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Pump Vibration
Registered Member With high water level in the pit, natural frequency does not change. Vertical looseness goes away with high water level. it reduces damping and amplification factor increases. This explains why vibration amplitudes amplify with high water level in the pit. I will return to site in coming weeks. I will share more information later. [ more ]
Registered Member If 1X changes due to water level only, consider the effect of added mass to the entire pump system. This may explain a change in Fn. Hard to know for sure without a more complete ODS..... Have you considered a bump test for Fn at several different water levels? Regards Jim P [ more ]
Registered Member Thanks guys, I think I know what’s going on. I will present my conclusions later. [ more ]
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Impact of shop-floor balancing on in-suit dynamic balancing
Registered Member @Registered Member If 1x is dominant check the cross-phase between the vertical and horizontal. If 90 degree at each bearing, dynamic balancing should be an excellent tool to reduce the vibration. [ more ]
Registered Member Yes, we are working on other parameters such as ESP & process related issues. In spectrum it is only 1X component is observed. Both motor & fan bearings are journal bearings. [ more ]
Registered Member This is a "Yes, but..." type of questions. Theoretically, Insitu balancing would be the same as shop balancing if the 1X component in-situ is guaranteed to be only from unbalancing forces. Shop balancing ensures the above to great certainty. In site, 1X components can be a summation of misalignment, looseness, or other forces than just imbalance. This is maybe why the fan vibration is not reduced by balancing in the site, the problem can be anything else. Still, it was a wasted opportunity... [ more ]
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Ingersoll Rand Compressor MM-250 Frequent Failure
Registered Member Hi! Y7. We have four such units at our site which normally gives 1 year useful life. There are number of contributing factors for failure. Dominant mode of failure is High Vibration. Can you kindly answer my following questions: 1- Are your units direct drive rigid transmission? If yes then does these have soft starters of DOL operation? 2- What is air quality level? How frequent you are replacing air filters? Are you using filters from OEM? 3- What's the duration for separator element... [ more ]
Registered Member Hi Fahad, IR engineering teams nearest hub to you are in UAE and Italy. I have some contacts. It will be good if you share more details about bearing failure under the thread, IR air compressors are common, we have 10 units of similar model. [ more ]
Registered Member One source I find on line states that the machine is rated to 46°C (115°F). If this machine is outdoors in sunlight I could see where the ambient temperature might be a factor. [ more ]
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Edit and Delete Functions on the Forum
Registered Member Dear Ali, thank you for your email and request. Please notice we changed the functions to control the content and integrity of the forum. Please do let me know maura@maintenance.org the information you need me to edit/remove. Thanks in advance and please keep safe! Sincerely, -- Maura Abad Global Relationship Leader and Director of Women in Reliability and Asset Management Association of Asset Management Professionals Tel: (239) 533-9806, Ext 102 bill@reliabilityweb.com /" rel="noopener... [ more ]
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Dry Gas Seal on General Purpose Steam Turbines
Registered Member I suspect that you are considering to change from carbon seal to DGS used for steam turbine 1 stage. Before changing to use another kind of sealing method, you need to conduct Hazop analysis. the risk could be from Installation, leaking, material plan... In case of seal failed, the leaking, of course, is a problem. Together it, reducing performance, vibration, temp... could happen. you should base on seal OEM recommendation and monitoring/recorded data to decide when you should replace. [ more ]
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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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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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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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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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working definition for situational maintenance
Registered Member Has you further checked on the book eg in the library? [ more ]
Registered Member Thanks for your responses, Candy. I saw that reference also, but I didn’t get much out of that description … did you? Tim [ more ]
Registered Member Online search gave this: The role that effective maintenance management plays in contributing to overall organizational productivity has received increased attention. Presents the development of a situational maintenance model that may be used to analyse and design the elements of a maintenance system. The situational approach to maintenance builds on contingency theory and considers both internal and external corporate dynamics. Using ideas from total productive maintenance (TPM), discusses... [ more ]
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Cant access post
Registered Member Works fine for me in Chrome. Try a different browser. It's difficult to do a website that works with every browser out there. [ more ]
Registered Member Terrence, The following is the post I was having issue accessing, it repeated the error again. http://maintenanceforums.com/e...=729108343#729108343 Regards. [ more ]
Registered Member Nothing shows up for me when I search the forums. Do you have a direct link? Terry O Forum Moderator [ more ]
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How can I tell if thread has new content
Registered Member I'm guessing that "NEW" indicates new content, and "First Unread Post" may be significant. [ more ]
Registered Member Agree e'pete, something was in the old board that was an indicator of topics we had visited or "new" topics that were not previously visited. I now wish I had taken some screen shots of the old board to see what really may be missing and what may just need to be accomplished in a different manner. I have found that you can click on "Activity" on the top toolbar and get a summary of all active topics. I participate in another forum where topics I've never read are in bold, changing to a... [ more ]
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