Tagged With "DE"

Topic

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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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: 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

kioomi ·
Dear P Dunk, where can i buy Bearings:- DE- 012-52260-00, NDE- 012-52260-00?
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Re: High Rms @ x1 Axial

John from PA ·
Originally Posted by kioomi: Dear P Dunk, where can i buy Bearings:- DE- 012-52260-00, NDE- 012-52260-00? I'd start a new thread on this request, especially since this thread is titled "High Rms @ x1 Axial". I would also add the manufacturer name and the machine details to whatever bearings you seek.
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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: High horizontal vibration on gearbox

John from PA ·
I see some impacting going on so I would suggest as a 1st step examine the condition of the teeth. Usually you don't have to disassemble the gearbox but you may have to do some searching to find a means of inspection. That might be a small plate bolted to the casing or in some instances I have even seen relatively large pipe plugs that when removed permit viewing the active contact area.
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Re: High horizontal vibration on gearbox

subh ·
2 shaft means what ... is it the output of gearbox.. M unable to see ur attachment... please send it in JPG form.. If the output shaft is having 8 mm/s vib thn it might be possible that separator blade is getting unbalance
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Re: repeated bearing failure for screw compressor

candy ·
Only 2 failures of the same bearing so far?
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Re: repeated bearing failure for screw compressor

RE-Engineer ·
this pump was overhauled last April and again the same failure occurred in July. previously four pumps have similar shaft jamming. same scenario
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Re: repeated bearing failure for screw compressor

RE-Engineer ·
Yes I just replied. Thanks, Regards,
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Re: repeated bearing failure for screw compressor

RE-Engineer ·
possible causes: 1\ insufficient cooling: the screw pump has cooling liquid jacket so that the the liquid flows into the pump and cool it down. The outlet temp of the cooling liquid is around 80C (did not check the inlet) so i thought may be it is appropriate to install chiller to cool down the cooling liquid (the pumped product in our case Paraxzylin) today we had a meeting with the vendor and surprisingly he said the cooling is optional (the pump can run at 150C without cooling) which...
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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.
Topic

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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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

Mukesh Chandrawanshi ·
Have you any fft signature before bearing damage i.e. before 21 January..... If you have ...send the fft pic of motor DE bearing .....
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

Alvin MC ·
Looks like inner ring spun on the shaft. I would check the fit. Did it damage the shaft?
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
i don't have a pic of FFT but Dominant peak is 1X and presence of 2X , 3X and bsf harmonics with its side bands.the velocity values are in with in limits only but how this catastrophic failure happened in 7 months period.
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
After inner ring crack its spun on the shaft.shaft is OK
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
This is Vertical cement raw mill motor , there is a presence of high impacts and high temperature also its look like thermal crack for me.is there any chances like failure due to temperature in lesser period ?
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

Dave Reynolds ·
The shaft is undersized, this allows the inner race to deform because there is not enough contact to stop the inner race from deforming. The size of the KW would also tell me there are several thousands of lbs of weight on the bearing If the part of the bearing inner race that contacts the shaft was very clean then I would say the shaft was oversized and this would cause the inner race to crack http://ctcbearings.com/ctc%20b.../FailureChartpdf.pdf Looks like you could have electrical...
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Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.

y@sh ·
Re: Cement mill VRM MOTOR 5500KW DE bearing inner ring crack with out any vibrtaion severity.
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