Tagged With "High"
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6000 v elecric motor high vibration
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
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
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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Boiler feed pump high vibration at discharge pipes than pump and motor
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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Conveyor Gearbox high axial vibration
Hi every one iam having problem in Gearbox high axial vibration (High speed I/p shaft) Conveyor for coal handling in Thermal power station maintaining high axial vibration: (H: 4.0mm/sec V: ...
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Cooling Tower Fan High Motor Vibration
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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GT SGT600 PT bearings 3 & 4 High Vibration
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
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
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
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 pump
Dear all would you please tell me what is the main reason of increasing vibration only in radical direction..
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High vibration on 356 HP Motor- 742 RPM Vertical Pump- Sea Water Duty
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,
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High Vibration peak at 110Hz
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 gear pump vibration
Hello to everybody, We have 6 ball mills in a cupper concentrator plant. These mills suport over two pad bearings (fixed and floating) that are lubricated with high pressure oil. Every mill has a lubrication room with two oil modules, one for each pad and works with high pressure Rickemeir gear pumps. Our problem is that almost all of these high pressure pumps have a very high level of vibration in some cases they reach 54 mm/s at GMF of pump gears. Do you suspect which could be the source...
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High horizontal vibration on gearbox
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 pressure gear pump vibration problem solved
Hello everybody, A few days ago i posted a topic about a problem we had in our high pressure gear pumps. Here is the original post: http://www.maintenance.org/topic/high-gear-pump-vibration I want to share with you the way that we solved this high vibration problem. After checking pad oil piping at discharge in both fixed and floating mill bearings, we noticed that high vibration was still significant and even higher on hosepipes that were connected in every pump discharge connection. So I...
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High Rms @ x1 Axial
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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High turbo expander load bearing temperature
Dear all, I just finished overhauling the Atlas Copco Rotoflow turbo expander and now it has an issue that needs troubleshooting. I would deeply appreciate if someone can help me to troubleshoot this problem The problem is as follows: The load (compressor side) bearing temp is 73 C @ 23,730 RPM and it will increase when RPM increases. If the RPM reaches around 25 000, the load bearing temp will go up to 78 C which is over the alarm limit_75 C. When I did the overhaul, all clearances...
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High Vibration
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
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 axial vibration at 18x in a flowserve pump electric motor.
Hello, I have 10 identical flowserve water pumps. They are driven by a 1620 HP ABB electric motor. In 9 of these pumps I have very low amplitudes of vibration in every direction at electric motor. (0.3 -- 0.5 mm/s) I supposed this is because of system stifness But in one of them, specifically in axial direction I have very high levels of vibration (7.1 mm/s at exactly 18x) This shafts turns at 1180 RPM. So frequency is aproximately 21200 CPM. This vibration is higher (7.1 mm/s) as close to...
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High Electrical/ RBPF vibration
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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High Frequency Haystack - is this lack of lubrication
Hi I collected data from a 2 week old vertical mixer which is noisy and sounds like a dry bearing. The motor uses sealed bearings so they cannot be lubricated. The high frequency vibration data shows a haystack between 2KHz and 2.5Khz primarily...
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NDE generator of ge frame 6 high 1x vibration
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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seal air fan (Radial Fan) Axial Vibration
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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High 2660 CPM vibration at variable speed 4 pole electric motor
Hello, We have 6 sulzer centrifugal pumps that are driven by a 3250 HP, 1785 RPM nidec electric motor each one. The electric motor has a VFD and it operates only between 87% and 97%. The strange situation is that the motor has high level of vibration coupled and uncoupled at a 2660-2670 CPM frequency. I suspect that the problem comes from the electric motor and not from the pump because of the uncoupled test that was made. Attached you can see the spectra that was taken. If you have an idea...
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Multi stage Pump High Vibration
Following are the vibration values of pump DE and NDE : DE - Horizontal = 10.84 mm/s DE - Vertical = 3.5 mm/s NDE - Horizontal = 11.5 mm/s NDE - Vertical = 3.3 mm/s Axial readings are less than 1 mm/s. All peaks are at 1X of running speed as shown in attachment. What may be the main problem?
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continous high vibration on pump drive and non drive
i just want to clarify my doubt.a pump having 20gE and 27gE at drive and nondrive.velocity was below 1.5mm/s.recently operations were informed they were not getting exact flow.so they removed stainer and cleaned it.they found wastage.after that it was in standby mode.what type of experiments i can do in futurefor same issues.please share ur knowledge.
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high vibration
i am posting two pumps running condition.pump A having 3H 5mm/s and 3HE vibration.pump B having only envlope readings were high.i know there is flow issue for pump B.but i have doubt with pump A.even i checked coupling shims for pump A shims were fine.please share ur knowledge. two pumps running condition at a time. please help me i havebeen facing problem with two pumps running condition to analyze.this is a third time repeating problem for me. thanks in advance
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Examples Of High frequency vibrations?
Is there any example of high frequency vibrations more than 40Khz.(with calculation please.) . i need at-least 2 or 3 examples.
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High Vibration at 2X
Respected Sir/Friends; Good day. I am working in Oil and Gas field. Here we have Centaur 4702 Two shaft gas turbine from Solar Inc. The technical data of the turbine is as under: Axial compressor 11 stage Gas producer (GP) 100% RPM is 15000 Power turbine (PT) 100% RPM 15500 At Gas producer we face a very difficult problem which is as under; When we start the turbine its vibration is within limit and turbine stays on its idle speed that is 72% very smoothly. Now we increased the speed at a...
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High bearing Wear Particles in a new bearing
Hi friends, Recently we changed three roller bearings of roller press with new one and after one month running we analysed the grease sample of all bearings.Surprisingly all three new bearings were stated in critical condition with bearing wear particle around 700 microns.Re sampling of grease of three bearings was done and the result was same.But we are not finding any defects in the spectrum. What could be reason for high bearing wear particle in a new bearing ? Thanks in advance. Regards ...
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High temperature transducers for GT sets
Undertaking a vibration survey/'in-situ' balancing exercise on a GT13E2 (Alstom, single shaft!!) and would like some answers, if possible: 1) what is the high temperature transducer of choice for the hot end and its attachment (stud, glue,)? 2) I assume standard magnet mounted velomitor transducers for the cold end? 3) Generally, how many measurement vibration planes (i.e. GT brg configuration)? 4) How many accessible balance planes? 5) I assume there is an exposed shaft area for speed/phase...
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High Motor Amps Fluctuation in ACC Fans
Dear Friends, what is the major reason for high amps fluctuation in Motor Fluctuation around 60 to 80 amps other fans are less than 10 amps. Motor kw -160 Norma Motor amps readings - 150 To 160 ( Fluctuation between 10 amps) Problematic Motor Amps readings - 120 To 200 ( Fluctuation 80 amps). The fluctuation due to Mechanical reasons or electrical issues? Gear box & Motor vibration readings are within the limits. please share your ideas for cause of High fluctuations. Thanks &...
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High speed balance question
Hello everybody 1. when do we need high speed balance exactly in industry? 2. is it possible a balanced rotor in 40000 rpm (above second critical speed), show unbalance in 3000 rpm balance machine?
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High vibration at vibrating screen drive system
Hello to everybody, I have been taking vibration data from 12 vibrating screens drive systems for a year. In three of them we have had severe vibration increments from 4 to 6 mm/s to 20-30 mm/s in horizontal and from 3 to 4 mm/s to 8-9mm/s in axial direction Spectrum shows 1x from screen frequency (842 CPM) and phase shows like unbalance. SCREEN 401 TREND AND SPECTRUM M2H We suggested Maintenance people to inspect the cardan coupling and vibration later was lower in axial direction but still...
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high 1x SGT600 casing vibration
Dear all I face with problem high 1x casing vibration on SGT 600 gas turbine Amplitude vibration during starting up to 8500 is under 1 mm/s .after bleed valve start to close , vibration suddenly increase up to16 mmm/s .so gas turbine trip. I should be mention that nominal speed is about 9400. At this model of gas turbine we don’t have proximity sensor to monitor relative shaft vibration. Only on for axial movement exist. For bearing vibration monitoring we have two accelerometer on the face...
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High vibration in Fan Non DE bearing Horizontal direction
Hello friends We are facing new problem in ventilation fan ... Vibration is high in horizontal direction in each measuring point, and dominant in 3x RPM. Major problem in Fan NDE BEARING ....In all directions (H,V,A).... I attached all data .... What is the reason of this problem???
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Gas Centrifugal Compressor - High Temperature LP/IP Thrust Bearing Outboard
Hi All I'm operating the 3 stage centrifugal compressor and facing with the problem of LP/IP Compressor Thrust Bearing Outboard Temperature raising to 105 deg. I did try to do the re-alignment to check and confirm the pre-stress value is ok within limit but the Bearing temp were not reduce. Would you pls give me something to trouble shoot in this case. Thank a lot Cuong
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High 25x in Hydraulic piston pump
Hello All, We were seeing high 25x on our turbine hydraulic piston pump, see attached spectrum. Since the vibration was high and the system pressure was swinging we went ahead and changed the pump. Teardown and inspection reveal nothing significant. Was wondering where that 25x might be coming from? Anybody here dealt with piston pumps or similar situation? Thanks
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High vibraiton on Genrator during No-Load
I collected vibration data during startup Gas turbine Generator , Speed 1800 rpm. High vibration alarm at 0.15 IPS rms, dominant peak is 1x rpm (30 Hz) during No-load test at NDE VT side, DE VT side reading at 0.05 IPS. Vibration NDE VT reduce to 0.05 when test on load. Please help me, why vibration high during No-load and drop when put on-load.
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high vibration at gearbox and motor only in one rolling section
Hi i am attaching one document please go through.. High vibration is observed at 25mm rolling section only same Equipment doesnt have vibration in 12mm, 16mm, 20mm, 32mm, 40mm rolling.. A peak is observed at less than 1x rpm which is domianant in this section.. Suggest me some solution
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High vibration on centrifugal pump
Dear expertise, I need your suggestion, I have a case and need your advise. I have centrifugal pump 2975 rpm, 520 kW. In april 2017, i have a dominant spectrum in 1x and 3x, 1x = 0.673 mm/s, 3x = 1.162 mm/s. But suddenly when I throttled the valve on 10% opened, the spectrum becomes 1x = 0.334 and 3x = 5.116 mm/s. Found harmonic 1x motor speed. Firstly I thought that is the effect from cavitation. But i didn't see any raised floor on high frequency. Note : this pump using sleeve bearing on...
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High 1X Axial Overhung Fan
Hello friends! It is a combustion air blower of a boiler with 1X of 1784 cpm. The values of 1X radial direction with 4 mm/seg-rms in ODE and 6 mm/seg-rms in DE, but in the axial sense the 1X is 17 mm/seg-rms. There are no harmonics or BPF present in the graphics. What could be producing this high 1X in axial? Further information is needed and can be supplied. Thank you for your valuable comments. Regards, Raul Rios
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Chiller Pump 1-A
Dear all Here with I attached spectrum file of chiller pump-1-A May month pump was running good and vibration was normal but yesterday take vibration vibration was very high so kindly any body suggest me what is the problem on pump .
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High Floor Noise On Cold Rolling Mill DC Motor (1400 kW)
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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45000 dwt Chemical tanker Diesel Generator 4 high vibration on Alternator bearing
Greetings team, on 8th July I attended another Chemical tanker and DG no4 alternator bearing Horizontal overall vibration showing 23.4 mm/s in velocity scale. The Marine classification society satisfactory limit is 18 mm/s. Attached the engine and Alternator end vibration spectrum FFT in velocity. All engine details are available in photo sheet. Appreciate your feedback. Kind regards Chary TSR
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high 2x pump vibration
dear all i am dealing with high vibration at 2x on high pressure multi stage centrifugal pump. High amplitude is at horizontal direction more than others and the value not constant at each measurement .1x &2x appears with low value .alignment is ok. I suspect to cock bearing but I don’t have any phase cross shift around bearing. Vibration value for electromotor is normal. Machine speed is 3000 rpm and DE bearing is deep groove, NDE bearing is angular contact. Any help will be...
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High vibrations in no-break MG set
This is a 1500 RPM, 50 Hz no-break MG set with an diesel engine, flywheel with clutch, an ac motor and a dc generator. The whole train is mounted on AVM pads on a common concrete base as shown. With the engine disengaged and only the ac motor driving the flywheel and the DC generator, the vibrations are consistently high in the region of 5 to 10 mm/sec rms. I have enclosed the overall vibration levels (over a 3-week period) and the spectrum for each bearing of the flywheel, the ac motor and...
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High current and high vibration of Vertical Turbine Pump
The Six Stage Vertical Turbine Pump is being used to deliver service water from the sump to the chiller of the hybrid cooling system of the hydro generating unit and for the ventilation system. It is being run by induction motor of synchronous speed of 1500 RPM and rated capacity of 125 kW. Recently, it has been tripping frequently due to overloading (drawing of high current up to 240 Amps which is very high as compared to what it used to draw earlier which was between 160 to 180 Amps. The...
