Skip to main content

MaintenanceForums

Sorted by last update

Welcome to AMPBook and Article Discussions
Vibration Analysis Level 1 (or 2) Practice Question Q 45
Registered Member Jake, Thanks for the chart. I've comments that might be useful for some readers. There is a fundamental difference between the two waveforms (in Jake's post) which is physics. To explain this, let us use a third illustration. [source: https://www.researchgate.net/f...ia-18_fig1_262450664 ] Jake's upper plot is the amplitude (elevation of a point of the string) in the y-axis versus the location of points (examples are A, B, C, etc) along the length of the string on the x-axis. So here we look... [ more ]
Registered Member Dear colleagues here a Vibration poster that might be of your interest. ( no cost to download) https://reliabilityweb.com/steal-these-graphics [ more ]
Registered Member Hi, here’s a good visual of exactly how to find the period or frequency of any graph. [ more ]
See all 3 replies...
Welcome to AMPForum help
BREAKDOWN MAINTENANCE POSTING BOARD
Registered Member I think it would also be useful as part of your site breakdown strategy that you have a management policy that every equipment breakdown that impacts on production is investigated using a Root Cause Analysis process that not only identifies corrective actions to get you back to where you were before the breakdown occurred , but also preventive actions that will prevent the breakdown or similar types of breakdowns from happening in the future [ more ]
Registered Member I think it better for newbie in maintenance field. My opinion about breakdown, if equipment breakdown it might be to restore back as soon as possible in the system by maintenance. But equipment have chance to failue as the same cause if reliability engineer's do not something. So, reliability engineer's must do something and economically concern as Josh saided. [ more ]
Registered Member First, where does or for which equipment does breakdown maintenance or run to failure strategy is applicable and economically viable option to do so? [ more ]
See all 4 replies...
Welcome to AMPCertified Reliability Leader (CRL) Forum
CRL training exam
Registered Member Hello Shabir Ahmad Khan - We see you have inquired about CMRP training. The CMRP is a certification administered by SMRPCO and not AMP. AMP has the Certified Reliability Leader (CRL) certification which is a 2-hour, internet-based exam and has instructor-led advanced workshops which you can find at www.reliabilityleadership.com . Recommended Study Material The Uptime® Elements™ Passport Series or full CRL Body of Knowledge is the recommended study material along with the Uptime® Elements™... [ more ]
Registered Member Which edition for CMRP training is currently available. [ more ]
Registered Member ❤️
See all 9 replies...
Welcome to AMPForum help
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 ]
See all 12 replies...
Welcome to AMPBook and Article Discussions
Vendor's Tech Notes, etc.
Registered Member PRÜFTECHNIK [url]Shaft Alignment and Vibration Guide[/url] - found this link broken - now you need to fill the form to get access Practical Guide to Shaft Alignment Technical notes: Registration is needed [ more ]
Registered Member CSI Technologies Knowledge Base Articles: Registration is needed There are also white papers here: Choose brand and document category [ more ]
Registered Member Brüel & Kjær Technical Reviews Accel Handbook (Russian) [ more ]
See all 5 replies...
Welcome to AMPEpic Failures Photo Album
Bearing failure at 36,000 RPM
Registered Member ❤️
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 ]
See all 5 replies...
Welcome to AMPCertified Reliability Leader (CRL) Forum
Integrity Conversations
Registered Member 👍
Registered Member Before casting blame, I would carryout an investigation as to whether the equipment is faulty or if the procedure, we believe to be correct, is actually incorrect. I would even review whether the replacement part is the correct one. [ more ]
Registered Member Not knowing more about the specifics, I would also look at the piece of equipment in question to make sure it isn't overworked/under-engineered. Don't be looking to assign blame. Find out exactly why it failed, then figure out how to prevent that from happening again. If it IS the fault of the crew, make sure they all know exactly how to do the repair. Different people interpret things.....differently. Make sure everyone is on the same page. [ more ]
See all 3 replies...
Welcome to AMPEpic Failures Photo Album
fault housing and bearing
Registered Member Can you post vibration spectrum? Thanks [ more ]
Registered Member Hi Husky, Just to share some knowledge abt tool that u use, SKF CMAS100. Default setting for Enveloping (CL2) reading is for shaft diameter OD 50-300mm & machine speed 500-1800rpm. In that your case is machine speed of 3600rpm, this vibr pen is not suitable. As for my experience, I am not using vibr pen for Enveloping measurement because it will not give either precise nor accurate reading. For vibration (velocity mm/s) is ok. Try ADASH vibr pen for more enhanced features. [ more ]
Registered Member I know what the tool is and that gE level would be high enough to warrant an inspection, were you able to grease the bearing mid reading? Ideally that tool is ok for assisting in greasing and less critical plant assessment, I wouldn't use it for high criticality machines your better off with a SKF Microlog in that case. [ more ]
See all 6 replies...
Welcome to AMPBook and Article Discussions
Machinery Malfunction Diagnosis and Correction seminar
Registered Member This 4-day seminar will again be offered starting on 22 July 2013 and running through 25 July 2013. It will be held at the Hilton Garden Inn on Padre Island Drive in Corpus Christi Texas. The area is a popular vacation spot and while you attend the seminar during the day the family can enjoy Padre Island and Mustang Island. The seminar uses the book Machinery Malfunction Diagnosis and Correction as a foundation document, and includes many additional topics to stay up to date with this... [ more ]
Registered Member John, if consideration to have a session in Malaysia will be materialized, i will wait for that one. [ more ]
Registered Member Valve, you still have time to sign up for the course and get a copy on CD and 4-1/2 days of facetime with Bob Eisenmann all for about the same price. [ more ]
See all 23 replies...
Welcome to AMPEpic Failures Photo Album
Paddle Fan Failure due to Resonance
Registered Member Rusty, I am curious whether or not there was any indication of a resonance, obviously taking place in the impellor, in the vibration data assuming that the seismic readings were taken on the bearings? How do you know that namely Blades Pass Requency had excited the resonance of the blades? In my opinion, the ringing/flexing of the impellor structure was transmitted to the bearings. Some "weired" frequency should have been seen. Of course no bump test made sense to do after the failure. [ more ]
Registered Member If welding is the problem, is it possible to check on the WPS, PQR and WQT records? [ more ]
Registered Member It's a good case, thanks for sharing. Since this question of how blade pass frequency affects the rotor was brought up in another thread… http://maintenanceforums.com/e...20203373#63620203373 it makes for interesting discussion and I'll throw in my two cents fwiw here. I agree with Bill, it's not obvious that the blades will see blade pass frequency forces unless we're talking about torsional resonance involving all blades moving together (so that a force pulse on any blade contributes to... [ more ]
See all 11 replies...
Welcome to AMPBook and Article Discussions
Batch Sugar Centrifuge Vibration problem
Registered Member We can balance only in single plane because we don't have access to other side,Those side movement might happen due to assembly error. We have successfully balanced onsite in single plane . I suggested before to check, if any assembly error might happen. Because I did not get any looseness in spectrum but 1X. [ more ]
Registered Member I have seen shop balanced rotors (but I havenever worked on a sugar screen) that had to be trim balanced when installed in the actual, on-site driven position. I am still confused about the visible movement in your video of the one, I guess your are currently working on, that has so much side movement when the brake is applied. Is this a common thing in all of these type basket designs? Appears that the mounting and driver is loosely mounted. The video does not seem to show any side movement... [ more ]
Registered Member I have balanced before centrifuges and batch sugar baskets on site. But mostly they sent for shop balancing. [ more ]
See all 10 replies...
Welcome to AMPEpic Failures Photo Album
Bad Bearing- Well Balanced Fan
Registered Member I have added low vibration alarms to certain fan measurements for this exact reason. I have a number of overhung fans on dust collectors that tend to skid since I think they are loaded with "upseedasium"! Got caught by an inboard bearing that catastrophically disassembled and went very smooth. The bearings are in a dog house guard and could not be visually inspected. Won't be fooled again with the low side alarms in place. See illustration] [ more ]
Registered Member ❤️
Registered Member Perfect example for why vibration analysis alone will not catch every bearing failure!!! Sometimes you need eyeballs! [ more ]
See all 9 replies...
Welcome to AMPBook and Article Discussions
Vibration Analysis Techniques Guide
Registered Member Here is a partially filled out Bubble Chart showing the phase angle tickmark usage. [ more ]
Registered Member Here is an updated version with support for Dan Ambre's techniques. The tick marks are 10°. To use the tick marks, highlight the one closest to the phase angle. In the next post, I have provided a sample that is partially filled out. Note how easy it is to observe in phase and out of phase readings. [ more ]
Registered Member We've switched hands here from right to left. [ more ]
See all 9 replies...
Welcome to AMPForum help
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 ]
See all 6 replies...
Welcome to AMPBook and Article Discussions
Victor Wowk
Registered Member Jeremy, use the following contact information and email or call him. John from PA Machine Dynamics Inc. www.machinedyn.com 1021 Commercial Drive SE Rio Rancho, NM 87124 PO Box 66479 Albuquerque, NM 87193-6479 (505) 884-9005 Email victor@machinedyn.com [ more ]
Registered Member Wowk mentions another book in his "Machinery Vibration: Measurement and Analysis" titled "Machinery Vibration: Corrective Methods". I have not been able to find this book and a small search only returns the "Balancing" book. Does anyone have this book or know where to purchase this book? [ more ]
Registered Member Thanks, my copy did not have the radius multiplier either. Have corrected it. Now when I get to using this formula it won't throw me off balance.... rgds [ more ]
See all 4 replies...
Welcome to AMPForum help
Is silence an effective strategy?
Registered Member I am a member and often times I do not speak up, because I am aware of very experienced and knowledgable people on this board that can most likely answer a question better (or at least in a more professional manner) than myself. There are many very smart people that hang out in here. Just an opinion. [ more ]
Registered Member Patrick - that would make a great T Shirt! Jersey have affected your mind for sure. Terry O [ more ]
Registered Member I was wondering how would those guys who said avoiding being "sucked in" do their information seeking or even information sharing if they are are good at something? In one oil major, information seeking or intelligence gathering is one of 10 to 18 soft skills which executives at various levels should possess and practice. [ more ]
See all 32 replies...
Welcome to AMPEpic Failures Photo Album
Predictive Maintenance Hall of Fame
Registered Member ❤️
Registered Member What do you think the Starrett Model 192 is worth as an antique? I had one show up at our plant that our machinest found in the back of a cabinet. It was a GE model. Probably will be a show piece for plant engineering. [ more ]
Registered Member I have one of these that belonged to my dad. I do not have the instructions for it though. Could you copy them and send them to me? moneal5396@d-m-motortech.com It sets on my desk as a reminder of how far we have come in this field. [ more ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
Frequency estimation on Mobius bearing fault simulation
Registered Member I like the SKF calculator. Excellent tool. [ more ]
Registered Member Interesting online calculator indeed. Also, interesting question. I guess your question is about observing a change in the calculated frequencies on the lower left part of the calculator when you tick or untick the box for Estimate frequencies. I've played with the calculator to reproduce what you saw. Ticking or unticking the box actually changes the values and my explanation for this is below. The way the calculator was programmed is based on two cases which are taught in the vibration... [ more ]
See all 2 replies...
Welcome to AMPEpic Failures Photo Album
Xtrem Bearing Damage
Registered Member Nobody ask this so i will, HOW LONG THE BEARING RAN AND HOW LONG SYMPTOMS WERE OBSERVED BEFORE IT FINALLY FAILED? OR DID YOU STOPPED IT? [ more ]
Registered Member dear rttech... What do you mean by "loss of interference fit" How can an established interference fit get "lost"? I think unless we have an image of shaft at it's bearing area, we can not conclude on the reason of failure. [ more ]
Registered Member interesting that you are using fan to keep it cools. how long did you managed to keep it that way?feel free to share with us last data of the bearing. =) [ more ]
See all 11 replies...
Welcome to AMPForum help
Copyright and Patent Infringement Issues on Forums and Databases
Registered Member Josh When used as part of a research study, government project, etc. some level of use is allowed (referred to as 'fair use'). However, I have already had one company put together a document, with my name throughout, that basically made up my registered copyright first edition of Electrical Motor Diagnostics (a $150 book) and then distributed it for free electronically. The response they gave was that they were 'promoting me.' Under copyright law, I have the ability to go back, as it is a... [ more ]
Registered Member If others use the information beneficailly e.g. in literature survey as references, this will promote their works which can bring income if there are required for talks, training or employment. I guess not many will blindly use internet information without screeening or approval first. [ more ]
Registered Member Indeed too much protection can hinder expansion of human knowledge, but on the other side, not protecting the creators will stop expansion also. You are being paid for your work, they also have to be paid. Not everything is free (except the air you inhale), if we rely too much on "free internet" information which is not being screened by trained professionals we will have accidents, disasters because any moonlighter can play engineer or doctor with free "online" knowledge. At least in this... [ more ]
See all 8 replies...
Welcome to AMPBook and Article Discussions
Maintenance and Reliability Books
Registered Member Asset management focusing on developing maintenance strategies and improving performance, edited by Alan Wilson, follows on from the original Asset Management book published in 1999. http://www.maintenanceonline.org/article.asp?id=6987 [ more ]
Registered Member I have been following Vee and Terry since long. Not only in this website but as well as in AMP. I would have to mention the work of Ricky Smith and Joel Leonard in the field of Maintenance & Reliability. Request Vee and other Authors to ensure that 'Indian' editions are released too so that it becomes viable for us to grab or order that copy which the whole world is going ga-ga over. Vee can appreciate this better. I am now preparing for CMRP and have somehow managed to read RCM II,... [ more ]
Registered Member Danged interesting idea.....there are so few references on the subject, and I don't know of any great flow of new information, and many of the good ones are either out of print, or will be soon....... I would be willing to put my two cents in.....some prime candidates (IMHO) are: Any of Jim Taylor's stuff - I don't think it is print any more, but there is (I think) a signficant inventory of his books stockpiled and available Art Crawford's wonderful Vol I and Vol II, which may still be... [ more ]
See all 11 replies...
Welcome to AMPForum help
New PdM Beginners Message Board
Registered Member I second Joe's recommendation. Two reasons: 1 - There already seem to be a number of the regulars who regularly responding to questions down on the PdM beginners forum. (not me). 2 - Quite often the "beginners" question is not simple at all. [ more ]
Registered Member Terry, How about limiting the "Posters" to beginners only but allowing more experienced people to way in with answers? By knowing that the person asking the questions is new to the field, we could be sure to present our replies with more detail and understanding. [ more ]
Registered Member Hi everybody. I consider myself a "newie" in PDM, but nevertheless I don't feel left out, I think that occasionally my questions are not clear enough because "experience issues", but that is something to cope with in time. I value this forum as a knowledge community, it's selfless sprit and all the people that post reply to questions that are made. Sometimes (most of them luckily ) the answers people give are helpful, other times, not so much. I agree a bit with danny, in order that a... [ more ]
See all 13 replies...
Welcome to AMPEpic Failures Photo Album
Noisemakr's Infrared Images
Registered Member New images added today, 3-25-2011. Images are of a fused disconnect feeding a capacitor on a transmission line feeding our plant. Although the temperature is not high, the difference in like components is significant. It would appear the “fuse/disconnect clip is either loose or corroded. [ more ]
Registered Member New images today. 10-5-09 Boiler external wall audit. These are some good examples of insulation failure in our boiler walls. [ more ]
Registered Member New images added today 7-27-09. The new images are of a 400 HP Open Drip Proof motor. As many as 12 restart attempts were made in less than an hour not confirming one phase conductor was shorted inside the motor's junction box. The motor lead was found to be melted apart. Root cause was chafing of the insulator and subsequant short to ground. This image was taken after all termininations were redone. As can be seen, one motor lead shows significant heating. Add to the heating issue, a 40 AMP... [ more ]
See all 7 replies...
Welcome to AMPEpic Failures Photo Album
Gear oil failures in windmills
Registered Member Yeah they try to find new oil instead of doing complete RCA. I am sure all thier engineering is sound on paper, But if reality does not match expectations of engineering it means back to the drawing board. I would think Their brake system should be providing the static load bearing force when stopped or rotational speed gets slow to point of bearing failure. I know armchair quarterback rite? Well engineering only realizes and legitimizes facts and variables known and/or previously... [ more ]
Registered Member One has to consider the definition of "lifetime." Major overhauls are currently being needed every 3-4 years, so how do we define the word. John from PA [ more ]
Registered Member I remember when BMW tried calling their motorcycle final drive gear oil a lifetime fluid. They committed themselves and removed the drain plug from the rear end casting. Final drives were failing very often as a result. Toyota called out that their transmission fluid should be considered "lifetime fluid" unless used under severe conditions. But they gave the usual drain plugs and dipstick "accessories". I wish them the best of luck in developing a lifetime oil for a severe duty bearing. [ more ]
See all 8 replies...
Welcome to AMPForum help
attachment problems
Registered Member Thanks Pete I will agree - with 12,000 members and tons of posts and attachments - and from what I can tell - this is the most trafficked maintenance focused site on the internet - these forums are pretty robust. Wish everything else in the world worked as well. Terry O [ more ]
Registered Member This forum runs so smooth we tend to take it for granted. Thanks Terry. [ more ]
Registered Member We host all our sites at www.pyramid.net . They are maintaining Front Page support - may give you a buffer until you switch to new web editor program... [ more ]
See all 6 replies...
Welcome to AMPForum help
Forum Wish List - speak now or hold your peace
Registered Member Thanks john and Terrence. [ more ]
Registered Member Originally Posted by Reliability: Advanced search is available Click search (upper left) Click Adanced search link (upper right) from Search page Thanks, not used to clicking "Search" initially to yield a secondary level of searching. [ more ]
Registered Member Advanced search is available Click search (upper left) Click Adanced search link (upper right) from Search page [ more ]
See all 34 replies...
Welcome to AMPForum help
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 ]
See all 13 replies...
Welcome to AMPForum help
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 ]
See all 7 replies...
Welcome to AMPForum help
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 ]
See 1 reply...
Welcome to AMPCertified Reliability Leader (CRL) Forum
Our CRL goal is ...
Registered Member Mohammed, I'm not sure if I understood your comment correctly. If you want to get certified, you need to take a computer based exam from the announced events on this website. Terry has been traveling a lot and putting a large investment in promoting this certification. Regards- Ali M. Al-Shurafa [ more ]
Registered Member Please reply with first step for the certification. Regards, Mohammed [ more ]
See all 2 replies...
Welcome to AMPForum help
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 ]
See all 2 replies...
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 ]
See 1 reply...
Welcome to AMPEpic Failures Photo Album
Perfect PM Compliance
Registered Member 😂
Registered Member ❤️
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 ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
100 Years in Maintenance & Reliability by V. Narayan, JW Wardhaugh and MC Das
Registered Member I have read Vees book and its recommended reading for the students on Robert Gordon Unversity's MSc in Asset Integrity and Management. As Terry as highlighted its one of the few easy reading books where you can pick it and read a chapter that delivers a case study. One I liked was how pump reliability went from 10 months to 40+ months and the tactics that were used. There is also another interesting chapter on achieving a reliability culture among the workforce. [ more ]
Registered Member Vinay, Any news on your market research? I am in in India (Pune) now, so if you are coming over during the holidays, let me know. [ more ]
Registered Member Vinay, Either system will do; thank you for the effort. I will be in Pune, india in the Dec/Jan period. Are you likely to be there in that period? [ more ]
See all 13 replies...
Welcome to AMPForum help
A separate posting board for RCM
Registered Member I guess what you mean is to enable easy searching and browsing for RCM-related posts later on.... [ more ]
Registered Member I would definitely be in support of a separate forum for RCM. There were many templates developed within my area, prior to my time, and I would like to have the opportunity to review similar ones when we review ours to confirm we have covered all angles, and thought of as many angles for failure. [ more ]
Registered Member The right wording is a separate forum for RCM. [ more ]
See all 3 replies...
Welcome to AMPForum help
TEST: Adding attachment from IE11 browser
Registered Member From tech support There is a known issue with IE8 attachments. There are no known issues with IE9, 10, or 11 with attachments/uploads. (You were talking about a user who was using IE11 earlier.) We actually plan to increase the minimum browser requirements for Hoop.la for IE users to IE9 very soon, however (within a week or so), so I would recommend telling that user to upgrade their version or IE (or use an alternate browser, like Chrome, Safari, or Firefox. IE8 was released in March 2009,... [ more ]
Registered Member Test of an attachment using IE11, compatibility off. Successful. [ more ]
Registered Member I have the problem too with IE8. Compatibility view - no difference, Protected mode - no difference, trusted sites - no difference. Google Chrome - ok [ more ]
See all 10 replies...
Welcome to AMPForum help
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 ]
See all 7 replies...
Welcome to AMPCertified Reliability Leader (CRL) Forum
Leading Into the Skills Gap
Registered Member Required [ more ]
Registered Member Hanging up the stigma behind Trades as a career is important to the sustainability of domestic manufacturing and keeping local economies strong. The Perkins Act focuses on areas where improvements can be made to current law in three key ways. First, it supports initiatives that promote careers in the Trades. Secondly, it facilitates collaboration among Trades educators and employers on appropriate training curriculum. Lastly, it ensures that training for highly skilled positions better... [ more ]
Registered Member ❤️
See all 2 replies...
Welcome to AMPForum help
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 ]
See all 2 replies...
Welcome to AMPForum help
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 ]
See all 7 replies...
Welcome to AMPForum help
Guests are invited to join
Registered Member Terry, Do you mean you are the reason I am paying full price on my Coach Bags? How am I supposed to carry my data collector? :-) Thanks for the efforts. [ more ]
Registered Member Hi, Yes I have and I know, it is a pain with all abuse. Hope conversion will work. Olov [ more ]
Registered Member Thank you Oli - 1) Backup is being done 2) Hoping move within 30 days 3) I think there was a problem with my email - I just got a new batch of member approval requests this AM an approved. 4) FYI: We get about 25% membership requests from "back linkers" who want to flood the discussions with links to their site for better search results. Coach bag discounts etc... This is why we screen - to keep the boards clean proactively. Please let your friend know we are sorry for the delay T [ more ]
See all 6 replies...
Welcome to AMPBook and Article Discussions
Beware of Technology Slavery?
Registered Member Quote: I have long been concerned with the dangers invoked by Kaczynski, so I hope there will be journalists with the guts and independence to review this book -- it provides a perfect framework for analyzing the uncontained Gulf disaster and subsequent reform efforts, attempts to regulate the financial/market system, political paralysis on global warming and nuclear proliferation, panics about obesity and mental illness epidemics, and it is highly relevant to a recent sudden burst of `who... [ more ]
See 1 reply...
Welcome to AMPForum help
Maintenance Forums community stats
Registered Member Hi Terrence, I think this information is interesting to review, but it occurs to me that it'd work better if one could see it in the personal area. That way you wouldn't have to post it every month . I take the opportunity to state another idea. Have you considered a spellcheck option for the "Post A Reply" window?. English is not my mother thong, but I try my best to write properly (my english is a bit rusted and i have to check the dictionary a lot), but there a are a lot non-speaking... [ more ]
Registered Member That is some interesting discussion. Do individual member stats motivate participation? Do they demotivate some ? Do they change the character of the participation? Beats me. Over on eng-tips.com, they have an elaborate system to track the activity of individuals. You can see the last login date. You can see the number of threads started, the number of posts, and you can break these down by the individual forum in which they appeared. Additionally, any member is free to anonymously vote a... [ more ]
Registered Member My earlier post sounded kind of immodest. I get at least as much help here as I give out and probably quite a bit more. Another reason not to keep score-fear of embarrassing those of us who aren't scared to ask for help on the many occasions that we don't know what we are doing. [ more ]
See all 9 replies...
Welcome to AMPForum help
Remodeling Forums
Registered Member The move is complete! [ more ]
Registered Member Good news! Many thanks. Regards-Ali M. Al-Shurafa [ more ]
Registered Member Dear AMP/MaintenanceForums.com Members, On Monday, August 17th, MaintenanceForum.com is pleased to announce enhancements to our website and move to a new domain at maintenance.org. The site is generating over 1 million page views per month and is one of the deepest knowledge sharing communities for maintenance reliability and asset management on the web. AMP includes 45,000 + members from over 40 countries. AMP also includes ~500 Certified Reliability Leaders from around the world. AMP or... [ more ]
See all 7 replies...
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 ]
Registered Member ❤️
See all 5 replies...
Welcome to AMPBook and Article Discussions
Best maintenance books
Registered Member Alright ! Thank you very much. I've found a way to estimate some KPI! How can I close this post ? [ more ]
Registered Member Actually, i am also looking books that what are you looking for. D. Polmer as a good writer, but i can not find any MTBS, MTBF, and how to calculate it. Otherwise, some maintenance books did not mention and discussed it in their book [ more ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
Suggest Book
Registered Member Thanks John [ more ]
Registered Member Review the thread at http://maintenanceforums.com/e...089011/m/71620966173 . Note that the last entry (as of this moment) mentions a book by James Taylor. This may be the book (http://www.amazon.co.uk/Vibration-Analysis-Handbook-James-Taylor/dp/0964051702) although I can't be certain of the book Bill Kilbey is referring to. [ more ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
Digital Signal Processing Book
Registered Member Because of the subject line, I can't pass up mentioning that there is a very good DSP book available for free on-line, roughly equivalent to an engineering undergraduate DSP textbook: http://www.dspguide.com/pdfbook.htm (click on each chapter on left-hand side, and then download pdf link near left hand side) BUT, I should warn you: it is geared toward people that plan to do DSP programming and development, rather than people who want to know about the specific DSP techniques used in... [ more ]
Registered Member Dear John I have downloaded the file. It is really a good helping one. I want to go more in depth. Being a condition monitoring engineer, How much knowledge of Signal processing is sufficient??? Thanks in advance for your kind advice. Zaheer CM Engineer [ more ]
Registered Member Did you download the HP Agilent publication I sent you before? John from PA http://maintenanceforums.com/e...20675763#59720675763 [ more ]
See all 3 replies...
Welcome to AMPBook and Article Discussions
critical speed
Registered Member critical speed is the speed when the natural frequency is excited by the mass residual unbalance force. at this state the mass factor and the stiffness factor are against each other in direction which cause to lower the system resistance to vibration force. any type of rotor will have one or more critical speed. so it will be like 1st critical speed 2nd critical speed and so on. [ more ]
Registered Member Dear The reason is that when an equipment is operated at critical speed resonance occurs shooting vibration amplitude. Which can lead to failure. Zaheer [ more ]
Registered Member Critical speed is the speed at which equipment has highest vibration amplitude. Critical speeds are not different types. A pump should not be operated at its critical speed. Example: If you have a pump that starts from 0 RPM and 890 RPM is its maximum speed. If pump critical speed is 800 CPM then design changes are required. This is some basics for your understanding. [ more ]
See all 3 replies...
Welcome to AMPBook and Article Discussions
Natural Frequencies in FFT Spectrum
Registered Member Zaheer, I think impulse test can be used to find the natural frequency of the gear. Practically, high backlash, tooth wear, damaged tooth or any other reason that can produce high bandwidth vibration,may excite gear natural frequency. Irshad [ more ]
Registered Member You will need to talk to the engineering dept of the gearbox OEM (original equipment manufacturer) or perform natural frequency tests of the gears with vibration analysis. In the FFT/spectrum you will be looking for peaks that have a wide "skirt" at the base of the peak. High resolution data is necessary to verify and an fmax equal to 3.25 times the gearmesh. The peak/s with skirted base may or may not have a high amplitude but most likely a higher amplitude. Keep in mind that if you suspect... [ more ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
Comprssor Surge and Stall
Registered Member Sorry no I had a close version of that a few years back covering mostly the same information. It was directed more to the automotive and heavy truck industry. They are one and the same as each other. I would like to read the portion on mathmatical flowfield projections. I have been trimming turbo impellers for my car and without true numbers it is slightly hit or miss. Not a fun task when it involve dissassembly of turbo ,exhaust, and intake air each time my guess is off. [ more ]
Registered Member Any one familiar with this book ? [ more ]
See all 2 replies...
Welcome to AMPBook and Article Discussions
Building a Reference Library
Registered Member I am going to be greedy and exceed three so here goes: Out of Crisis by W. Edwards Deming because it includes ethical and moral business leadership combined with human respect and robust processes. Read New Economics immediately after. RCM: Gateway to World Class Maintenance by Anthony M. Smith and Glenn R. Hinchcliffe (or you could read RCM II by John Moubray) because you will have a better understanding of how to create a maintenance program that preserves system function. Benchmarking... [ 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

Upcoming Events

VIRTUAL CRL EXAM
VIRTUAL CMM EXAM
VIRTUAL CRL EXAM
VIRTUAL CMM EXAM
VIRTUAL CMM EXAM
VIRTUAL CRL EXAM
VIRTUAL CMM EXAM
VIRTUAL CRL EXAM
VIRTUAL CMM EXAM
VIRTUAL CRL EXAM

Complete Calendar

Online Now

×
×
×
×
Link copied to your clipboard.
×