing inner race OD and shaft. In my word, amplitudes like 24 mm/sec are too high to keep the machine running or keep the operators check the machine. Safety is important. Have you inspected the lubricant (drained the oil to check it)? Any observations like unstable reading, noise, high temperature were... [ more ]
Registered Member Agree with Jim...I would even put the analyzer on live mode and stick prob at different spots on base frame and look for any sudden change in amplitude. Lot of times welding cracks are hard to identify just by looking. [ more ]
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High vibration in Fan Non DE bearing Horizontal direction
Registered Member This would be my approach: What maintenance was done. What were vibration before and after maintenance. how do the FFT compare before and after. Scan all bolted flanges with FRF and check phase across. It would not hurt to do impact test to identify structural natural frequencies. Do phase analysis across entire train especially coupling to check for any misalignment. [ more ]
Registered Member I assume NDE is the fan bearing bearing next to the fan wheel? Is this a direct drive or belt drive fan? What is the fan operating speed? Any phase data? Have you balanced the fan? Have seen this vibration pattern be pure imbalance due to weak bearing supports. See anything around the bearing supports that looks rusty in color like metal to metal contact or metal to concrete contact. Could the fan bearings not be in proper alignment with each other? Either side to side or vertically? Is... [ more ]
Registered Member Okk thank you sir... I will check as you recommended.. [ more ]
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Welcome to AMPEpic Failures Photo Album
Perfect PM Compliance
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Registered Member I think the more important thing to note is that this is a Fire Riser valve, and as such should be definitely PM'ed for real, and correctly at all times. This belies an attitude of disregard not only for routine maintenance, but for the condition of safety-related systems. I would not care to work in that environment other than to be given the opportunity to make it safe and reliable. [ more ]
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Welcome to AMPEpic Failures Photo Album
Bearing failure at 36,000 RPM
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Registered Member Wow, this is a disastrous amount of damage. What was the cause of bearing failure? If you don't mind what is the rotating mass, and what is the power for the unit? [ more ]
Registered Member Turbomolecular pumps are used mostly in scientific and semiconductor processes for high-vacuum creation. They are usually supported by mag-lev bearings and any failures, i.e. particulate ingestion, loss of power to the bearings, etc are usually quite catastrophic. Using mag-lev bearings makes vibration monitoring a non-productive task. Visual inspections will reveal very little, and because of the nature of trying to get a system back to high-vacuum once exposed to water vapor in the... [ more ]
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Asset Hierarchy
Registered Member Vinman, Well if you have a template for a boiler room or chill water plant, I wont turn it down! Thank you, Kind Sir. Jim [ more ]
Registered Member Great to hear that Jim. ISO 14224 is more relevant to Oil and Gas Industry but is more universal in nature to be applied in other industry verticals. Wish you the best for your journey to organise the asset hierarchy. Shout out to me in case you need help me with the processes and templates. [ more ]
Registered Member Thank you, Vinman I have seen a lot of Uniformat II being used for smaller plants but its just not valid for a plant system because we do not use 90% of the hierarchy. This ISO 14224 seems to cover the bases and more. [ more ]
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How does a new user post to resumes?
Registered Member She got an email confirmation request and she needs to click the link. Check spam folder [ more ]
Registered Member How does she confirm her membership? [ more ]
Registered Member She can post the job in the ReliabilityResumes Forum as soon as her membership is confirmed. No need to wait. There is also a free job posting at http://www.reliabilityresumes.com [ more ]
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High Vibration
Registered Member If some kind of rotor asymmetry is causing vibration oscillation of at pole pass frequency during solo run, vibration will vary very very very slowly (pole pass period might be 30 minutes). Rotor asymmetry could include a static bow or a dynamic bow (operating near flexible rotor resonance) or excess bearing clearance or (less likely) rotor bar problem. by the way, we don't know anything about your machine (horizontal/vertical, bearing type, which direction was 1x measured). [ more ]
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Bearing defect Frequency FAG 508731A
Registered Member Thanks for the reply. however at this stage I do not know the number of balls on this bearing. I tried looking at Schaeffler's website but to no avail. [ more ]
Registered Member A relatively close estimate I sometimes use is for; Inner Race Defect = 60% x rpm x # of Balls Outer Race defect = 40% x rpm x # of Balls Cage = 1/2 - 1.2/Nb x rpm Hope this is some help. [ more ]
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Kone Heavy Duty Airport passenger Elevator Rope Defects
Registered Member Thank you so much Mr. Walt. [ more ]
Registered Member The Microlog may not be the best instrument for this application, so you will have to get creative using its features or consider purchase of a more appropriate instrument. Search: machine condition measurements for elevators Ride Quality Measurement & Analysis for the Elevator/Escalator Industry Pasted from < http://www.pmtvib.com/index.ph...;id=12&Itemid=30 > EVA Vibration Analysis Tools Software Pasted from < http://www.pmtvib.com/index.ph...;id=16&Itemid=39 > Be... [ more ]
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Old topics disappearing
Registered Member Good, thanks a lot. [ more ]
Registered Member I made a discovery with good news! It looks like the "issue" here is that we just have some old bookmarks or links that are no longer valid. The URLs you have are in a format that were deprecated over two and a half years ago in the SEO Ninja Release of the platform software. So, here's a mapping of the "fixed" URLs: Broken: http://www. maintenance.org/top... 64439074#70920918763 Fixed: http://www.maintenance. org/top...64439074#70920918763 Broken: http://www. maintenance.org/top... [ more ]
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Advanced search?
Registered Member Thanks guys. Yeah, I was confused by the change in layout. [ more ]
Registered Member El’Pete, It looks like the Forum Web design changed recently!! The Search and Advanced Search can be selected from the gray title bar with the “little” magnifying glass icon to the right of Blog. Move you cursor over this to see the Search choices. This Forum layout is worse than the previous that had the useless Birthdays listed, but at least it had a list of recent posting across all of the categories. Removing this recent postings list and burying the Search fields really is not... [ more ]
Registered Member Actually, if you want to also search on keywords, you can define the member content separately at the Advanced Search screen. Go to "Search" in the top left corner, then select "Advanced Search" at the top right of the next screen. At the Advanced Search screen you have several choices as to key words you might desire in your search. Scroll down a bit and you'll find the choice "Posted By" and to the right of that in light blue you'll find "Choose Member Name"; click on Choose member Name. A... [ more ]
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5000 ton cooling tower gear box
Registered Member Seems erratic so try https://www.maintenance.org/for...ion-and-oil-analysis [ more ]
Registered Member Link doesnt work John From PA [ more ]
Registered Member Yes, it likely will come down in the oil level sight glass. You should determine if the OEM specifies the level with the machine shut down, running, or in a few instances both. The machines I have worked with have the oil level gage outside the tower and a means to add oil from a position outside the tower. How much it varies is a function of the specific gearbox so if your next question is to ask "how much lower will it be?", don't expect a reliable answer, just "guessestimations". By the... [ more ]
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AMP Events area, birthday listings
Registered Member Originally Posted by Reliability: We hear you loud and clear but we want to try the birthdays for a little while - to see if we can create some wider commnication and connection. We know it is not facebook (we were here first) but there is something connective about acknowledging best wishes on a birthday. You can view the calendar without birthdays by 1) Clicking Calendar LInk 2) Using the drop down menu to choose CRL events 3) Or you can subscribe to iCal The site is planning major... [ more ]
Registered Member I would not be interested in changing anyone's opinion about what these forums are because making your own meaning is what makes them so cool. I can state 100% clearly that these forums have been delivered as a service to the community and costs have never been covered. If it's a business - it's a bad one! Maybe I should start a vibe service company! That said we are crystal clear that there are a world of options out there for people to relate, network, share etc.... I am active in some of... [ more ]
Registered Member Keep in mind John, that this forum is not provided as simply a "service" to our community, but is a business. It's about page views and ad clicks, and to grow revenue they have to expand the user base. So while we benefit, profit is still important. And so a balance has to be struck between growing the user base, and "running off" the people who have made this board successful. What if the top 40 or 50 posters here simply went somewhere else? That's doable you know. [ more ]
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Initial screen opening with an Android device
Registered Member This and a few other issues were reported early on with the change to the new board format, perhaps late August or September. We were told some changes would be coming in October but this apparently isn't one of them. Are changes taking place? Are the issues expressed by others being addressed? The use of an Android device is particularly frustrating. In some previous instances I posed that I could not seem to reply but I've actually learned that in many instances clicking on a particular... [ more ]
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Welcome to AMPBook and Article Discussions
Audit it. Improve it! Getting the most from your vibration monitoring program
Registered Member All MRO-Zone books are available with a 30-day money back - even from Amazon.com I just re-read this book - and yes, our company is the publisher, so we are huge fans of Alan's work, but I think this book and workbook is a must read for anyone managing ANY type of condition monitoring program. If you have read the book and agree - please post a review at Amazon.com to encourage Alan to keep writing and to spread the word. [ more ]
Registered Member Thanks for your interest. I am sorry, but I don't have parts of the book in a format I can share. You can purchase here though: http://www.amazon.com/Audit-Im...rogram/dp/1941872247 [ more ]
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Changing profile, settings etc.
Registered Member I also think that procedure is a bit overkill, how many stolen Id´s the last 5 years? Olov [ more ]
Registered Member We are alert to Chinese hackers - so we erred on the side of security - hoping it would not be too big of an inconvenience and that profile changes would settle. We would like to stay "over secure" for now but may loosen up as time goes by. We apprecite all your comments and your testing. We are getting to know the tech support team pretty well :-) [ more ]
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