Skip to main content

MaintenanceForums

Sorted by last update

Asset Condition ManagementPosts About vibration/alignment/balance
High vibration @ Boiler feed water pump
Registered Member Greetings. I would like to also ask if there is a phase marker with the 1x vibration. During the period after a load increase, where the flow is reasonably steady, is there a phase shift associated with the "slow" vibration increase? Are the DE and NDE bearing vibrations in-phase or out-of-phase (of in-between)? Lyle [ more ]
Registered Member the pump has balance line? in case it has is possible that you have recirculations problems with this element, normaly the problem cuases when you increasse the load [ more ]
Registered Member I would test for natural frequency with pump running at low and high load to see if the natural frequency changes due to change in pipe support stiffness. The impact-response vibration method with negative averaging could be used. Consider installing a temporary ultrasonic flow meter on discharge pipe exterior to confirm flowrate at different load operating points. You might find that Pump-C flow is below BEP point evan at higher load, assuming there is another pump operating with it. Walt [ more ]
See all 5 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Bearing or Eccentricity
Registered Member I have downloaded pdf attached file that named was PUMP 11 DE bearing [ more ]
Registered Member First and second are Demodulation spectrum DE bearing ( 500-16k ) Then Velocity DE bearing ( no harmonics ) Last is Acceleration spectrum NDE and DE [ more ]
Registered Member I saw your 1x was 24 hz.didnt it? But if that was your 1x harmonic you should see them on fft [ more ]
See all 7 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
fluidizing blower high horizontal vibration(what else can be done, running out of ideas?)
Registered Member I see in the FFTs 2x and 3.*X in the blower, no one else? I've seen this blowers and manual said the bolts over the antivibration pads should be loosen. Re tightening could change the shaft alignment, the discharge side gets very hot, and the alignment is different if the discharge is inboard or outboard. [ more ]
Registered Member hi, we know this "solution"! I think it depend af an incorrect distibution of damper or external force by pipe or unplane floor. we tried to put a thickness between dumper and chassis. [ more ]
Registered Member Good day every one. i just want to update that we already manage to reduce the high horizontal vibration of the blower by simply loosening the overtightened bolts of the newly installed vibration pads. may this case a reference for every one in the future. Thank you all for taking the time to respond, sharing of ideas and experience. @Registered Member @Registered Member @Registered Member @Registered Member @Registered Member @Registered Member @Registered Member [ more ]
See all 53 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Low Speed Bearing Analysis - What is possible?
Registered Member Thank-you Walt and Vic. Your learned and timely responses are very much appreciated. Tony [ more ]
Registered Member So, that's what this is. Well, if the downtime cost justifies the investment, then so be it. [ more ]
Registered Member "WWII oil flooded recip's once in China and the old earth quake (ball & pivot) mercury switches provided sufficient protection >99% reliability for 50+ years." Does this indicate the vibration switches detected every machine fault/failure, or there were no machine failures, or the switches never activated (including no earthquakes) in 50+ years? I am proactive with my wheelbarrow (garden carts) by keeping the bearings lubricated. The mining machine in the OP probably has a greater... [ more ]
See all 11 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
High Vibration in 1X in vertical seal oil pump
Registered Member So H is taken 90 degrees to piping and V is taken inline with discharge pipe? Is this a new installation or existing? How does the base plate anchor inside the housing? I see a square plate, is the pit/housing also square? Highly unlikely an outer race fault would create this level of vibration, acceleration values would be high if bearing was bad Any recent maintenance activities? Pipe strain, mounting plate not properly anchored, assembly errors What type of coupling? Is pump flow and... [ more ]
Registered Member Hi John, i got your point. let me show you our pump, as attached, this is emerged pump with oil filter in discharge. We have 3 pumps were installed with same design ( copy past ), but we don't have this issue. what do you think ? is it excessive clearance between outer race and housing ? Regards Anis [ more ]
Registered Member You totally missed my point! Vertical pumps are often stiffer in one direction due to the external piping, the discharge line for instance. A transducer is often mounted in-line with that piping and the other of course at 90 deg. I do not know what X or Y mean (horizontal or vertical) with respect to your pump. In the attached graphic note that the "Y" is in line with the piping. [ more ]
See all 5 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
I.D Fan strange Balancing response
Registered Member " I see by one of the provided spectrums the 1X (975 cpm) is about 2.45 mm/sec for the same measurement point. The overall is 6.072 mm/sec and there is a substantial amount of higher frequency above 5 kHz." That is why I questioned the value of balancing! Some of the OP numbers could be filtered 1xSS or overall levels. I will wait for the OP to clearify the balance numbers with 1xSS amplitude-phase and overall level for each measurement point and each configuration. Walt [ more ]
Registered Member Walt, I'm seeing numbers in the tabulated data that are in excess of the "...very low before balancing (highest was 4 mm/sec or 0.16 in/sec)" that you mention. In the initial run I'm seeing 7.93 mm/sec in the "FAN N.D.E HORIZONTAL". In addition, based on the provided data, that likely is mm/sec RMS. 7.93 mm/sec = 0.31 in/sec and if we bump that up it is 0.44 in/sec peak. The data seems very erratic as well. I see by one of the provided spectrums the 1X (975 cpm) is about 2.45 mm/sec for the... [ more ]
Registered Member Filtered vibrations levels at 1xSS were very low before balancing (highest was 4 mm/sec or 0.16 in/sec). The 1xSS was not the dominant frequency in velocity spectra, so it has minimal affect on the overall velocity levels. Why are you doing balancing? If you must do balancing, then why not do a single plane solution for only Plane 2 that had roughly 3x higher vibration level levels and similar phase to Plane 1? If amplitude and phase are changing a small amount, then averaging would help... [ more ]
See all 16 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Cement Plant Air Separator Bottom bearing Condition Monitoring
Registered Member if the lower support is fixed with tie rods (four crosses), on these you can measure the vibratory state and peakvue with CSI instruments. the values are always very muffled, you must note the tendency to increase (at the same speed). in my opinion, the best thing would be to check the fat output. the labyrinth grease is disposable but the bearing grease should be captured and taken out with a tube. these pipes (supply and drain) must be insulated otherwise the dry grease forms a plug [ more ]
Registered Member Because we all know what is a "sks separator".... this is an very old post [ more ]
Registered Member Cement plant professionals can achieve a predictive and proactive maintenance strategy with the help of real-time data from online condition monitoring systems. Cement plant condition monitoring can reduce the time-consuming field work, the plant can count on precise measurements, increasing the reliability of failure detection and consequently the availability of plant equipment. The following cement plant equipment can be monitored with condition monitoring: Monitored Equipment Vertical... [ more ]
See all 8 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Lobes Compressor (A headache!!!)
Registered Member Mr. CJ,You apear to be a sales person who has offered nothing of technical value to an old discussion! Walt [ more ]
Registered Member We offer blowers and pneumatic systems. You can see more info here: https://www.palamaticprocess.c.../pneumatic-conveying [ more ]
Registered Member HI Reliable Analyst, Can you share root cause of your compressor high vibration if it was solved ? Regards Imran [ more ]
See all 29 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
bearing failure analysis on a 900hp compressor motor deep groove bearings
Registered Member I was about to raise same thing Ralph related to obstruction of topic. It would be better to cut the cage and see the inner ring surface as well. IMO, It seems like abrasive wear due to inadequate lubricant and would be ended with spalling if allowed to run longer. Excessive axial load didn't allow lubricant to perform as it supposed to. Suggested lubrication frequency and quantity would be suitable for design load. However, Installation of asset, operations and behavior of the driven... [ more ]
Registered Member Looks like there was a tremendous axial load being applied, causing a heavy, 360 Degree contact with the outer race. Why are the pictures obstructed by the Topic definition? Thanks, Ralph [ more ]
Registered Member Thanks for the closeup pictures. Unfortunately they are not really sharp so hence difficult to see exactly what you describe in your text. You might want to review the document at Bearing damage and Failure Analysis [ more ]
See all 3 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
The sawtooth vibration behavior occurs after steam turbine running up to normal speed
Registered Member I have attached Exhaust Temperature & Inlet Steam Flow Curve of a Single Stage (Curtis) Back Pressure Steam Turbine where effect of Governor Valve movement on Exhaust Temperature is more evident. [ more ]
Registered Member Hello lux You have mentioned no obvious relation with Differential Temperature b/w Upper & Lower Casing and also you have mentioned Casing Temperatures of 400-410 Deg Celsius. May I ask how Casing Temperature is measured ? You have mentioned current behavior is not related to Process Loading. May I ask if the Turbine Inlet Steam Flow remains constant from the time Vibration fluctuation starts till the time it is vanished ? During Startup Temperature within Steam Turbine changes sharply... [ more ]
Registered Member Hello Dear All- Thanks for your kind comments above. For the casing expansion----Actually this was measured duirng the commissioning (at the beginning of this year), didnot find an uneven expansion from the readings of several dail gauges at that time. Also as I mentioned above, the vibration behavior is not related to starting mode. Even for hot start ( Time interval between shutdown and restartup is less than 1 hour), the temperature of casing compared to normal operting basically was same... [ more ]
See all 15 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
what is insensitivity check as per API
Registered Member I don’t think there is anything that API defines as an “insensitivity” test. Can you site a link that uses that terminology? [ more ]
Registered Member Dear Sir, Earlier i asked about sensitivity test, But now it is insensitivity check, can any tell which clause no. in API or explain in detail. Ravishanker [ more ]
Registered Member It isn’t “insensitivity” check, it is sensitivity check and you asked the same question back in April. See https://www.maintenance.org/to...-system-with-a-rotor For the responses from back then. [ more ]
See all 3 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Machine age vs vibration level
Registered Member A bathtub curve graphically relates three types of failure: early, random (constant failure), and wear out . Manufacturing and material defects typically result in early, rapid failure of objects: that region of a bathtub curve is called infant mortality. new machine also can fail as above infant failures. So age /vs how the machine is operated with respect to its design /vs maintainability of the machine FFT Spectrum gives you instant healthiness of the machine so no need to trend the... [ more ]
Registered Member Your results may vary! If a pump is built with proper parts balanced and has the correct shaft clearances and runout it may exhibit lower vibration levels than it the new baseline. I was just involved in a pump that was rebuilt 4 months ago. It was installed without motor shims. When the coupling failed four months later, it was found to be over .080 high. The alignment was corrected and the levels were down but not as far as I would have expected. The gross misalignment had taken it's toll... [ more ]
Registered Member But in our case Malcolm, age is getting to be more of a factor, especially when we consider buying green bananas. Best regards, JGW (BN-MDS 100% retired) [ more ]
See all 8 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Motor shaft broken
Registered Member ''Just running your numbers with an assumption in that regard, the calculator indicates the power is excessive for (10) 8V belts so I reduced the transmitted power to 100 kW (the calculator provides that guidance). Doing that yields a static shaft load at the recommended tension of about 17,300 N.'' 8 belt for 100 kw trails taken what is the vibration reading post it in this forum [ more ]
Registered Member As mentioned the center distance makes a big difference on the required belt tension. If you can move the motor further from the pump you will get more wrap and will require less belt tension. This with proper number of belts may help reduce the failures. [ more ]
Registered Member I would not reduce the number of belts without some further analysis including perhaps establishing the load on the motor (Becar has suggested that earlier). As I've already stated: "There is a belt tension calculator at https://www.mitsuboshi.com/eng...alc_tool/v-belt.html that does a good job in calculating belt tension and static shaft load. One variable you need is pulley center distance. I had calculated, based on the belt length and pulley sizes you provided, a center distance of 2180... [ more ]
See all 13 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Cement Mill Maag Gear High Vibration & Sound
Registered Member ... [ more ]
Registered Member I see by a video at https://www.youtube.com/watch?v=qBffsEtiBh4 that this is a relatively complex gearbox. It incorporates an axial floating shaft that is the gear of the 1st reduction and pinions that also have some freedom radially. All this is being done to insure good load distribution. As Becar has pointed out the attached document has nothing about the behavior of this machine. So we need the proper document and preferably a list of the bearings and tooth counts to properly work out... [ more ]
Registered Member I suppose wrong document has been attached. [ more ]
See all 3 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Effect of using an extension bar to collect vibration
Registered Member If you use a pole every time data is collected the data will be consistent enough to identify any issues. Don't worry about it. [ more ]
Registered Member Thanks for comments and sharing your valuable experience [ more ]
Registered Member I have basically always used an extension pole since the beginning of my condition monitoring career. Best I recall, it started back in 1987. Seems like just yesterday. Like the ole saying, "time flies when doing something you enjoy". The pole I used was 4 1/2 feet at its shortest length and extending out to near 10 feet. Had a swivel ball connection at the transducer mounting end and a 90 pound "pull", dual rail magnet on the transducer. Never ever had many, if any, signal problems from... [ more ]
See all 5 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Increased vibration level at engine firing frequency!
Registered Member As much of my resource material is quite old, I unfortunately I don't have the phase diagrams for any V-type engines. You should be able to get that information readily from the engine manufacturer. It will tell you if the "5x component (firing frequency)" is a major or minor order. You might try contacting them yourself, again you need the firing order which you didn't supply. With regard to the phase diagrams see the paper at Torsional Vibration in The Diesel Engine . The content is very... [ more ]
Registered Member Thanks John, will go through the paper. Firing order is 1-6-5-10-2-7-3-8-4-9 [ more ]
Registered Member Thanks John, its a 4 stroke engine with 'V' type configuration. [ more ]
See all 4 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
High spot
Registered Member The concept is similar for acceleration and velocity.. One must note that velocity and acceleration are not taken at the same location, since they are on the stationary component (unless using a shaft rider). More or maybe less, if the displacement has a 100 degree lag, the velocity should have a 190 degree lag - except that they are not the same measurement location. [ more ]
Registered Member You might want to read the content at https://dam.bakerhughesds.com/...ing-machines-pdf.pdf . Keep in mind that the high spot is the response of the rotor and that may vary as the rotor approaches and passes through resonance. There is also a “heavy spot”; that is a physical location on the rotor as opposed to a response. [ more ]
See all 2 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Is there any problem with my PeakVue Waveform?
Registered Member I use these three sets of parameter. the original from CSI. in according with the revolution velocity [ more ]
Registered Member I think the reason that it is useful to know the length of the waveform is to ensure that the lower frequency episodes can be seen. For example, in most cases the cage will do one complete revolution for each two and a half shaft revolutions. So if 4 cage revolutions are to be seen, then 10 shaft revolutions will be required. Ian [ more ]
Registered Member After looking back at old AP Sets (over 200) made by a client who uses wizard, CSI doesn't appear to default to a Special Waveform for Peakvue. Again, it is not wise to use order based Special Waveform options on Peakvue or Velocity on variable speed machines, as the HP Filter might go to a very large number and basically make the Peakvue and velocity waveform data not as useful had it been at a more useable lower number. As far as number of averages goes, I personally have used 1 average... [ more ]
See all 23 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
GRADUAL CHANGE IN GAP VOLTAGE TREND
Registered Member Much of what I've marked has been presented or determined by the OP. [ more ]
Registered Member If You present only GAP-DATA, I do assumption that all other data are typical – they do not change. If You present (with the GAPs) only RPM, I do assumption that typical PROCESS VARIABLES do not influence the GAP CHANGES (including VALVE openings). If You do a presentation of some DATA – obviously information about Xdcer’s orientation should be provided (as You did it with a delay). One additional data which are important and are not provided: information about type of bearings (the typical... [ more ]
Registered Member Dear FSX, Apologies. When digging out this issue, I am getting many new information. I am just two month old in this plant. There are no SDs after 2018. Even in 2018 SD, they just opened the compressor top cover, inspected and closed it seems as they had some issues related to seal removal / its spares. I thought that the ESD will change the shaft property similar to electrical run out and the shaft position is not really changing. I could not understand why this extreme shaft position... [ more ]
See all 22 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Overhung Mill With High vertical Vibration
Registered Member If welding is ok, have checked for soft foot possiblity. Soft foot can also cause high vertical vibration. [ more ]
Registered Member I have looked over every inch of this mill. Cant spot any broken welds or loose bolts. Im thinking excessive clearance on the shaft/Bearings. Can that cause directional vibration like that? id think the horizontal and vertical should be close to the same displacement. [ more ]
Registered Member Have you checked any welding that may be involved with the mounting? I’m thinking perhaps a crack in a weld that might not make itself apparent visually. [ more ]
See all 3 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Hump in an FFT spectrum.....!!!!
Registered Member These are clearly harmonics. Harmonics tend to make these humping patterns and it can be difficult to reproduce these in simulation, but thanks to some very good fortune I happened to simulate a distortion at 45° on a sine wave some time ago and got a very similar pattern. Notice that I mentioned the angle which is the crucial variable, that's Bullard Laws of Harmonics #2. The pattern of humps and notches is due to the phase angle where the distortion intercepted the sinewave. Everything... [ more ]
Registered Member Mathematically - oh that devil - one can show that pk >= rms. Take away some rms and the pk can go up. Example. Take a square wave. Low pass filter it (ideally) removing all but the first harmonic. The first harmonic has a greater pk or pk-pk than the square wave, but obviously it has a lower rms value because of the removal of the harmonics. I think that this has been discussed on this forum previously; someone may be able to find a link. [ more ]
Registered Member My point of view is that hump in FFT is multiple forcing function. The example that you present is a sine wave position, superimposed sine wave represent the raw data of waveform at diffrent direction and this will be will filtered to form sine wave for a better analysis,the hump in FFT with increase noise floor cause irratic or undirectional time waveform. Every forcing function have thier own time waveform to analyzed if it is a pure sine wave, irratic, undirectional etc. correct me if im ... [ more ]
See all 49 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Non-synchronyezed peaks at Main lube oil pump with BPFO defects
Registered Member Thanks for comment i gonna check the pump type bearing to confirm first and then we will make bump test to identify the Natural frequency of moto-pump. regards Anis [ more ]
Registered Member Dear ANIS VA , you have made a great consolidated report, from the data i am suspecting a pump bearing innerrace defect since, 8.56 is modulated with 1X, there are some cases we can get such strange frequencies with out matching with bearing fault frequencies. my suggesting for you to inspect any one pump bearings thoroughly [ more ]
See all 2 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Cat1 certification
Registered Member Re: Cat1 certification [ more ]
Registered Member Training hours should be part of the requirements. I have not seen them count real education in the subject. [ more ]
Registered Member I suggest you open the Certification Handbook at https://www.vi-institute.org/w...20-Cert-Handbook.pdf and specifically go to the bottom of page 9. [ more ]
See all 5 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
NSPECTR Manual
Registered Member Nspectr is still offered through Emerson's AMS Machinery Manager. But.. Will not be in the new AMS Machine Works software that is replacing MM. With that being said MM will still work like normal but there will no longer be improvements made to the software as the main focus is now Machine Works. It is nice having the artificial Art Crawford right at your side. -Chris [ more ]
Registered Member Don't know myself. I do know that the CSi brand is no more according to Emerson. You would need to approach them directly to see if they still support Nspectr. [ more ]
Registered Member Is the Nspectr program still offered and supported by Emerson-CSI? Walt [ more ]
See all 4 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Spikes in direct signal due to Possible Aliasing
Registered Member I no longer have the 3500 config software as I'm retired but as best I recall, the frequency ranges that are displayed (and user selectable) are a function of the transducer selected. In other words, should you select an accelerometer then you will be able to select a range that includes out to 10 kHz, or perhaps even more. Also, the best way to check for spiking due to electrostatic discharge is to view (with the 408) multiple direct orbits, and by multiple I mean 50 or more over a several... [ more ]
Registered Member Dear John, William & Walt Many thanks for useful inputs The Grounding Brush on Steam Turbine was connected to ground through an Ammeter. Ammeter resistance was found high and Grounding Brush was directly connected to ground and the Full Scale Spikes we were seeing in ADRE 408 DSPi vanished. However after some time we started seeing persistent increase of about 40 microns in Direct Value on all probes on ADRE 408 DSPi. However again there is no change in direct Vibration Value on DCS... [ more ]
Registered Member We both have a few "good" years at BN under our belt; even worked in the same office for awhile. I'll let readers determine the "good" years! [ more ]
See all 14 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Setting Parameters to Detect Misalignment
Registered Member Good morning, Flexible couplings can accept some misalignment before transmitting that force to the machine. As vibration analysis is the detection and measurement of force, then if the misalignment is not enough to impart a force to be detected then it cannot be seen in the vibration data. Thermal changes also play a role. If alignment is not measured while the machine is at normal operating temperature and compared to it's non-operating alignment then discrepancies can occur. Precision... [ more ]
See 1 reply...
Asset Condition ManagementPosts About vibration/alignment/balance
High 1x Axial at Motor
Registered Member was the case been solved? [ more ]
Registered Member Hi, in my experience when we have axial vibration on a fan like this or similar (belt drive for example), we check first the basement, to find if is well connected and the dumpers if have the same height, to avoid axial oscillation (like some table at restaurant) or you have to stiffen the baseplate (sometimes welding a X beam). [ more ]
Registered Member ❤️
See all 11 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
SCR Frequency
Registered Member I have 2 550kw DC motors, but the vibration is high when using 1 of these 2 motors. The spectrum show 300Hz at hight vibration motor (SCR frequency). Someone be able to tell me what troubles with hight vibration DC motor? Thanks! [ more ]
Registered Member As pointed out by others, it depends on whether the specific drive is six-step, etc. The real difficulty is that a LOT of drives out there particularly of fairly old vintage, get remarkably noisy, with respect to line frequeuncy generated vibration, at low loads, which can lead to confusion as to whether an SCR misfiring, etc. Another thing that particularly older vintage DC drives are senstive to is phase imbalance (voltage) on the input side....this can produce all manner of odd vibration... [ more ]
Registered Member Hi Jamie, Is this drive half wave rectified (3 SCR’s) or full wave rectified (6 SCR’s) You will always see electrical activity in the spectrum but I find it’s best to trend the values taking into account the loading e.c.t and don’t jump to conclusions, here is some info for you; DC Drive Problem Symptoms: DC Drive Problems typically show up on a vibration spectrum as amplitude peaks at multiples of FLine between FLine and FSCR. With a full-wave rectifier, this includes 2 x FLine, 3 x FLine,... [ more ]
See all 8 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Misleading inputs
Registered Member First of all the maker of the machine is the best source of information regarding alarm and danger set points. I also do not see any signs of ESD in the data you've presented. You might want to examine the document at https://dam.bakerhughesds.com/...-App-Note_R4-pdf.pdf and specifically page 13 (as numbered in the document). In the content you will find Mount the probes at the thrust bearing end of the machine and within 12 inches (300 mm) of the thrust bearing to minimize the effects of... [ more ]
Registered Member Any feedback regarding the above? The axial position alarm set points were adjusted with a very tight range. The cold axial float is 0.25mm, alarm set point is 0.25 and the danger is 0.38mm. I feel like it need to be adjusted to alarm 0.38mm and danger 0.50mm. AM I RIGHT? [ more ]
Registered Member Mr. John, I tried to gather more data as i can to determine the spiking in the orbit plot and the shaft centerline behavior. please see the PDF file attached. Regarding the probe mounting I couldn't get a solid answer to it. For this time I was able to get the steam parameters across the stages and all of them concluded that the rotor should move away from the probe. Inlet pressure: 41.1 Bar After 1 stage pressure: 22 Bar Extraction pressure: 10.5 Bar After extraction pressure: 5 Bar Exhaust... [ more ]
See all 12 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
ID FAN VIBRATION
Registered Member Checked DBSC of coupling for axial vibration and fire horizontal vibration need to check any crack in impeller shroud area..or any foundation looseness.. [ more ]
Registered Member Were you able to determine the sideband frequencies around so many of the "harmonics", including the 14x bladepass frequency? Thanks [ more ]
Registered Member First suction is for motor non drive side the second is for motor drive side the third is for fan drive side and fourth for fan non drive side [ more ]
See all 10 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Vibration limits for exhaust fan
Registered Member Thank you @Registered Member @Registered Member fan is operated by vfd motor through belt drive; nominal speed 800 RPM. [ more ]
Registered Member May we know the speed of the fan? [ more ]
Registered Member You might want to review the presentation at http://acc-usersgroup.org/wp-c...ibration-in-ACCs.pdf , especially the slides from #10 onward. Otherwise, perhaps think of purchasing the applicable ISO specification. [ more ]
See all 3 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
SSS Clutch High Vibe Shutdown at 20 MW
Registered Member Thanks for the update. We all learn considerably more when the resolution is shared. [ more ]
Registered Member I just wanted to say thanks for all the help! We found the problem to be that the feet had not been fully torqued by several hundred pounds! Runs smooth as butter now. I hope if anyone reports a issue like mine again this response will come in handy. [ more ]
Registered Member One of my engineers is talking to GE, nothing yet. What SSS wants is to have GE and Brush and themselves onsite to troubleshoot the issue, big dollars. I agree, SSS clutches are incredibly reliable, worked with them many moons ago. The proper channels are taking longer than i would like. I would like any info as to how a SSS clutch could act this way. Or any one who has perhaps had this event occur. [ more ]
See all 6 replies...
Asset Condition ManagementPosts About vibration/alignment/balance
Configuring collection specs and filters in EMonitor for low speed machines
Registered Member For the compressor, it runs at ~327 RPM, 6 throw, 2 stages. As for the transducer, it's an IMI. So far as I can tell, the cable is in acceptable condition; when used on other machines I get readings that A.) make sense and B.) are within 5-10% of readings collected using our second data collector. [ more ]
Registered Member Key question, already asked by Robert U, is "What speeds are you looking at on the compressors?" I see that the transducer has a frequency response from 180 to 540000 cpm so it's conceivable it would work. It does require a constant current power source (see attached, from the manual) so the obvious question is that being supplied? Is the cabling good? so an obvious ques [ more ]
Registered Member What is the manufacture of the Velometer? I looked up the an IMI EXVO622B01 and it comes back as a high frequency velocity sensor. What speeds are you looking at on the compressors? [ more ]
See all 3 replies...

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

Online Now

×
×
×
×
Link copied to your clipboard.
×