Skip to main content

MaintenanceForums

Sorted by last update

Welcome to AMPForum help
Introductions
RM Registered Member
Registered Member Hello , I recently did the certification of CRL previously Certified API 510, API-570, API-653 Inspector, Machine Diagnostics and VA-II Certified, Professional Trainer with 18 years of experience of Inspection, vibration analysis,Machine diagonistics, Piping and pressure vessel designing, Project management, Vibration analyst , Lead Auditor, Business Advisory and social work . Providing the vibration analysis services to KE, ENI and EPCL, more than 100 analysis completed, work for renowned... [ more ]
Registered Member Good to have ya! We are each the current final product of every technician, engineer, mentor, and teacher we learned from. As they all were from thier educators. This forum is the baby from all who contribute here. The vast decades of learning and searching for an answer is at your fingertips. [ more ]
Registered Member yea, it indeed helps us to solve delicated & complicated problems that we face. [ more ]
See all 5 replies...
Welcome to AMPForum help
Gearbox Sleeve Bearing temperature rise on decreasing load
RM Registered Member
Registered Member I don't have a picture to share at the moment. However, I can tell you that the varnish is likely forming due to a combination of factors, including the age of the oil and the operating conditions of the bearing. On these essay paper reviews I found out that in terms of the relationship between high temperature, varnish, and low load, it's possible that the low load is causing insufficient oil flow, which in turn leads to varnish formation and high temperature. That's just a hypothesis,... [ more ]
Registered Member The rising temperature of the sleeve bearing is likely due to oil varnishing leading to clearance issues. Another possibility is that there could be a problem with the lubrication system, such as a clogged oil filter or restricted oil flow. It could also be an issue with the bearing, such as a damaged or worn one. I recommend performing a detailed inspection of the lubrication system and the bearing and possibly performing an oil analysis to determine any contaminants in the oil. [ more ]
Registered Member The load change would make shaft position change --> clearance change --> change temperature. How about shaft centerline? [ more ]
See all 6 replies...
Welcome to AMPForum help
High vibration in Fan Non DE bearing Horizontal direction
RM Registered Member
Registered Member Me too. and it was a big clearance between bearing and shaft. I started in 2018 announcing a problem with a bearing-to-shaft clearance because when we changed the bearing the shalf was damaged. of every time I have talked about this problem but nobody believes me. in 2020 we saw the shalf floating into the bearing! the bearing nd end in origing was blocked but now the axial vibration was very big. [ more ]
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 ]
See all 13 replies...
Welcome to AMPForum help
Pump Vibration
RM Registered Member
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 ]
See all 13 replies...
Welcome to AMPForum help
Impact of shop-floor balancing on in-suit dynamic balancing
RM Registered Member
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 ]
See all 3 replies...
Welcome to AMPForum help
Ingersoll Rand Compressor MM-250 Frequent Failure
RM Registered Member
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 ]
See all 7 replies...
Welcome to AMPForum help
Edit and Delete Functions on the Forum
RM Registered Member
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 ]
See 1 reply...
Welcome to AMPForum help
Dry Gas Seal on General Purpose Steam Turbines
RM Registered Member
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 ]
See 1 reply...
Welcome to AMPForum help
Intermittent high vibration and phase change on DE bearing of 24 MW Generator
RM Registered Member
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 ]
See all 6 replies...
Welcome to AMPForum help
INCREASE VIBRATION WITH TIME IN A CENTRIFUGAL COMPRESSOR
RM Registered Member
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 ]
See all 2 replies...
Welcome to AMPForum help
High vibration in Fan Non DE bearing Horizontal direction
RM Registered Member
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 ]
See all 7 replies...
Welcome to AMPForum help
Asset Hierarchy
RM Registered Member
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 ]
See all 4 replies...
Welcome to AMPForum help
How does a new user post to resumes?
RM Registered Member
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 ]
See all 3 replies...
Welcome to AMPForum help
High Vibration
RM Registered Member
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 ]
See 1 reply...
Welcome to AMPForum help
Bearing defect Frequency FAG 508731A
RM Registered Member
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 ]
See all 2 replies...
Welcome to AMPForum help
Kone Heavy Duty Airport passenger Elevator Rope Defects
RM Registered Member
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 ]
See all 2 replies...
Welcome to AMPForum help
Old topics disappearing
RM Registered Member
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 ]
Registered Member ❤️
See all 6 replies...
Welcome to AMPForum help
Advanced search?
RM Registered Member
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 ]
See all 4 replies...
Welcome to AMPForum help
5000 ton cooling tower gear box
RM Registered Member
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 ]
See all 3 replies...
Welcome to AMPForum help
AMP Events area, birthday listings
RM Registered Member
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 ]
See all 7 replies...
Welcome to AMPForum help
Initial screen opening with an Android device
RM Registered Member
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 ]
See 1 reply...

Join Us!

The Association for Asset Management Professionals (AMP) is dedicated to making the world work for everyone, with no one left behind.

The mission is to provide a path to a safe, sustainable, successful workplace and world through reliability and asset management.

AMP is a Florida based 501 (C3) not-for-profit organization that delivers

  • Professional Certification (CRL and CMM)
  • Online Community of Knowledge
  • Competency Based Learning (CBL)
  • virtual Special Interest Groups (vSIG)


 This web site is FREE to use for registered members and has been called the LinkedIn or Facebook for Reliability Leaders and Asset Managers.  The Community of Knowledge is simply fantastic.

The Association of Asset Management Professionals (AMP) is licensed to develop competency based frameworks using Uptime Elements Reliability Framework and Asset Management System and its related Frameworks.

Uptime Elements Reliability Framework and Asset Management System
Uptime Elements Reliability Framework and Asset Management System

Uptime Elements Digitalization Framework
IoT Knowledge Domain

Vibration Elements
Vibration Analysis and Diagnostic Framework
Lubrication Elements
Asset Lubrication Framework

 You are also invited to join the Association of Asset Management Professionals

LinkedIn Discussion Group with 53.000+ members

https://www.linkedin.com/groups/1636387

LinkedIn Company Page as well
https://www.linkedin.com/company/association-of-asset-management-professionals

Join Now

Already a member? Sign In

Membership Required

We're sorry. You must be signed in to continue. Sign In or Register
×
Are you sure you want to remove from your Block List?
×
Loading...
×
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
×
Link copied to your clipboard.
×