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Asset Condition ManagementPosts About Ultrasound Testing
Ultrasound vs. Vibration Analysis
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Registered Member Which failure modes can US detect but Vibration cannot effectively detect? Which failure modes can Vibration detect but US cannot effectively detect? Regards- Ali M. Al-Shurafa [ more ]
Registered Member Greetings Zach from BAMA , Ultrasound is a value added tool when we use with Vibration and Infrared Thermography but not an alternative to them . We can find bearing faults / Lubrication issues with it but can not find the root cause with it .For example Bearing damage due to misalignment .Integrated approach is the best strategy . [ more ]
Registered Member Maybe (just a suggestion), you need to revisit ultrasound through training to see how others in reliability use this technology as a complimentary tool? Best Regards, Jim Hall, CRL, Mister Ultrasound, The Ultrasound Institute.(next TUI Level I Jacksonville FL October 2021 [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
ISO CAT CERTIFICATION FOR ULTRASOUND
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Registered Member ULTRASOUND TRAINING AND CERTIFICATION ISO CAT I. SDT Ultrasound is a world-renowned provider of ultrasound training and certification. In accordance with ISO 18436-3 and 18436-8, SDT's ISO CAT I Certification Training is a 4-day course with an essential mix of theoretical knowledge and practical experience. iso certification delhi [ more ]
Registered Member http://theultrasoundinstitute.com/ [ more ]
Registered Member thanks for all guys about the information. I has been worked with SDT 270 equipment so that ue is not the best choice for me. Does any training center locate in Australia or singapore/ thailand. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Bearing failure missed
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Registered Member Interesting, but tbh these look like high friction (lubrication). It might be interesting to share your database with some of our experts. We could do that by private message though better. [ more ]
Registered Member Thanks Allan The bearings are 6309 Asset are pumps, motors are 11 kW RPM are usually around 1200-1300 Closed bearings, not possible to lubricate Screenshot from UA2 is NDE bearing from motor, just loud bearing, very similar to many other bearings. Almost all bearings have dbuV around 55-75 I attached two screenshoots from the software, maybe not useful. it is almost 60 motors I am monitoring monthly for this factory. [ more ]
Registered Member Hey there Gisli, Sorry for such a late reply to your post. These trend graphs are coming from your UAS2 software from SDT. I've looked at each and I am not that concerned by the CF levels. However the RMS in each case heard significant rise while the CF stayed same or moved lower. This is 100% an indication of FRICTION without added impacting. Your SDT equipment delivers four condition indicators: RMS - Friction. maxRMS - Friction and signal stability. PEAK - Presence of impacts, rubbing,... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Ultrasound for rotating lossenes in electical Motor
RM Registered Member
Registered Member Dear Sir , VA can gives you clear picture of Rotating looseness and Ultrasound can tells you rubbing signature due to looseness . [ more ]
Registered Member Depends, It will detect friction, if the component is impacting sufficiently it will show up. But Vibration analysis might be a bit more beneficial in this instance. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
2 faults same motor?
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Registered Member Tom, why don’t we just wait until we see the vibration signatures. [ more ]
Registered Member Bearings are same on each end of this motor. Vibe analysis will be performed at the end of this month. The inspections I do are with ultrasound and infrared only. To get the bearing faults to align with the correct Hz in the software, the motor would have to running at TWO different RPM's. THUS my question. [ more ]
Registered Member Is it possible there are two different bearings in this motor? Causing two separate fault frequencies? I agree, where are the vibration spectra? [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Helium Leak Detection
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Registered Member Depends on the pressure, type of leak (tear, crack, piping, distance) at the leak site. Typically, ultrasound is rated at finding a leak at 1x10-3 to 1x10-4 std/cc/sec.(ASNT E-1002-96). Of course helium & specific gas detectors and mass spectrometers such as those typically used for helium as well detectors that read difference in thermoconductivity, are more sensitive than the UT. At one time, UE Systems sold a liquid known as LLA or Liquid Leak Amplifier. This was a low surface tension... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
11KV power cables in a paper mill about 5 cables from power station to plant observed ultra sound
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Registered Member Greetings Mr. Dave Pleased to note your analysis report. Thanks for all your sincere efforts. The plant is going to shut down in another 2 months and we will once again proceed to verify the power cables. kind regards chary [ more ]
Registered Member Chary, sorry it took so long to get back to you. When I playback the wav files there is a common frequency present in the files. Shown below are the fft and waveform of 3 of the wave files Wav3 shown above, 4000hz with harmonics of 8 12 16. Wav1 shown above, same 4000hz with harmonics Wav2 shown above, same 4000hz with harmonics This could be a VFD firing frequency back feeding noise through cables to transformer. Not sure what else could generate this high of frequency in your cables. Any... [ more ]
Registered Member Chary, Did you resolve the case of the unusual HV cable noise yet? Walt [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
basic of ultrasound testing device
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Registered Member The book listed above is excellent. For a bit lighter reading you might take a look at http://cstsolutionsllc.com/wp-...versaltechnology.pdf . There are also a few other articles in the same section you might find interesting. Personally I think the best thing you can do is take a level 1 course-well worth the time and money Steve Oberstein steve@cstsolutionsllc.com [ more ]
Registered Member thanks in advance [ more ]
Registered Member Glad to help you out here, Aziz. The first published book about your topic, Hear More, A Guide to Using Ultrasound for Leak Detection and Condition Monitoring, by Allan Rienstra and Thomas Murphy, was written, to fulfill exactly, your needs. Hear More is avaiable for purchase from The AMP Bookstore. If you are coming to IMC-2017 in just one week’s time you can purchase the book there. Are there any specific questions we can answer for you in the meantime? [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Analysing Ultrasound
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Registered Member Gisli - Yes, I'm sorry to learn about that. I checked with the two techs that were designated to review the data and both were on extensive transcontinental travel. Can you send me the link once again please? I will download it immediately and distribute it personally. [ more ]
Registered Member I sended the file by www.wetransfer.com for more than one week to all e-mails. No download has been made. [ more ]
Registered Member Thanks. I will send it after weekend. Travelling at the moment. Thanks again Gisli [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Change in UvDB when Settings in Frequency converter are changed.
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Registered Member Hello Gisli, thank you for sharing this important data with the community. Varying the switching frequency can have a significant impact on the vibration and ultrasound data from your motor. There are three thoughts which I would like to share with you initially: 1. What is the energising signal looking like? 2. What is the switching frequency doing? 3. What is happening with the bearings? The energised signal can best be described as a chopped up DC signal. It is a series of pulses, square... [ more ]
Registered Member Thanks Paul : ) Soo....these changes are not necessarily because of friction (which produces ultrasounds ) due to the frequency converter. They are known to reduce bearing life..... I am still confused but understand ( almost what you are saying. What's confuses me is the fact sdt only listens to ultrasounds due to friction ( but those sounds which can be heard from frequency converter in sdt are not from friction or turbulence or what ? &nbsp Am I totally lost or should i just ignore... [ more ]
Registered Member Gisli, I am sure that there is a much more technical response then what I have to offer, and I will leave that to someone else, but I will give you my non-technical reason for the change in dBuV when changing frequency. I hope this helps. I will start by saying that SDT does have the capability of using a variable frequency mixer from 1 kHz to 128 kHz on every 270, and that there are some limited applications that I do recommend changing the frequency for, but for most applications including... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
CTRL Systems is Reliable?
RM Registered Member
Registered Member Hi Vib Ecuador, We have many SDT ultrasound analyzers sold in Ecuador without any complaint of our customers. We can visit your or if you prefer, you can visit us in Guayaquil. Our email es mario.urquizo@vibratec.net . I expect to hear news from you soon! [ more ]
Registered Member Dear Vib Ecuador Please see my reply above to ConfMX. It applies to you too. I invite you to contact Mario Urquizo ( murquizo@vibratec.net ) in Ecuador for advice about ultrasound. But, if you want to answer my questions (see above post), you can do it directly here in the forum or you can send to my email: allan@sdthearmore.com You can also email gus@sdthearmore.com Everyone I recommend will not give you advice about which instrument to pursue until they fully understand the answers to... [ more ]
Registered Member Dear ConfMx, I am going to suppose your profile name indicates you are involved with reliability in Mexico. I hope I am not wrong with that assumption. Regarding your question about CTRL, you have to do your homework and choose for yourself ultimately. I could help you with recommendations but first I need to understand what your organizational goals are. I mean answer one simple question, and then the other questions are easy. Here they are: "Why Ultrasound"? Then, "What do you hope to... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Worn - Idler, rollers on conveyor belt for mining operation
RM Registered Member
Registered Member Jim, I think finding wear spots on the rollers would be quite a challenge for ultrasound measurements, because of high background noise from bearings and belt on roller friction. I would consider using an active source to overcome the background noise. You will be a hero if you can actually do it successfully! Walt [ more ]
Registered Member Yes, I have tested several hundred rollers using both the Flxible wand airborne sensor and contact. However, mining conveyor system as in the salt mining industry, has problems with rust due to corrosion then deamination of metallic rollers. I realize there's alternative roller materials. But, the issue is inspecting and discovering early on. Thanks Jim [ more ]
Registered Member Jim, I've Not detected what you describe but I have picked up bad bearings on the rollers of conveyors like you describe from some 40-50 feet away in a quarry application using the acoustic horn on my device, and then confirmed it with the contact probe when up close, by comparing the noise to a neighbouring roller. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
New to Ultrasound (Ultraprobe 10000)
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Registered Member The waveform (lower plot) looks clipped (+ and - peaks are flat), so your range may be incorrect and causing an overload. There is nothing in the spectrum to be of interest! Walt [ more ]
Registered Member What type of bearing? How many balls/elements? RPM's? Where you using a magnetic mount or contact probe? VFD's? [ more ]
Registered Member Dave and Steve - Thanks for the replies! I'm registered on UE's site and have been working through the tutorials and sample sound files, but haven't found anything that matches up with my recordings. I attached a screenshot of the dual display (spectrum & waveform) on my original post. I was thinking bad bearing until I noticed this particular squarish looking waveform (and accompanying "rough" sound) across approximately 30 out of 40 motors I collected data on that day - all the same... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Breaker noise using airborne ultrasound
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Registered Member Dear Mr. Dsteve This is a Great Case. Well this is 480 panel and taken from outside of the cabinet is fine. Normally I follow these when a sound identified for 480V panels. 1. You can open the panel (if the interlock can open during running) or otherwise stop the machine open the cabinet and switch on breakers and start the machine. 2. After open the panel you can use the rubber focus pipe and scan the source of noise location and the component like MCB, Aux panel or Electronic card etc., 3. [ more ]
Registered Member Dasteve, If you can open the panel and have access to a Thermography Camera you may be able to confirm the fault.. Have a nice day and Happy New Year!! [ more ]
Registered Member Regardless of the sound 480 should not make any noise. Open the panel and view it visually to locate the problem. If you can open the panel while it is still online use the UE10000 with the rubber focusing cone and scan, "BEING EXTRA CAREFUL" not go past the permimeter of the door with the instrument. After listening to the sound it does sound like tracking and at 480v no corona is present. Only possibility is arcing and/or tracking. Whats missing for it to sound like tracking is the typical... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Underground Leaks
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Registered Member Did u find your leak and if you did how? [ more ]
Registered Member Thanks for the information. I have been curious about testing our underground firewater lines at the plant I'm based at with our ultrasonic equipment. We have had some failures this year and there have been questions about using ultrasonic equipment to test for leaks. It sounds like third party may be the way to go. [ more ]
Registered Member Ok let’s go through this a little before you spend a HECK of a lot of time finding this leak. I typically find this type of leak on a fire main in 1.5 hours or less. First of all, yes, I teach ultrasound and I am an SDT user but for this application you are wasting your time. First of all DO NOT USE 38.4 kHz "TOO" high. Utilize the 5hz-18khz range. Some SDT units have frequency adjusts…use 15.1 kHz if you use the SDT instrument. Other instruments that do not adjust that low, use 20kHz. You... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
PASSING VALVE INSPECTION IN OIL & GAS
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Registered Member I think much depends on the type of valves you are looking into. Some discussion of valve leakage can be found in https://www.maintenance.org/top...-of-hydraulic-valves In this thread, Walt discusses having success on hydraulic unloading valves. I performed some testing years ago on the performance of an acoustic valve leak detector. The theory (as it was then; perhaps some new methodologies now exist?) was to compare the vibration between upstream and/or downstream valve locations to a... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Anyone using Ultrasound on slow speed apron feeder bearings?
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Registered Member Hi Greg, It is to bad that this mine has closed. I have used vibration (CSI) on apron feeder bearings at a large hard rock mine with some success. I personally found that peakvue worked when using the autocorrelate function. This got rid of the other noises from rock hitting, rubbing, chain noise etc. At 1rpm I typically take 5-10revs of the shaft so this may take awhile collecting the data We ended up finding that the bearing was loose on the shaft in our case. [ more ]
Registered Member Hi Mark, Sorry I didn't get back to you on this but the mine closed in Dec/2015 so I have no new data. [ more ]
Registered Member HI Mark, I'm going to get take more readings this week on the same bearing locations and also on the other apron feeder to compare. I will post as soon as I have done so. Greg [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Acoustic emission and ultrasound structure bone?
RM Registered Member
Registered Member Hi Walt, Thanks so much for your feedback! [ more ]
Registered Member I have had good success with ultrasound (39-kHz) with portable meter (SDT-150) for bearings and many other machine components. I have only used AE for leak detection on valves. There are no standards for UT or AE measurements or sensors as compared to vibration sensors and audible sound microphones. Try it before you buy it, since there is a lot of sales pitch and possibly not much relevant performance for your application! Walt [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Steam Turbine Leak
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Registered Member Update: Vendor sealed both leak locations at full power prior to a scheduled shutdown. At unit restart both the east and west side joints were found to have minor leakage. Will continue to monitor and reseal as conditions dictate. Fall outage inspection and repairs are in the planning stage. [ more ]
Registered Member "The same thing that happens when you take your thumb off the end of a garden hose. The turbulence goes away because the flow is now less restricted. I am not suggesting this will happen in your case, I am merely preparing you for the possibility that the leak may get quieter and you will need to explain that too." I don't think this analogy is relevant, since steam is compressible and water is not. Once steam passing through an orifice reaches sonic velocity the flow rate is constant. As... [ more ]
Registered Member Update: Returned the unit to full power operation and the sound level increased to 96dB. We are going to get a vendor in to shoot the joint with sealant. Fortunately there is valves installed near this joint to do that. I'm reluctant to continue monitoring this beast as the steam leakage and resultant temperature makes it a little dicey to be in the close quarters of the leak even when sporting the proper PPE. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Ultrasound application for Hydraulic Systems
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Registered Member Great Mr. RGF Thanks for your feed back. 1. The hydraulic pumps(Aggregate pumps) are variable displacement type and Number of pistons not verified. 2. The hydraulic motor driving the gear box with rotary type and associated with standard slide control valve, pressure regulating valve, relief valve and CB valve. 3. The malfunction noise can be noticed during running with leaking CB valve. 4. In both cases, one in a ship crane 25MT capacity and another spring winch on a VLCC ship. 5. Your... [ more ]
Registered Member You didn't mention the type of pumps your monitoring but I use Ultrasound to monitor my OilGear pumps on a few of our combustion turbine hydraulic systems. They are piston pumps with 9 plungers and produce a distinctive sound at 9x in the axial direction. When they are beginning to wear the 9x grows rather rapidly vice the 1x turning speed so you know you need to pay close attention and schedule an overhaul. [ more ]
Registered Member Dear Mr. Jim & Mr.Scott Very good question and answer initiative on this subject. I am practicing ultra sound with UE 9000 ultra probe in marine vessels and at two instances very successful one is at cargo crane and other at a spring winch on an tanker vessel. In first case of crane, two slewing hydraulically operated motors, crane was suffering heavy jerking CCW at some angle and the jerking was not every time. At first suspected the slewing bearing and vibration pulse was satisfactory... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Corona o mechanical looseness?
RM Registered Member
Registered Member Greetings team Very nice lead on Corona issue. 1. Viba mentioned vibration, noise around switch gear. Thermal no significant. Ultra sound noise appearing like electrical not mechanical. 2. On board ships sailing time I was confused with some different noises not related to corona or tracking, at time sounds of diesel generator valves movement, mechanical looseness of ship's vibration and panel rattling etc., I get confused with such noises and tried to secure panels tight and those rattle... [ more ]
Registered Member Hello Viba, I think that the scalable data you have taken with your SDT270 is perfectly adequate as it is. The key factor in the analysis here is that the 50Hz repetition frequency is not a nice clean pulse - all of the ringing on is a strong indicator of looseness. If you look at the FFT of your time signal in your UAS software, you will see that there is a lot of activity in the spectrum. All of this is being generated by the ringing. You could argue that this is therefore secondary... [ more ]
Registered Member Here is a file from my Level I training manual, as you can see the corona at 60 cycle (as compared to 50 cycles) has high-peaks and then half-peaks in between the high-peaks. In FFT's it appears easier to read. While in Time Series a little harder to see, but it is there as well. Your file appears to be looseness. In the future look at the files in both FFT's and Time.... Good Luck... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
AIRBORNE ULTRASOUND INSPECTION OF WATER DAMAGED EQUIPMENT
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Registered Member Greetings Mr. Jim Pleased to see your message in this forum very late. I am working for marine vessels with UE 9000 instrument and many times found the noise from ship automation side more and less in 6.6KV. About tracking, arcing and Corona I did not experience much cases as the vessels I am inspecting about 5 years old. In my further inspections I will comeback to you with my sound files on electrical matters. regards Chary [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Can ultrasound be used to find water line leaks?
RM Registered Member
Registered Member Greetings Mr. Jim & Mr. Dave The answers and explanations are very useful for those practicing the pipe line leaks and underground leaks. Thanks for sharing your knowledge and experience. kind regards Chary [ more ]
Registered Member Ladies & Gentlemen... You know me as a contributing editor for UPTIME Reliability Magazine. I am also, Jim Hall, Presdient of Ultra-Sound Technologies (ultrasound level I & II) and President/Owner of All Leak Detection & Locate (undeground water leak service company). I have been a ditch-digger, plumber, roofer, welder, aviation mechanic, aviation engineering technician and a salesman. Like many of you I wear/worn many, many hats. I started out in life in the plumbing industry in... [ more ]
Registered Member UE works off turbulence, if there is a tear in the line then the turbulence will be small, if it were just a hole then pressure would be greater and easier to find. It is not the depth of the leak it is the shape/type of leak. In some cases you can increase the pressure which will help locate the leak. I have used compressed air instead of water in the line and this worked great! I have also used infrared to find leaks in water lines buried under 12" of concrete. Need as big of temperature... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Strange noise in wave file from Apron Feeder Head Pulley Bearing
RM Registered Member
Registered Member Hi Mark, As Dave says we need information about shaft RPM, some pictures, size of pulley and if its driven by a planetary gearbox or a hydraulic motor Vibration spectra is useful in this case it's normal that shaft rotates at 5 or 6 RPM and we need a long wave to find out the problem (it usually needs to be trended because some people prefer not to do this on very low speed shafts). I had a case study with a apron feeder pulley bearing that had a non regular grease film that caused noise... [ more ]
Registered Member It's been a month, did you figure anything out? [ more ]
Registered Member Strange noises. One thing I did notice in the recording of the 18112015 is, it started the noise, a "second time", but quickly quit, at the position of the "d" in the word "Head" , while the "first noise", on this same "point" , 18112015 , started at the "r" in the word "Feeder". I did not hear a "second" start of the noise in the point "19102015". If you listen closely to all "3" sounds at the very start of each one, the same beep appears to be present. This is strange also, to hear it... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Slow Speed Bearing Opinion
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Registered Member Hi Mark, The problem seemed to have correct itself. It may have been scraper related as the scraper has since been changed. The last ultrasound survey looks and sounded really good. The vibration demodulated spectrum has also looked better the last couple months. [ more ]
Registered Member Hi Greg, Any update to this problem, I'm interested to see what you found [ more ]
Registered Member Sorry If I am being a bit thick, but is this Ultrasound or vibration? It looks like a csi screen your displaying but I see the ultrasound guys chiming into the discussion? As for Rms or peak to peak, I found out the hard way yesterday that rms doens work well with enveloped acc(Its useles full stop) and peak to peak is the best route to take.( I am still learning I know ) [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Piping Condition Management
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Registered Member As stated NDT technology like UT, here is an article that explains the theory of this type of testing. http://www.olympus-ims.com/en/...on-thickness-gaging/ With insulated pipes you will need to install rubber plugs for thickness measurement locations or TML's http://www.inspectionplugstrategies.com/ PSM process safety managed chemicals require MIP mechincal intergrity programs which include visual and UT measurements @ 5 and 10 yr intervals as part of a MIP program. If you are already using... [ more ]
Registered Member LRUT( Long range Ultrasonic testing) can help in this case to my knowledge. Further an NDT expert can tell you. To my best info, its scanning ranges upto +/-40 meter from the probe wrapped up at even buried pipeline. Just only you have to dig there where you have to install probe. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Steam Leak Orifice Size
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Registered Member Charles, You're welcome! Glad to assist and lend knowledge where I can. I'm sure your client will want to tidy this up before it becomes more catastrophic than it already is. Remember our talks about the recip that you were monitoring a couple years ago? Any follow up news on that? Do you still maintain the monitoring program on that installation? Have there been any failures (averted or otherwise?) You still owe me a good conference presentation LOL [ more ]
Registered Member Jim, on what basis would we conclude that "the physics of how you get to measurement of loss would be similar" for an open-air compressed air leak and a steam leak blowing through a hole in the insulation? My feeling is that these calculations are not relevant compared to the huge loss of $$ from the steam leak and the potential safety hazard of a steam leak blowing continuously. I suspect that the next "planned outage" will be scheduled ahead of time to get this steam leak fixed! [ more ]
Registered Member In case the opening is something other than a hole...such as a tear or crack, the decibel reading would be different. When using the chart provided for compressed air leaks by the DOE (Pipe Pressure, Orifice Opening) the calculations to achieve a CFM is different depending upon the opening. A well rounded opening may yield (or blow) 33-35% more air than a tear, crack or anything other than well rounded opening. For instance when calculating air leaks: "Well rounded orifices, multiply the... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Ultrasonic Equipment Maker in Europe
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Registered Member I Know this is an old post...but these guys are in France and look interesting.http://www.leakshooter.fr/ [ more ]
Registered Member Ultrasound in Europe is SDT. Strictly speaking, Holroyd is Acoustic Emission rather than ultrasound. [ more ]
Registered Member Check out www.holroyd-instruments.com . I've been using their stuff for some years now & found it quite effective. Regards, Aditya [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
BEARING DAMAGE OR NOT ?
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Registered Member There are many failure mechanisms that don't generate friction. If there is no friction, there is no heat. The time signal you show is quite impulsive in nature and does not have a large frictional component to it. Best Regards, Tom Murphy [ more ]
Registered Member Hi mark, for your reference... the wavefile between DE and NDE bearing is quite different due to high impact in NDE, regards [ more ]
Registered Member Hi Dominich.vo Can you post a ultrasonic time waveform and show both the DE and NDE data in the same Y axes. How does the wavefile of the DE bearing sound compared to the NDE. The crest factor is probably high due to the couple of random high impacts in the waveform. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Opinion SDT270 for Bearing Monitoring
RM Registered Member
Registered Member Hello Greg, the general rule of thumb which has applied to vibration measurement for years is to take a time sample corresponding to 3-5 revolutions of the shaft. So at 30rpm, 6-10 seconds would be enough. If the process takes longer to cycle, then take more data. On the SDT270 you can record up to 80 seconds in one go. In answer to your second question, no, there isn't any averaging process taking place other than that associated with the calculation of an rms overall value. Best Regards,... [ more ]
Registered Member Mi MarkSI I'm just curious how many seconds you are setting your static measurements for? Are you keeping the same time period for the soundfiles for each location? Also, Is it correct to assume that a 20 second static measurement is averaging? [ more ]
Registered Member Hi Mark, I have a Monarch laser tach (with reflective tape) that I use. I do find in my vibration spectrum that the bearing defect frequency is always off a bit on these slow speed bearings. We were having great success with vibration analysis here as low as 17 rpm. But we are fortunate that we can always do a physical inspection if I think I see something in the the vibration data, we initiate a work order to inspect bearing. With the SDT equipment I am looking for further solid evidence... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Brand?
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Registered Member I'm also evaluating the devices available for ultrasonic testing. I'm only really interested in monitoring low speed bearing applications and all I can say is I've had good success with the SDT-270 and I can't say enough about the team at SDT they have been extraordinary helpful well beyond what I would have expected. [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
LEAK NATURAL GAS
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Registered Member thank you very much for your support. What I require is whether or EU SDT ultrasound evaluation systems can be used to detect natural gas leaks. have normal function of air leakage or pressure, but we want to know whether it is appropriate and feasible to detect leaks using this type of gas. [ more ]
Registered Member Perfect use for ultrasonics however, make sure the one you use is intrinsically safe or you may find your leak with a boom and a flame. [ more ]
Registered Member Do you need to quantify the amount of containment loss? [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Help Interpreting Ultrasound Data
RM Registered Member
Registered Member The spectrum of this waveform contains no frequency data. You might try moving your probe around the machine to get a better idea where this is coming from. The amplitude of the recorded wav file is very low. How is the sound level of this bearing compared to other similar points? [ more ]
Registered Member Hi Tom, The bearings are 22222K in SKF brand [ more ]
Registered Member Hi Tom, Thank you for responding. I will get the bearing part number and get back to you. I should also mention that the housing was fitted with an automatic lubricator so it is doubtful that the bearing requires lubrication, that's not to say that it is over or under lubricated though. Here is the sound file from the drive side is which is very similar but not as loud. The Head Pulley bearings are so much quieter [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
BEARING LUBRICATION BY SDT270
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Registered Member Hello Dominic, I would like to help you. This website does not make it easy to access the data that you have sent. Please send the wave files and these attached pictures to me at tom@reliabilityteam.com Alternatively, you can make a backup of your UAS database and I can look at your data that way. Tom Murphy [ more ]
Registered Member Enclosed is the dynamic data of second reading was taken in 2 weeks later. [ more ]
Registered Member this is the static reading in two times measurement [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Transformer Inspection Using SDT 170
RM Registered Member
Registered Member Mr. Reliability, No you can trend the db's but, keep in mind that distance from the target is important. Say you take a reading on a bushing from 25 feet away, the bushing is cleaned-up, and you or someone returns to check condition but from 10 feet away. They may get the same readings or close to the same, where at 25 feet they may not get any. In the past EPRI has always mentioned to me that any corona (other than that on distribution lines from dirt & dust for instance) needs to be... [ more ]
Registered Member Allan & Jim, Thank you both for the reply. I am honored to have two esteemed professionals address my concerns! Obligatory Brown nosing aside.... From your experience it sounds like Ultrasound is the first order of detection, then IR and Oil sampling for verification. Jim, based on your comment, am I to assume that dB level is irrelevant if corona, tracking or arcing is present there is a fault? So this is not something that would be trended like vibration. It's a fault or no fault... [ more ]
Registered Member As Allan points out the ultrasound has a place beside both oil analysis and IR for transformers. Sometimes, when scanning the side of a transformer the use of a strong magnetic sensor is best used. This should be a slow & deliberate application as you may deal with cycling. I use a method by visualizing a grid pattern on the transformer (when applicable) to triangulate the internal discharge, arcing or tracking. Knowing the internal make-up of the transformer will help you diagnose a... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Monitoring (Hagglunds) Hydraulic Piston Motor Drive
RM Registered Member
Registered Member Hi Allan, I am still in the process of going through the maintenance and operations manual for these drives. We have not seen a failure in the 8 years we have been using these drives. I was just searching for some useful info to see if anyone was monitoring this style of hyd. motor using ultrasound methods. We have just ordered a new SDT 270 Dynamic unit and I am looking for some applications to use it where our vibration analyzer is of no use. I have just read your Hear More book and have... [ more ]
Registered Member Good morning Greg, Are there specific elements of the Hagglunds drive you are want to monitor? I get that the output speed is <1RPM so the bearing there will need the maximum Data Acquisition possible with the SDT270 which is 80 seconds. This will hopefully be enough to give you data from one full shaft rotation. Choose your sensor placement and stick to it. IE., Load zone, 12 o'clock, other. Make sure the surface is clean of debris and dirt. Use a magnetic mount on the RS1 Threaded... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Check Cavitation
RM Registered Member
Registered Member Take sound readings at the bearings as well as the pump housing. If the sound is elevated on the pump housing, you might have cavitation. However, without an amplitude measurement, you don't know if the issue is severe enough to require corrective measures. Take similar readings on as many pumps as you can so that you can some understanding of the range of ultrasound levels. This should shed some light on the severity of any cavitation for this particular pump. [ more ]
Registered Member By the way, the sound wave will be attached . [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Could SDT270 monitor the sleeve bearing ?
RM Registered Member
Registered Member Please review attached white paper on monitoring Plain Bearings with ultrasound, specifically, larger machines as used in bio gas facilities and cement plants [ more ]
Registered Member OK, So you have 1-impact event per shaft revolution. Possible causes include: 1) Loose inner housing compression nut at top of bearing (assume Dodge type with nut) -- so check torque to specification 2) worn or damaged thrust collar -- higher ultrasound at thrust bearing (usually inboard)? 3) loose coupling guard or other attachment to bearing housing -- check by touch If vibration levels at 1xSS are high, then balance fan rotor. The meter does not tell you what the fault/cause is, so you... [ more ]
Registered Member By the way, the sound wave of this sleeve bearing like that : [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
SDT270 Deleting recordings?
RM Registered Member
Registered Member Allan, The Unit that I have is an SDT270DU Ver 1078-1002-378. Ultranalysis Suite Ver 1.1456.0.0-03 [ more ]
Registered Member Hi Xracer, which firmware or version of SDT270 do you have? SDT270DU? SDT270SU? Other? You can dump data using either Ultranalysis Suite Software or via DataDump (again, dependent on firmware platform you own). [ more ]
Registered Member I believe I figured it out. Just resent the tree back to the meter and the recording have been deleted... [ more ]
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Asset Condition ManagementPosts About Ultrasound Testing
Ultrasonics for Low Speed bearing Monitoring
RM Registered Member
Registered Member So which are the best models available on the market for low speed bearing monitoring [ more ]
Registered Member That's a great point Walt! [ more ]
Registered Member That's 2.5 to 9 minutes, so you might want to use a sensor with magnetic base. Not only is it uncomfortable to hold a hand-held senor that long, but slight movement will give false measurements. Walt [ more ]
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