Tagged With "Vibration"

Topic

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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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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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...
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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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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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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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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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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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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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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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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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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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Cooling Tower Fan High Motor Vibration

Andy$ ·
Dears, We have a CT made by 22 cells, separated in 2 Blocks. Last week one of them tripped because of HH vibration on the Motor side (the limit is set to 9mm/s). I checked the spectrum and I found a “strange” frequency that I have never seen on these fans (around 88Hz). The behavior was confirmed by the SKF portable instrument. The speed of the motor is 1485 rpm and fan speed is 106 rpm (6blades). I suspected some looseness so I suggested to make an inspection, looking for some loose bolts...
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CSI 2130- testing Vehicle cab vibration

Vibsouth ·
Hi Guys we have a 2130 and would like to test the in-cab vibration of one of our ve hicle's. The reason why is that we have changed the tyres to a harder compound and the operators are feeling more d iscomfort, so I have been asked if we can test the vibration. Is there some way I can get the 2130 to run for 60 seconds or so to collect a continuous waveform? Thanks
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Cyclo reducer vibration

tcvib ·
Everyone, Found this white paper on Cyclo reducer vibration analysis and thought it was good info for us.
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Diesel Fire Pump

oju ·
Does anyone have specifications for Vibration levels on diesel fire pumps? Also for those who do reciprocating engines what are the levels you should expect to see 2xRPM at under general load conditions?
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Digivibe MX M30 vibration analyzer

Abdul Qadir ·
Is there any user of digivibe tools of erbessd instruments? are they worth investing for feild vibration inspection services & dynamic balancing services ?
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Drawing mechanical software for vibration analysis support

Alvaro Loayza ·
Hello everybody, I'm trying to make mechanical drawings for diagnostic in our equipment like multiple stage gearboxes, multiple stage screw compressors, etc. I would want to introduce information like bearing code and number of teeth. An idea of what I want to make is attached. I was going to make this on AutoCAD but is there any software with libraries to just introduce information? Thanks to everybody. Greetings.
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Elevator Vibration

Spkrman15 ·
Are there any Wire rope experts? I have a been hired to do a vibration analysis on an elevator deflector sheave as the customer believes it is vibrating and sending vibrations to the building. I am getting a reading that I can't track down. Some information On the motor RPM 37 (0.62hz) Peak of 0.18 mm/s @ 19.46 orders (12hz) On the deflector sheave Peak 1--> 0.09 mm/s @ 120.81 orders(74.5hz) Peak 2-->0.09 mm/s @ 140.27 orders(86.5hz) Difference of 19.46 orders (12hz) There are 4...
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Frequency Bandwith

Avinash Thawani ·
Do you think market is large for sensors with 2kHz band width?
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GT SGT600 PT bearings 3 & 4 High Vibration

Hisham4ever ·
Dears, We have experienced dramatic change of vibration over GT24 "SGT600"  where bearing 3, 4. We have stopped the unit and start it again and vibration trend still high, specially bearing 3. We also carried out NDT test on PT coupling shaft but found no trails for cracks! The high vibration parts are shown in following schematic:     the attached files contains all the required data. any suggestions about this?? it will be appreciated   
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High Vibration due to flow turbulence

Muhammad Faizan ·
When Turbine driven boiler feed water Booster pump was running on recirculation(minimum flow condition) the vibration readings at pump DE and NDE vertical were very high but when pump started to give flow to turbine driven pump(Main Pump) its readings drastically dropped. I saw the spectrum the peak is exactly at the vane pass frequency. Therefore it is suspected that this is purely due to flow turbulence when pump is running in minimum flow condition. (See Spectrum in attachment) Any one...
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high vibration in compressor

vishal sharma ·
dear all we are facing high vibration in a screw compressor over a period of time which is situated in 660MW thermal power plant.the vibration in compressor is 22mm/s RMS on 25 of jan. then we cleared the air fillter & oil filter also but vibration is still high.After these action the vibration is now 19mm/s RMS. i attached the various spectrum & trend also. No other useful information i have.
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high vibration in motor side

vishal sharma ·
sir we are facing  high vibration  at motor side .its a 113 kw motor.sir give ur suggestions  on urgent  basis
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High vibration in partial loads in hydraulic turbine

Harold Pacheco ·
Hi guys   I have 02 new same francis turbines with following characteristics: - Max Power 59 MW - Speed 360 rpm - Bearings: 01 guide bearing for turbine, 01 lower guide bearing for generator and 01 upper combiner bearing (guide and...
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High Vibration in Roller Press Motor

vidya Sagar ·
Hi Friends,                  In our plant we use roller press for cement grinding and in one of the roller press we observed very high vibration in motor of both rollers i.e., fixed and movable.So we...
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High vibration on 356 HP Motor- 742 RPM Vertical Pump- Sea Water Duty

vipul@cmc ·
Hi , We are facing High Vibration on 356 HP Motor- 742 RPM Vertical Pump- Sea Water Duty Kindly find the attached sheet with all details - Kindly give what could be the possible reasons for high Vibrations. Regards,
Topic

high vibration on a centrifugal fan loosed bearing

alainraad ·
how can i change the natural frequencies of a centrifugal fan other then adding weights?
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High Vibration peak at 110Hz

Avinash Thawani ·
I am getting a high vibration peak at 110 Hz and it is there in the pump. The pump speed is 68Hz. This is a horizontal pump with a gear box between the motor and pump. Kindly advise what is the cause.
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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 radial fluctuating vibration ..especially in fluid coupling

subh ·
Greeting to all I am working in a green field project. I have number of belt conveyor. Sequence is like motor + fluid coupling + gearbox + geared coupling + pulley. While taking the vibration, in coupled or no load condition , i experienced...
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High Vibration

BoilingCrude ·
Hello, We installed a rebuilt electric motor and performed a solo run test after it had found it's mag center. We had a report of .1 IPS is threshold of acceptable this measures .235 IPS of 1 x unacceptable. The bolting was is tight to the motor and foundation to grout, We then pulled together the group went out and retested our reading were acceptable good condition. Could rotor sag caused the first bad reading? Unit has proximity probes we will tie equipment into them for further...
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high absolute vibration in critical speed in a gas turbine

m-afshar ·
Hello all dears, A gas turbine having few problems has been shut down for about 4 years in an industrial plant. Now, after maintenance of the gas turbine and replacing of the turbine shaft  and running it, the absolute vibration of journal...
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High Electrical/ RBPF vibration

csmclellan ·
Looking for some help. We have a 300HP Siemens motor 4160V that we recently rewind from a 2 speed (900/600 rpm) to a single (600 rpm) speed. I'm getting ODE axial 0.475 in/s at 7200, ODE Horizontal I'm seeing 1xRBPF 0.218in/s with sidebands of 2xFL, ODE Vertical 0.529 at 7200 with multiply following and on the DE Horizontal i have 0.063in/s at 7200 with sidebands of running speed. i have checked with our PdMA tester and came back with no issues. Vibration spectrums
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Head scratching high axial vibration

Chris184 ·
I had a high axial vibration in a 1000hp 4 pole 2300VAC motor. It had some issues with the bearing housings and after they were reworked in the machine shop a second time and a rub cured there still remains a puzzling high axial vibration that is at...
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If you do not know what benefits you are getting from a program...

Reliability ·
If you are currently running a vibration monitoring program in-house or outsourcing it to a consultant, before you potentially throw any more money in the toilet, you really need to audit your vibration monitoring program and ask yourself if you are...
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How to set Magnetic Center of the motor

Engr Jamil ·
We are having one motor for maintenance 3600HP, 6.6KV, 3582RPM. In Solo testing it shows the axial movement of the rotor shaft around 1.3mm back and forth which must be stable in the magnetic center line. We are facing axial vibration 5.5mm/sec and radial around 3mm/sec. The vibration is fluctuating form 1.7 to 3 radial and 2.7 to 5.5 axial. How can we adjust the magnetic center to keep the rotor stable. Also what is the acceptable unbalance for power source because we are having almost 10%...
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KPI's for Vibe program

Alan F ·
What are your favorite KPI's for determining the ROI or efficacy  of your vibration program? If you are a consultant, what KPI's do you provide to your clients? How do you measure the technical accuracy of the program and how do you measure the financial benefits of the program?   
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Kurtosis

Avinash Thawani ·
Is Kurtosis required for Vibration Analysis these days and how significant it is? Which are the main machine components where it can be used?
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Material Coating on fan impeller blades causes high vibration

Saif Khan ·
We are facing fine material coating on the impeller blades of system fan in Cement Grinding area. Can any one guide me about the reason of it and can suggest the solution?
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Looking for pick-up to pc vibration analyzers

edisonindia ·
Something like this http://www.sequoia.it/en/fast_tracer.htm . Any one has any idea about their type of pick-ups to pc analyzers? I have serious doubts about the foot print of their sensor given that it is rectangular with a curvature. Will they fit in all types of motor surfaces ?  I prefer a small round and flat seating surface for a pick-up. Is any one else reliable who are making these types of connect directly to pc sensors (without having go through a box aka vibration analyzer)?
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limit of vibration in 12.5MV turbo generator

chemical ·
any one can explain me vibration limit in turbo generator of 12.5 MV ,in offline measurement in mm/s
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NDE generator of ge frame 6 high 1x vibration

aziz58 ·
dear all i face to high vibration near alarm limit at 1x at NDE side of generator that coupled to gear box of ge gas turbine frame 6 driver. DE side of generator is ok. my question is about the difference phase between x and y sensor located at NDE IS 170 dgree.a magnitude x is near two times  y direction. can i say we have unbalance defect .orbit shape is elliptical . can you show me standard or text book that mention difference  phase at one bearing must be 90 degree when we...
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Odd vibration from gearbox

tcvib ·
Have an odd scenario from a reducer,  We have a 151 Hz peak that resembles gearmesh freq.  but gearbox rebuild shop information does not match for that frequency.  gear teeth counts are not conflicting.  Curious if anyone has seen this before.  gearbox is a double reduction, parallel shafts,  1192 input speed, teeth counts are 25 on HS pinion,  Int shaft has 46 teeth on the bull and 20 on the pinion,  Output shaft has 103 teeth.  This is from the...
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Online Vibration Monitoring

Scottie ·
I am entertaining the idea of going to a full continuous online vibration monitoring system. I currently have some accelerometers installed in the field that are cabled out to a multichannel box where I can pull single axis...
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Please help me What causes this vibration.

*NASER* ·
Hello friends, In a cement factory, a fan, when the damper is closed, the vibrations it is normal. In all three directions. But when the damper is opened, the vibrations are too high and is about 20 mm/s, especially in the axial direction. What causes...
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Orientation to select a brand Vibration Analyzer and Industrial Videoscope

David Cifuentes ·
Dear AMP Users, My name is David Cifuentes, I'm a Venezuelan engineer currently providing my services in Ecuador as a Technical and Commercial Manager for the company GAS TURBINES SERVICES DEL ECUADOR SA TURBIECSA, that is part of the Company Energy Control S.A. I have more than 6 years experience in the Monitoring Diagnostic/Mechanical Vibration field and Boroscope Inspection, however, for different reasons I have always used GE products for Vibration analysis and GE and Olympus Products...
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Radial high vibration

Abu ehan ·
Dear experts, Please clear my doubt; If any disturbance in rotor dynamics, the vibration reading should reflects both sides of the eddy probe(X,Y) as gap voltage varies, this is what I understand. In some cases, why we experienced high vibration from...
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Rotary Screw Compressor Vibration

Jaxn14 ·
All,   I came across a compressor where the vibration of 1/2 lobes meshing frequency amplitude increased. Looking at the trend, the 1/2 lobes peak started to appear since the Aug reading. What is this indicating?   This is oil flooded SSR...
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