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Tagged With "Vibration"

Topic

0.6 pk IPS High Vibration at Large Axial flow pump

Ayaz Ahmed ·
We are facing high vibration an axial Flow Morris Type 54” MPAF pump which is designed for re-circulation of Caustic Liquid. This is an overhung design pump with no bearing support on the Non drive end side and pump is directly installed to elbow of a large pipe. Following are the specifications of equipment Flow: 20,000 m3/ hr. RPM: 242 Driver: 1185rpm, 530 kW Motor Driven through a Gear box and universal coupling Observations:- Highest Vibration at P1H (Pump Inboard Horizontal) of 0.5-0.6...
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A Typical case of Cracked Centrifugal pump Impeller with low vibration

chary tatta ·
Greetings team Attached case of cracked impeller in a ship ballast pump and the vibration is low. It appears 4 vanes for this impeller. Is there any way to identify such case through vibration analysis?
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ABNORMAL NOISE ON STEAM TURBINE GOVERNOR SIDE

white walker ·
hi guys, last two weeks i have been observing abnormal noise on steam turbine governor side.vibration at turbine nondrive and drive sides were maximum readings 4mm/s.actually we dont have governor casing vibration points.but today i checked with another tag points at governor side.i havebeen observed high vibration readings.this equipment is using for compressor seal oil screw pump and the pressure is 180kg.present rpm is 2000approx.rated rpm is 2985.operations informed me due to more noise...
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Abnormal peaks vibration of Hydraulic turbine

thi khuyen ·
Dear all, Kindly please suggest me for Abnormal peaks vibration My Fertilizer Plant has a Hydraulic Turbine (the HPRT) connected to a motor by a clutch, plays an important role in energy consumption reduction. 1. HISTORICAL BACKGROUND High vibration on the HPRT has been noticed since 2014. It was recorded abrupt increase, continuously and unstable high vibration on DE and NDE hydraulic turbine side in a certain period so we stop the HPRT for along time. Machine has been three-times...
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Abnormal polar plot phase change

amandalhl ·
Hi all, I observe increasing bearing temperature for one of the backpressure steam turbine that I’m monitoring. Usually the max temperature is approximately 88 degc and now above 94 degc. The increase changes with speed and load. Vibration trending doesn’t change a lot maybe 2 micron but when I look at the polar plot, it look strange. I’ve been reading a lot of post lately on maintenance.org And recall seeing something similar but can’t find the post. Have anyone seen similar polar plot and...
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Acceptance criteria for acceptable vibration levels on valve & actuator body vibration levels

RELI PREDICT ·
Hi All, Would be very thankful If any can share the reference to a STANDARD or a publication or guidelines addressing Acceptance criteria for acceptable vibration levels on valve & actuator body vibration levels. I can refer to EI guidelies / W&B chart for piping vibration levels but looking for something specific to valve vibration. regards
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Accepting resumes for Levell II or higher Vibration Analysts - Wisconsin

DGronski ·
We are currently accepting resumes for Level II Vibration Analysts, or higher, for permanent position in central Wisconsin.  US residents only, please.  Respond to doug_pti@yahoo.com
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Audit it. Improve it! Getting the most from your vibration monitoring program

Alan F ·
Hi everyone, My first book "Audit it. Improve it! Getting the most from your vibration monitoring program" was published a couple of weeks ago and I think it will be useful to many of you. The book fills in what I see as a major gap in training /...
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Axial Vibration increases with change of direction

CharlieRB ·
ue December 05 2017 08:06 AM All; We have a furnace with seven over hung fans bolted to the side of the furnace wall. To reduce a beat frequency every other fan is operating at a different speed, 1080 and 980 RPM. These fans operate in the clockwise and counterclockwise directions and herein lies the problem. All fans run well in the clockwise direction however, during the cycle the fans will change direction and run in the counterclockwise direction. Immediately the 1 times vibration...
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Atlas copco compressor concerning vibration values

Hossam 2 ·
Hello All  my case is an atlas copco compressor GA132w-10 fitted with 3000 RPm Motor ABB  number of male element and female element is not known but i suspect something will show you in the spectrum  ths the sharp frequency is 6XTS i think its related to blade pass frequency the the time diffrence between the impacts in the waveform =0.003418 second  so related to frequency =(1/0.003418)hz=17554.12 cpm if we check which order is this frequency we found that 17554.12/3000...
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ATOMIZER Vibration trend increse

Kishore kumar ·
Dear members , Please share your opinions about the equipment Motor spectrum posted ,no scope to take Vibration Readings on Atomizer Atomizer Motor Running at 2800 R.P.M & Atomizer Running at 8250 R.P.M ,
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4x Axial Vibration Frick Ammonia Screw Compressor

DaveyBoy ·
Hey everyone, I have a 3600 RPM motor (direct coupled) driving a Frick Ammonia compressor. Back in August 2019 all was good, when I took readings in October 2019 there was a high 4x spike in the axial direction (0.471 inch/s RMS). The alignment and coupling were in good shape. The motor was sent out for rebuild. The motor was re-installed about 2 weeks later and the 4x vibration had come right down (0.071 inch/s RMS). All other vibration was good as well. About a week and a half ago there...
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4x rpm peak in pump FFT

Akhil Rathore ·
hi I am monitoring a flowserve single stage, horizontal mounted, centrifugal pump, directly coupled to 180 Kw motor. Vibrations in the pump are higher in vertical direction with 11 mm/s rms @ pump DE & 7 mm/s rms @ pump NDE, hor & axial readings are below 4 mm/s, FFT shows presence of 4x rpm peak as the only culprit for this amplitude of vibration I have atrend of 1 year for the pump & it runs with same vibration amplitude & frequency domination in FFT. attached is the FFT...
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6000 v elecric motor high vibration

aziz58 ·
dear all i am facing with high voltage vertical electric motor as follow pole:6 out put:1250kw frequency:50hz speed:993 voltage;6000 v we have high vibration about 5.5 mm/s at 100 HZ de side.but at nde side vibration is 1mm/s. free run test was as same.phase measurement is fluctuated around the body and base.we mount the motor on the same another foundation but vibration was still exist .we decide run the motor on wokeshop on the ground and we put wood block under motor.we tun motor at...
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Ambient vibration impact on protection system

JJF ·
There is demolition and construction work scheduled in the vicinity of a rotary PD compressor with Bently monitoring and protection system. The radial and axial probes are armed to trip. There are also seismic probes mounted on the compressor cases...
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Amplitudes of Cavitation

Avinash Thawani ·
On Vertical Submersible pumps we are hearing alot of noise when we are near the machine. So what amplitudes are not acceptable and do cause cavitation on pumps
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AMS MHM ODBC SQL Syntax for External Integration?

JKF ·
Does anyone have any information on the SQL syntax for the AMS MHM CSI ODBC Driver? I've successfully installed the ODBC driver they provide and can retrieve data via Excel or Access. However, the ODBC driver does not appear to accept common SQL query syntax (e.g. Select Distinct and other grammar). I believe they are using Syware DeeBee ODBC Driver kit, as I receive a DeeBee error when using improper SQL statements ( http://www.syware.com/products/odbc_driver_kit/drdbdr3.php ). But their...
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An motor abnormal sound (power frequency 50hz) and vibration fluctuation with the dominant vibration frequency of 100 Hz

Vastocean ·
Hi guys, We are having an issue with a centrifugal pump which needs your advice. The motor has an abnormal sound, the vibration of both motor and pump are fluctuating from 4.6 to 5.7 mm/; the dominant vibration frequency is 100 Hz and the strange frequency range of 2800 to 3500 Hz appears. The brief information of equipment as follows: In May 2016, the vibration increased at both the motor and pump from 3 mm/s to around 6 mm/s and fluctuated from 5.3 to 6 mm/s, the dominant frequency at 100...
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Art Crawford books (SOLD)

John from PA ·
I just noticed on eBay a supposedly "new" set, volume 1 & 2, of The Simplified Handbook of Vibration Analysis by Art Crawford. In checking the site, I a ls o noticed they are autographed by Art. The price is $150 but the "make offer" option is available. http://www.ebay.com/itm/The-Simplified-Handbook-of-Vibration-Analysis-Volume-1-2-by-Art-Crawford-/331936610417?hash=item4d48f6b871:g:4d8AAOSwY0lXR
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AP/AL Sets are proprietary?

USMC 08 ·
I have an outside contractor collecting my vibration data and generating a report on a monthly basis. I have asked them to provide me with the AP and AL sets as a quality control measurement. They have claimed this to be proprietary information, and additionally, they also own the historical data because they own the database. Am I crazy to think they are way out of line? Disclaimer; There is not an internal spec written for how to collect data or how to define the parameters. Up until this...
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Analysis vibration of pump

Hassan engineer ·
hi friends can you help me to do the analysis of this pump. The measurements are true or not
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Analysis vibration servomotors

RAAL ·
Does anyone have any experience of monitoring servo motors using vibration analysis?
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Batch Sugar Centrifuge Vibration problem

Kishore kumar ·
Dear Members , We have a call to balance a Batch sugar centrifuge at Sugar plant ,But the Centrifuge is not respond to balancing .I have tried to balance with fastbal2 program in my csi 2115 analyzer and he Phase readings are near and showing wrong place to add mass .I have recommended to check for any assembly errors but the centrifuge basket already balanced on balancing bed with bent shaft ,they send the same .They changed the shaft but the vibration not controlled ,i have tried to...
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Bearing Defect Frequencies and Running Speed

Nitheesh ·
Hello, Most vibration analysis software have bearing defect frequency markers build into them, where you select the bearing and the fault frequencies are automatically matched. I also see that many software have these defect frequencies in Hz and Not Orders. (Eg: SKF NU 216 Bearing have 2.75 Hz as FTF, 22.9 Hz as FTF Also). And it appears to be a constant. So is bearing defects not related to running speeds? (Eg. NU 216 Bearing can be running at different speeds in different machines).
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Bearing Defect Frequency

Avinash Thawani ·
Hi, I have the following bearing details, kindly advise me what is the rolling defect frequency. I am running the speed at 19Hz. Hertz CPM Orders Shaft speed frequency 50.000 Hz Inner race defect frequency (BPFI) 247.501 Hz Outer race defect frequency (BPFO) 152.499 Hz Cage defect frequency (FTF) 30.938 Hz Ball spin frequency (BSF) 99.323 Hz Rolling element defect frequency 198.645 Hz
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1600 kW 3 Phase AC motor axial vibration

Mukesh Chandrawanshi ·
I have face a new vibration problem in 1600 kW AC motor which is associated with fan. in this equipment vibration is high in vertical & Axial direction in motor Drive End & Non Drive end vibration is more than 3.5 mm/sec in axial direction whereas horizontal vibration is 0.85 mm/sec. Motor has 8 pole , and that time running rpm is 337.5. Wondering is that we found a peak in vibration signature at 30337.5 cpm and amplitude value is 3.20 mm/sec . also find side band of 6.25Hz (337.5...
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1X AC line frequency excitation in Motor

The Maniac ·
A centrifugal fan 168 kW, 1480 RPM Overhung with Flexible pin bush coupling was running normal with vibration max 3 mm/s since 4 years. There was a sudden increase in vibration at 2x RPM frequency up to 8 mm/s inin coupled condition at motor NDE side Horizontal and fan NDE vibration observed max 3.6 mm/s with minor looseness symptoms . Motor Solo run was taken and observed with 1x Line frequency(49.97 Hz) observed dominant in spectrum with vibration observed up to 3.4 mm/s in motor NDE...
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1X up to 7X vibration observed

Hesam267 ·
Hi everybody i observed high speed compressor (42000 rpm) with high 7x (1x,2x,...,7x). machine semiopen impeller has 7 main blade too. this is my question: is it any relation? and what can rise all x? P.S - all bearing clearance found OK.
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2 Plane Balancing without phase

Avinash Thawani ·
2 Plane Balancing without phase How else is it possible?
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23 MW Steam Turbine Generator set - High Shaft & Casing Vibration on Generator Front Bearing

vipul@cmc ·
Rated RPM : 3000         Test RPM : 2500 ( No load , Without Excitation ) MW  Rating : 23  ( Russian Make ) Critical Speed : 1590  to 2100 Types of Bearings :  Journal Bearings Problems : (1)High Shaft Vibration on  Generator Front brgs. ( No.:3) ( Trip Value 180  Microns p-p)  machine tripping @  2600-2700 rpm taking while trials  (2) High Casing Vibration on  Generator Front brgs  10  mm/s...
Blog Post

Time Waveform Analysis and Statistical Comparison

Reliability ·
TrendOPeak OHealth system guarantees the continuity of operations thanks to its many AI powered algorithms. Everything is automated and designed to guide you without taking your valuable time.
Blog Post

Vibration Analysis Certification Survey

Reliability ·
Reliabilityweb.com, VibrationSchool.com and the Association of Asset Management Professionals are conducting a survey on Vibration Certification for a project we are working on. Please take less than 5 minutes to tell us about your Vibration Certification by clicking here: http://uptime4.me/vibecert You can participate anonymously or you can include request a copy of the survey summary once complete. Thank you!
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2x Axial Vibration

ConfMx ·
Hi guys, i,ve a problem with 4Poles Generator 8Mgw in Turbocompressor Solar Mars (Turbine-gearBox-Generator), High Level Vibration Axial NDE 2x (2x1800=3600cpm), 0.26 in/seg(pk). The Last test were with change Load level (decrement from 8Mgw to 0.5 Mgw), Decrease in amplitude is observed due to the change load level: 8Mgw, Level vibration @2x= 0.26 in/seg(pk), the last level (0.5Mgw)= 0.08 in/seg(pk). View Anex. Phases: NDE Axial 1x= In fase (4 axial points, 12,3,6,9) 2x= OutFase 90degres...
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3 M.W Steam turbine Vibration Limits required

Kishore kumar ·
Dear Members , We have a 3 M.W. back pressure Steam turbine on a Rigid Foundation ,Please suggest Vibration reference standards and Limits .
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3 M.W Steam Turbine Vibration Problem

Kishore kumar ·
Dear Members , We have observed increase in 3 M.W vibration trending running at speed 3000 r.p.m .Please refer the below attached spectrum and share your analysis .
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30MW CONDENSING STEAM TURBINE PEDESTAL HIGH VIBRATION

ramonruiz ·
Dear Experienced panel I would like to share one concern about high casing vibration (1x rpm) in horizontal direction of pedestal showed in picture attached. the vibration is 10 mm/sec -rms. the another Steam Turbine pedestal vibration is 1 mm/sec. the question are? 1.- can we allow this part of machine vibrate with this severity? 2.- can the grouting issue to be the cause of this high vibration? 3.- can some resonance frequency be the cause? 4.- can be possible this pedestal has design...
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3x and harmonics

MKarim ·
I have a double suction centrifugal between bearings pump. Its 3 pumps with 2 running and one standby config, with antifriction bearings at both ends and direct motor drive of 450KW, 60hz, 3 poles. Pump has 6 vanes. I am facing repeated issue of high vibrations after around 6 months of overhauling since commissioning 2 years back. Bearings are replaces and its repeated. Vibrations on all three pumps have similar pattern, high 3x and its harmonics at 6x, 9x. We have checked piping stress,...
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Air Handler Unit High Fan Free End Vibration

Avinash Thawani ·
Air Handler Unit Vibration Issue The vibration readings on the fan free end of the Air Handler AH-15050 have been significantly higher than the baseline during the last 20 days. RMS Acceleration has increased by 100% Raised noise floor in acceleration spectrum for Fan Free End. The spectrum peaks indicates a VFD speed change from 26Hz to 30Hz(gradually). Due to this change we are observing an increase in Accel RMS vibration. Currently the speed of the Motor is 28Hz. In the velocity spectrum...
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Agitator Vibrations Increase Trend

Kishore kumar ·
Dear members , Please share your analysis about this agitator at one of our client site Agitator 15 K.W Motor Running at 1460 R.P.M .
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Ballscrew Vibration

Jeff Lanning ·
Looking for some help on checking Vibration on a ballscrew and how accurate it is.
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Boiler feed pump high vibration at discharge pipes than pump and motor

chary tatta ·
Greetings team Please find the attached XL sheet is self explanatory. The boiler feed pump running with high vibrations and the discharge pipe vibration is much higher than pump side. Appreciate your feedback on this pump. Thanks and regards Chary
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Boiler Feed Water Pump high vibration

Vibration Analyst2811 ·
Dears, we have an issue for many boiler feed water pump. First,the NDE has 50 microns in 5100 rpm whereas DE has 20 microns.Second NDE and DE has 20 microns in 5700 rpm.These issue in 9 boiler feed water pumps and it began from of the beginning of installation. However, many pumps have been inspected and it found some of them have impeller damaged. regards,
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Bearing skidding

rcaser2009 ·
Hi everyone, Need your help or inputs on how to detect bearing skidding. Could anyone share some thoughts or how the spectrum looks like? Is it possible to detect using Vibration Analysis? Anticipate your replies Many thanks.
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Bearing VIbration Frequency Database

smartini ·
The Bearing Expert remains the largest single sourced bearing database. Over 800,000 discreet bearing part numbers with dimensions and related bearing frequencies for over 100 manufacturers worldwide. Used in over 60% of largest industrial manufacturers, as the data source for diagnostic and condition monitoring companies, by industry consultants and bearing manufacturers and distributors. Need bearing data for your analysis visit www.sourceindex.com smartini@sourceindex.com
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belt drive gearbox vibration

Hossam 2 ·
im facing a strange problem at the plant is that the drive set for the belt is vibrating excessively at the beggining of the operation but after while the vibration reduced sharply after 1 hour i will provide you by the complete data shortly
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Bruel Kjaer Vibro

Jaxn14 ·
Hi All, Does anyone have experience using B&K report & route manager software? Does anyone know how I can display order & hz/rpm simultaneously? cause I can only see amplitude with either order or hz/rpm (depends on x-axis unit chosen) when I mark a point. Also, how can I change the rpm for each data (i.e VSD) of a single point so that can use order. Can anybody shares their experience using B&K, the analyzer particularly VT-80 as well as the software. As I am new to B&K,...
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Causes of unbalance in rotating machinery

Maintenance Training ·
WHEN SPINNING EQUIPMENT IS OUT OF BALANCE When spinning equipment is out of balance. Vibration from out-of -balance rotating equipment can be frightening. The ground shakes, machines jump about, hold down bolts come loose and parts break. An unbalanced rotating body will produce forces on its bearings and transmit them throughout its structure and into the foundations. The drawings below provide examples of some of the problems listed in the table above. CAUSES OF OUT-OF-BALANCE Below lists...
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Cement Mill Maag Gear High Vibration & Sound

Garry Kristen ·
Hi, Found Abnormal Sound And Vibration from Cement Mill - Maag gear Input shaft Drive Side and NOn Drive Side also. Guys Please try to help me to sort out the actual reason for this vibration. Motor Drive Side: 2.3 mm/sec Horz Shaft Input Side: 10.52 mm/sec Horz Type: MAAG Gear LGD-32 , Motor 4552KW and 996 RPM I have attached all spectrums for your reference
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Centrifugal Basket Vibrations

Kishore kumar ·
Dear Members, Yesterday i have taken vibration readings of a Pharma Centrifuge (Mounted on flexible foundation) and i have found variable belt tension .And the dominating 1X peak (Structural Looseness) .I have posted vibration values Motor 1,2,3 of N.D.E H,V,A and 3,4,5 Motor D.E H,V,A and 6,7 are Centrifuge Basket radial readings taken on Bearings housing . Please share your feed back .
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Centrifugal Compressor - 3rd Stage vibration High & Trip

SMK -ALBA ·
Dear All, I am facing the problem in 3rd stage vibration high. compressor Model - ATLAS COPCO (Centrifugal) Ist stage speed -2980 R.P.M ( Vibration : 0.18 Mills) 2nd stage - 23476 R.P.M ( Vibration : 0.81 Mils) 3rd stage - 40106 R.P.M ( Above 1.15 Mils) ( Alarm 1 -Mils Trip 1.15 Mils) compressor tripping immediately after startup and setting time delay of 8 sec. from the panel found 3rd stage vibration high. Instrument check the healthiness of probe condition and found o.k. Mechanical check...
 
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