Tagged With "in"

Topic

ACCEPTABLE SHAFT VIBRATION LIMITS

Vibrant ·
Hi Experts, Can anyone give me what is the acceptable shaft vibration limits with ur experience and by standards for newly installed Expander with 10000 RPM and for Gas Turbine with 4700 RPM. If you need further information on these Equipment details,...
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Is it 1xLF in VFD driven motors?

David_G ·
It appears that it is a pattern that motors running off of a VFD develop 1xLF, as oppose to 2xLF, sidebands around RBPF in normal spectrum and 1xLF harmonics in the demodulated data. Refer to the attachment. I am not 100% sure the above statement is...
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Acceptance Test Gearboxes

vibesmith ·
I was wondering how other people rate a new or rebuilt gearbox on acceptance testing. what level of gear mesh and what level of sidebands are acceptable. Is a low level of modulation ok or not. These are large gear boxes Philadelphia 11Q and 14Q and...
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Abnormal vibration at bearing housing of hot oil pump

Nguyen Ba Triet ·
Hi everybody, I have hot oil pump at GPP plant (please download attach file). But now it has abnormal noise and vibration in bearing housing. After that I change new all bearing pump, new oil lubricant,check the coupling and pulley, change new bearing...
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Residual Unbalance, API610/617 and ISO-1940

Arief2072 ·
Hi, Need your opinion on determining residual unbalance. We have blower with 240 Kg and 420 mm radius, running speed 3000. Supported by 2 bearings. Due to its length and overhung arrangemnet, we need to do at least 2 plane balancing. Permissible...
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quiz

SUDIN ·
1)when a rotor is passing through the critical speed...Why does the phase angle shift by 180 degree only and not 270degree or 360degree or something else??
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High Frequency Displacement

Jeremy2104 ·
Background: I collected machine-housing vibration on a large Vorecon fluid drive. In a certain speed range, 5525-5580 RPM output, an internal resonance was identified. Essentially, the resonance is excited by the 2nd harmonic of Gearmesh Frequency....
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Need vibration specilaist in UAE

abdulla ·
We urgently need few Vibration analyst expereinced in refinery/Oil and gas/ fertilizer. Good pay scale and leave cycle.Asians preffered.Please send your CV on abduma@rediffmail.com
Topic

Procedures for PdM and CM

Menwi ·
Hi, I am trying to develop PdM and CM work procedures for some equipment such as centrifugal pumps. Areas I am focussing on are inspection, vibration monitoring and analysis, coupling inspection, alignment, lube oil analysis, mechanical seal, steam...
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Rockwell Automation’s Dynamix System

Carson ·
Does anyone have any experience with the Dynamix (A.K.A Entek XM120) monitoring system? I’m familiar with the old standby: Enwatch. We have that on a small group of machines. We need to monitor a much larger set of machines, namely dryer and...
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Next/Previous Discussion tabs

Danny Harvey ·
Is anyone else missing tabs for next/previous discussions or is it just me?
Topic

Bearing Cross Reference

jim2f ·
I am having trouble cross referencing some bearings. Can anybody tell me how to decipher GE motor bearing numbers. I have some AFBMA cross reference guides and a few other resources for cross reference but I am left baffled by GE. I am currently...
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Dodge Imperial Bearings Down Time

Rockin' Rod ·
I have a general question about the Dodge bearings again. One of our units was down for about 6 weeks due to some major maintenance. Bearing data all looked great and in the green prior to the shut down...Unit was started back up yesterday. I took a...
Topic

Borescope inspection of bearings in gearboxes

RoadKen ·
Hello All, I have a group of rolling mill stands that I have been monitoring approximately every 6 months for aout 10 years. The past 6 years we have been using a Commtest VB Series analyzer. There are a total of 16 stands which alternate between...
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Polarization Test Question

Testtech ·
I regularly conduct PI tests using a PDMA MCE 3000. This instrument shows the megohm results on a time plot at 10 second intervals for 10 minutes. I find this display useful. I have had examples of failing motors that passed a single value megger...
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High Horizontal vibration of Motor in no load

bsjhala ·
In load vibration measurement of a horizontal motor vertcal and axial vibration at DE and NDE are of order 3 mm/s pk while horizontal vibrations at both DE and NDE are of order 14 to 15 mm/s pk. What is the cause and remedy of horizontal vibrations ???
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Analyst needed in Midwest area USA

Buddy Morris ·
I know this is the most visited "board" on this forum and this is why I am posting here as well as on the resume board. Our company is looking to hire an analyst located in the Midwest. Not a contractor or sub-contractor, but an hourly or salaried...
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Accelerometer is used for higher frequencies whereas Disp used for Lower freq! Why

Khalid Khattak ·
Following are the equations of Motion for a sinusoidal wave: Displacement: X= A Sin( wt) Velocity: V= Aw Cos(wt) Acceleration: A= -Aw^2 Sin (wt) where A= Max. Amplitude Now the question is that for a single frequency and constant Amplitude, the...
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Why the Reference Voltage to Displacement Probe is in -Ve values?

Khalid Khattak ·
The refrence voltage (Gap Voltage) in the sleeve bearing for displacement probe is measured in -Ve!!! Why -ve value? Please some one enlighten me.
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Transformer Monitoring

rgf12 ·
Does anyone have any references for acoustic monitoring of main transformers? I'm specifically looking for information on interpertation of acoustic signals taken on transformer walls.
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Electrical fluting bearing defect

Kevin Ku ·
Hi Sir, We have one bearing from VFD AC motor inspected and noticed with electrical fluting. We already have grounding strip on shaft, why we still have this kind of defect? See Attached for details. Thanks,Kevin Ku.
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Conversion factor for pcmb/g

Danny Harvey ·
I have a couple of accelerometers and have been given spec for them as 8 and 3 pcmb/g with capacitance of 600 and 550 pF. I guess these are pica-coulombs and pica-farads but from what I can find coulombs cannot be directly converted to volts. Any...
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Non Contact Eddy current Probe- AC/DC dilema

Khalid Khattak ·
Somewhere i studied that non-contact eddy current probes have two components AC and DC.. For response vectors, the AC component provide the data whereas the DC component is not used ..The DC component is only used for getting shaft center line data......
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What is Sample rate?

Khalid Khattak ·
Can some one explain 1- sample rate is that = No of samples collected/ sample time Regards
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VIBRATION CAT 3 EXAM

vibramac ·
Will be undertaking this exam in 2 weeks, is there any post papers one can review or any test one can undertake to assess ones performance?
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Motor Standards

subsguy ·
What exactly is the difference between a NEMA Premium Efficiency rated motor and an IEEE 841 motor?
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KOYO brg. fault frequencies

Robert U. ·
Does anybody have the fault frequencies for the following bearings? Mfg. KOYO 6211,6313 and 6314 deep groove ball bearings.
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Peak-vue set-up for CSI

ray griffin ·
Can anyone please tell me the point set-up and AP set up. Help
Topic

Vibration Transmitters 4-20mA

VRG ·
Dear Members One of my clients has a doubt that low frequency vibrations cannot be converted effectively to 4-20mA signal. The application is to monitor low freq. vibrations ( approx. 80 - 100 cpm ) coming out of low speed agitator output shaft....
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Why does this show up in peakvue but not in conventional readings?

Randle ·
I have a very large pump (1200 hp motor) that developed an outer race defect on the outboard pump bearing after the inside of the pump was sandblasted. It was noticed as soon as the pump started up after shutdown. I assumed that a piece of the shot...
Topic

High 1X vibration in axial direction in FD fan

Anurag ·
Pls help in identifying the probable reasons for high axial 1X vibration-(13mm/sec) in case of FD fan. It is between bearing fan having antifriction bearings(SPHERICAL ROLLER) at both ends.Axial 1X high at both ends with similar amplitude of around 13...
Topic

IRD 890 Spectrum Analyser

Vibe-Rater ·
Hi Board, Apologies if this is not the right area to post for this but could not find a better place. At a client site found a room, yes a whole room, that no-one (except big boss) knew existed. Opened cupboard and voilla, an IRD 890 analyser. Did not...
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Training on Partial Discharge

Aditya ·
Does anyone know of organizations that conduct formal training on Partial Discharge Analysis? I am aware of Iris but I would think that their course would be specific to their equipment. Please advise if Iris or Doble offer generic training. Willing...
Topic

vibration in Boiler feed motor

apparao ·
Dear friends we have Boiler feed pump Motor of 1600 kw running at 3585rpm, recently Electrical maintanence overhauled during annual turnaround(inspected brgs ) , ater O/H Motor solo done and we noticed more vibrations on Motor De side...
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CSI 2130 V/Tach pinouts

Simon Rivers ·
We recently upgraded from a 2120 to a 2130 and I need the V/Tach pinout info so I can rewire my tach. Thanks
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meg testing at rated voltage

delly ·
We have been disussing the pros and cons on testing insulation to ground at rated voltage vs. testing at 24 volts. My question is: Is testing at 24 volts good enough or should we be testing at rated voltage? IE: 4160v motor tested at 24 volts or...
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Difference between radial displacement probes and axial probes

wookp ·
What's the difference between a redial displacement probe which measures in microns and an axial probe that measures the shaft distance in positive and negative values of mils? Is it possible for us to evaluate the vibration axially?
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Shaft Failure Analysis

Danny Harvey ·
Who is available to do shaft failure analysis? The shaft in question is located in the Atlanta area but can be shipped by UPS.
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Failure Analysis on shaft

Danny Harvey ·
Who is available to do shaft failure analysis? The shaft in question is located in the Atlanta area but can be shipped by UPS.
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NSK BEARING

Brickbat ·
Does anyone have the fault frequencies, or physical data for a NSK EP3313?
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One more case of a broken shaft

David_G ·
The shaft broke at the keyway area. Actually this is an extention shaft connected to the main via a rigid coupling and there where it broke off. Up the power train there is also a flexible grid coupling connecting to the GB output shaft. Please pay...
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equivalent material

apparao ·
Dear friends i need information regarding c45k steel equivalent material urgently for which thank ful to all regards Apparao
Topic

Filtered orbit plots

Vibe-Rater ·
When displaying filtered orbit plots (CSI) what do people normally use as upper filter setting for displacement? And would different settings be useful for velocity & accel?? rgds.
Topic

Weird Peaks at Generator Front Vertical Bearing

hiz ·
Guys, Again, I have to ask for your opinions. I'm seeing spikes (random peaks) on my generator front bearing at vertical direction. I initially thought it was due to sensor problem since im not seeing the peaks at horizontal. Then a friend of mine...
Topic

Peak Vue V/s Envelop Acc.

Rao Shahbaz ·
Can any one tell me that peakVue iz better tool to monitor bRG HEALTH MONITOR OR Envelop Acc. filters are good one?
Topic

"typical" sleeve bearing motor vibration

Dan Timberlake ·
I'm used to sleeve bearing devices having pretty clean spectra gathered on the bearing housings. Here are spectra of a 1500 hp 1800 rpm motor driving a gearbox thru a grid flex coupling with limited float kit, then a big pump. The motor has harmonics...
Topic

Fan Walls

cranus ·
Does anyone have any experience with remote accelerometers on Fan Wall Air Handlers? I am trying to spec this out and not sure what is best. It is my understanding that the motors run at greater than 60hz.
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Help with setting up shaft voltage route in RBMWare

Danny Harvey ·
I am trying to set up a route to measure shaft voltage in a bunch of dc motors using the 348sp shaft probe and my 2120a-2 data collector. I built a measurement point using the shaft voltage AP set in the Example Database. I have told it to turn off...
Topic

3-Stage Joy Compressor

ColdTurkey ·
Hi there, Does anyone have case study information on diagnosing a 3-stage integrally geared compressor. I understand using high frequency accelerometers are a definite advantage but does anyone know any other tricks or tips? What are typical failure...
Topic

SKF Machine ODS

Aubrey ·
Has anyone used the SKF Machine ODS software? We may be changing data collectors and this is the software of choice "salesman's words" for the system. Thanks, Aubrey
 
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