Tagged With "DE"

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high vibration on pump side

vishal sharma ·
Dear sir we are facing high vibration on pump side . give me suggestion to solve this motor de hv:2.3 mm/s vertical :2 .6mm/s axial 3.5 mm/s pump de side de:6.5 mm/s vertical:4.5 mm/s Axial:5.5 mm/s
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High horizontal vibration on gearbox

Engr Aamir ·
i have a dynamic separator fan in cement mill area. a motor, gearbox and a fan. gearbox has 2 shafts. i m facing 1x horizontal high vibration 8.5mm/sec and 8mm/sec on shaft 2 DE and NDE side. All other points showing less than 1mm/sec including Motor. also find attachment
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High Rms @ x1 Axial

P.Dunk ·
Guys/Girls if i could ask for some advise that would be a great help. I am pretty new to vibration analysis and i have come across what i think is a high reading taken from the axial position on the drive end bearing of a Kato 1540Kw Generator. From...
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seal air fan (Radial Fan) Axial Vibration

y@sh ·
hello guys, help me out from this problem the radial fan getting 7.6 orders and its harmonics . high vibration on axial side 17 mm/sec .fan have 11 no.of vanes and that 7.6 orders matching with bearing outer race but after checking the bearing outer races are normal and inner race clearances was 0.3 mm. i am unable to identify the this problem please,help me guys
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vertical pump

white walker ·
in my plant one vertical motorNDE and DE vibrtions are high.spectrum shows some looseness.1V 3.5mm/s nd 2v 5.5mm/s.please tell me ur suggestions wat will be the cause.BRG values are3.3gE at MDE observations :suction line not fitted properly.and flow issue also der. thanks in advance..
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Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
Hello Vb experts, here i attached damaged bearing images please give some possible causes of this catastrophic failure. bearing NU1052 -installed on May 2016.......damaged on Jan 21st 2017(Running time 7 month only) we inspected vrm motor in every fourth nightly , vibration and temperature parameters are in normal condition below 2mm/sec and below 75 degrees. but on January 21st we observed abnormal sound at Motor De side so we inspected the bearing with vibration analyzer.there is a sudden...
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Primary air fan High vibration in Motor DE brg.

TUSHAR000001 ·
PA Fan Motor DE vibration : 20 microns/10.5mm/sec Spectrum attached ,peakvue shows BPFO faults frequency
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High Floor Noise On Cold Rolling Mill DC Motor (1400 kW)

Onur Gün ·
With this datas, what is the problem? Is stage four bearing fault possible at NDE? NDE Velocity spectrum (RMS 1,39) NDE Acceleration spectrum (RMS 36,271) NDE Acceleration Time Wave (RMS 44,634) NDE Envelope spectrum (RMS 12,816) NDE Shock Pulse DE Velocity spectrum (RMS 1,37) DE Acceleration spectrum (RMS 2,837) DE Envelope spectrum (RMS 1,179) DE Shock Pulse
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Vibration observed on motor of sump pump

wss ·
High Vibration was observed on all axis of the motor on a sump pump MOTOR reading NDE V : 16.78 mm/s NDE H : 13.33 mm/s DE V : 8.76 mm/s DE H : 7.64 mm/s DE A : 2.84 mm/s PUMP reading DE H : 3.00 mm/s DE V: 2.47 mm/s I did a solo run on the motor and observed the following reading NDE V : 3.82 mm/s NDE H : 0.73 mm/s DE H : 0.17 mm/s DE V : 1.85 mm/s DE A : 0.21 mm/s I did alignment check up and was found ok Should I go for pump overhauling?I will also check for structural resonance. What...
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Generator Balancing Weight Location

ALI HAIDERR ·
Dear Experts, Please share any pictures of generator (~100MW) where balancing weights (Location of weights) are placed on DE and NDE for two plane balancing. Is there any ring available for placement of weights or it would be put on coupling? Regards
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Balancing of fan

vishal sharma ·
Dear all i am dealing with a RAW mill simple supported system fan 2500 kw motor with 990 r.p.m . The spectrum in DE bearing showing 1X with an amplitude 3.8mm/s overall vibration is 4mm/s in DE bearing in horizontal direction. vertical: 1.2 mm/s Axial: 1.4 mm/s but at NON DE side bearing we are having 5mm/s overall vibration in horizontal direction. the spectrum in NDE bearing showing 1X with an amplitude 3.9mm/s . vertical vibration is :1.8mm/s Axial: 2.4 mm/s by doing time wave form...
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Vibration at 5X NDE AND DE V for Centrifugal Pump

wss ·
Vibration was observed in a recently overhauled centrifugal pump in 5X at pump NDE and DE V.FFT is attached There is no chance of vane pass effect since the pump was overhauled recently and no damages where observed.
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Double hydraulic oil pump with induction motor

Raul Rios ·
Dear friends! In the next day I will analyze a system that is composed of an induction motor of 60 hp and 1750 rpm. The motor has two DE (drive end) where two oil-hydraulic vane pumps are coupled on both sides. It's the first time I get this kind of arrangement. What should I expect in the spectra? Does anyone have experience in this type of arrangement? Is it advisable to make measurements at 100% load or 0% load? As always, thanks for your good comments! Sincerely,
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Vibration analysis

Tsietsi ·
below are the data for the industrial motor coupled to a centrifugal pump motor speed 1487RPM bearing are white metal bearings both NDE and DE power is 970 kW please assist me with the analysis attached there is a funny noise from the motor when running
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Strange harmonics on horizontal pump

Kamilu ·
Hi all, it is my first post here, thank you in advance for all the answers. I have been monitoring 45 kW pump, ~1480 RPM and i have seen strange harmonics approx. at ~6,31 RPM, strongest on DE pump and motor side. I have checked bearings in manufacturer catalog and it says that these should be : Motor : 6313 DE/NDE Pump: QJ 313 DE / 2213 NDE None of the bearings fault frequencies match with 6,31 harmonics. The closest one are 2x BPFO motor bearing at 6,142, and pump BSF at 6,661. Pump vane...
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Stronger vertical than horizontal NDE side and the opposite DE side.

Kamilu ·
Hi. What could be possible, general reasons that there is much larger vertical vibration than horizontal NDE side of a machine, and much larger horizontal vibration than vertical DE side? Ratios are about 3-4/1. And what if there is opposite of this situation? (stronger horizontal NDE and vertical DE)? I experience this pattern on two sets of machines (motor +fan). They are driven via belt transmission. One set (motor + fan) is experiencing the first way, and second set of machines is...
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High Axial vibration at BPFO frequency in Simple supported type centrifugal fan.

Vibration_guy ·
Dear All, I'm facing High vibration issue in my FD fan. The attached excel sheel have all the details. Maintenance History- Before PM the vibration of Fan DE was normal, But after PM high axial vibration observed at fan Driving End. I don't have spectrum of that as i was on leave , so my maintenance department decided to change the bearing. But after Bearing change the vibration problem was not resolved. SO they waited for me to come. So when i came i saw that Horizontal vibration levels was...
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High Radial Vibration on Water Injection Pump (WEIR PUMP)

Ken5yne ·
My Fellow Colleague, Been battling with a water injection pump for weeks now, the pump is a centrifugal multistage pump with 6 stages driven by a siemens electric motor through a lufkin gearbox . The pump had failed early this year due to process issue, pump was run for a long time without load, signal was sent to the breaker to trip pump, but it did not trip, luckily the pump was hand tripped by an operator, when we started, the pump refuse to turn, so we got another bundle which has been...
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Re: seal air fan (Radial Fan) Axial Vibration

Walt Strong ·
" that 7.6 orders matching with bearing outer race but after checking the bearing outer races are normal" You have outer race fault frequency with 1xSS sidebands (modulation), so it sure looks like an outer race fault! How did you or someone actually "check the outer race"? Most bearings require destructive disassembly (cut apart) to actually see the full bearing race surface. Don't get lost in a pile of data! Walt
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Re: seal air fan (Radial Fan) Axial Vibration

Shurafa ·
Were these spectra collected before after the "bearing checks"? Did you replace the bearings or you reinstalled them? It looks there is a bearing defect. Regards-Ali M. Al-Shurafa
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
Above spectrums are After checking the bearings and alignment and we find inner clearances but there is no outer race defect physically
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
We check the bearing clearances with feeler gauge inner and outer
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
We disassemble the both de and nde bearing and checked physically but there is no Outer race defect
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
bearing images
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
BEFORE ALIGNMENT
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Re: vertical pump

rgf12 ·
If you want feedback that is not just speculation please post equipment information (speed/bearings/motor info) and any data you have. There is a lot of heavy experience here but they need something to work with. In God We Trust All Others Must Bring Data.........
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Re: seal air fan (Radial Fan) Axial Vibration

electricpete ·
[quote] inner race clearances was 0.3 mm.[/quote] Can you explain more about this measurement? I hope it is not between bearing and shaft (that should not be clearance) What style bearing is it?
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Re: seal air fan (Radial Fan) Axial Vibration

montaser ·
I advice you to make mark using (correction pen) between the bearing outer race and lower part of housing and another mark between bearing inner race and shaft, and keep the fan running for some hours, then stop and inspect the marks position for the possibility of bearing rotation inside the housing.
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
Tnq for reply its not b/w shaft and bearing ,clearances are b/w balls and bearing inner ring.
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Re: seal air fan (Radial Fan) Axial Vibration

y@sh ·
thank you sir but it is a heavy equipment . so,it's impossible to open the machine at present conditions.
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Re: seal air fan (Radial Fan) Axial Vibration

Jim1 ·
Oil filled housing? Did you sample the oil? What caused the satin finish on the rollers and inner raceway?
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Re: vertical pump

white walker ·
motor rpm=2930 30HP 22KW,amp=37 brgs=L.s=NU312C3,O.S=7312BDBC3. please find attached file of 2V spectrum.here i am geting more vibration
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Re: seal air fan (Radial Fan) Axial Vibration

Walt Strong ·
Y@SH, I looked at your three photos. None of the photos show the surface of the outer race/ring that is in the contact path of the rollers. The bearing would have to be destructively taken apart to do so. Therefore your limited inspection does not prove or disprove an outer race defect. The only way to do that would be to remove the grease and cut the bearing rings apart. You can save that activity for a later date when you change the bearing. If you actually put in new bearing when those...
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Re: vertical pump

ahmed metwaly ·
I think it may be the bearing loose in housing.
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Re: vertical pump

Walt Strong ·
It may not be a motor bearing, so measure vibrations during an uncoupled run if possible. A motor bearing is easy to replace compared to a pump bearing or wear rings. Walt
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Re: vertical pump

white walker ·
suppose if there is no issue with motor bearing.what is the further procedure.if there is problem with bearing.it should effect in envlope reading.but here i didnt see this problem.
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Re: high vibration on pump side

chary tatta ·
Dear Mr. Vishal Greetings The information is insufficient to give correct analysis. As per ISO recommendations, pump capacity or kw range, satisfactory vibration levels the condition is decided. To identify the source of vibration please send the time and FFT drawings. regards chary
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Re: High Rms @ x1 Axial

Edwin de B ·
Do you have any comparison with previous values or other simular equipment? Diesel engines can generate high vibration without anything wrong. If there is an increase in axial vibration, especially 1X and, as i see in your spectrum, harmonics of it, you should check the alignment and if the coupling rubber got hard by aging.
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Re: High Rms @ x1 Axial

P.Dunk ·
Hi Edwin firstly thanks for your response. I have done 5 other generators which are the same. Same mount arrangement same load etc maybe 5-6 rpm difference. I am getting Rms values ranging from 5.223 being the lowest to 6.612 the highest which all seem to be consistent. It just got alarm bells ringing in my head with the high reading of 8.41on the generator which is basically an emergency back up generator with the least running hours on. I have initially advised alignment checks to be...
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Re: High Rms @ x1 Axial

John from PA ·
I'm not sure about the Vulkan coupling but on a competitor type of coupling in a diesel driven test stand application there was some recommended maintenance in the form of application of a rubber lubricant. We used to do this every six months. It was a relatively simple task that involved unbolting a plate and spraying rubber lubricant on the rubber blocks. It might be worth checking if the Vulkan has a similar maintenance procedure.
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Re: High Rms @ x1 Axial

zhouyh ·
I see many 0.5 x harmonics, which diesel engine produces.
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Re: High Rms @ x1 Axial

Ron Brook ·
P Dunk, You are suggesting the two best causes for an elevated axial on a Kato gen set. Usually the lowest of the vibration readings. Ron Brook
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Re: High Rms @ x1 Axial

STEAVE ZAZOU ·
Dear P Dunk, you have to look on your trend,if it's increase you have to be worry,we have for 3512 gen diesel pump,rms is on axial is 14mm/s but the trend at the begining is steady,just contunie to monitor it
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Re: High Rms @ x1 Axial

John from PA ·
Originally Posted by P.Dunk: From what i can make out i am getting my main peak at x 1 running speed and there after. I will upload the images. The generator is driven by a caterpillar 3516 diesel engine. Engine and generator are spring mounted. Generator speed is1202 Rpm. Coupling is a vulkan solid rubber spider type. I noted with interest that you state that the predominant vibration is in an axial direction referred to the input shaft. Comments (including my own) so far have been about...
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Re: Balancing of fan

vishal sharma ·
the problem has solved. we did two plane balancing now the vibration reduced from 7mm/s to 2 mm/s. fan DE: 1.8mm/s fan NDE: 2.1 mm/s thanks for your suggestions.
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Re: Balancing of fan

Walt Strong ·
Vishal, Thank you for your feedback. Walt
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Re: Vibration analysis

Walt Strong ·
What does funny noise sound like? Did you measure sound to determine the dominant frequency? Do both the motor and pump have journal bearings (white metal), or perhaps the motor has ball/roller bearings? Walt
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Re: Vibration analysis

Rotating Guy ·
TSIETSI Hi, below comment is for clarification; 1. Does the funny noise occur during start-up? 2. Does your attached spectrum is taken during your so called funny noise? 3. Does the funny noise didn't disappear during operation? 4. Whats is the recorded enveloping acceleration for motor drive side and non-drive side? also the timewaveform? any significance changes in trend history? For me, when i encountered abnormal noise like a sound pressure noise at motor, i do phase analysis for motor...
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Re: Vibration analysis

Kishore kumar ·
Dear Tsietsi , Is that motor has a fan along with internal air circulation type ? , if so it might be due to air circulation or air turbulence issue with in the Fan casing . Did taken Fan reading while decoupled ? , is there any sound like this ? Please check these parameters and share your motor image . <form action="https://www.maintenance.org/record-share!execute" class="" data-ajax-form="" id="shareContentActionForm" method="post" name="shareContentActionForm"> </form>
 
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