Tagged With "axial"

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Another Resonance Question

Mile High_PumpFE ·
Have another resonance question..... the is the AXIAL plane of a thrust end bearing housing. Please see the attached document that shows a vibration trend with 3 data collection points - please pay attention to the 2x peak as speed increases through the test point. You can see how it is moving closer to resonance. Also please notice the vane pass peak at 198.25 Hz as the pump increases in speed. There is a resonant like response at the highest speed (black line). If you look at that spectrum...
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Compressor have abnormal behavior of axial movement

Unplugged.Charles ·
Hi everyone! I'm suffered with one centrifugal compressor which have abnormal behavior of axial movement. Rotor axial position is moving to inactive side gradually. I would like to hear your opinion for overhaul work. This compressor is overhung type and driven by motor (3746rpm). And this machine is compressing cycled gas from 10.9 PSIA to 18.3 PSIA. Last overhaul work 2015, thrust end play was lager than allowable value(0.33 ~0.406 mm ). So adjusting plate thickness was changed and end...
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High 1X Axial Overhung Fan

Raul Rios ·
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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Balancing of fan

vishal sharma ·
Dear all i am dealing with a RAW mill simple supported system fan 2500 kw motor with 990 r.p.m . The spectrum in DE bearing showing 1X with an amplitude 3.8mm/s overall vibration is 4mm/s in DE bearing in horizontal direction. vertical: 1.2 mm/s Axial: 1.4 mm/s but at NON DE side bearing we are having 5mm/s overall vibration in horizontal direction. the spectrum in NDE bearing showing 1X with an amplitude 3.9mm/s . vertical vibration is :1.8mm/s Axial: 2.4 mm/s by doing time wave form...
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HIGH AXIAL VIBRATION

vishal sharma ·
Hello guys please help me to solve this critical problem. please go through the attached file. High vibration in Preheater Fan Case: During our monthly scheduling we are continuously observing high axial vibration in preheater ID fan at DE end. Radial vibration is under 1mm/s or 1.2mm/s. Description: 1-Fan R.P.M-900 Motor K.w-1500kw Vibration in motor: NDE H: 0.8MM/S V:0.6 MM/S A-0.4MM/S DE H: 0.4 MM/S V: 0.9 MM/S A: 1.1MM/S Vibration in Fan: DE H: 1.1 MM/S V: 1.5 MM/S A: 5.1MM/S NDE H:...
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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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High Axial Vibration in Gearbox

Soumya Mishra ·
Dear Sirs I need help regarding high axial vibration in gear box of a blower. I have attached all the details. If any further data required kindly reply. High vibration observed after replacement of impeller. No maintenance was carried out on the motor-GB side.
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Axiall movement

aziz58 ·
Dear all What courses of high axial movement at gas turbine? I face to axial displacement alarm limit of Siemens Sgt 600gas turbine. They have six sets of gas turbine which only one of them have high axial movement. All operation conditions and process were the same. Pls, share your opinion. Best regards
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Gearbox between a steam turbine and generator.

Sarah M ·
Good afternoon everyone, I am back in search of guidance and wisdom, ok I need help. My senior is out for a week and I am left to my own experience. I took readings on a turbo generator yesterday that had me concerned last month with high axial vibration on the outboard sleeve bearing of the input shaft. These readings are from a magnet mounted accelerometer which is not optimal for a sleeve bearing application but is used for condition monitoring. Last month the readings came out to 11G's...
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High axial vibration

aziz58 ·
Dear expert I faced too high axial vibration at free run electro motor after change the bearing. (6 mm/s)overall vibration The bearing is deep grove 6318. FFT spectrums show 1x, 2x. I have done phase analysis as following the result The phase between (V1and V 2 ) was 180 The phase between (V1and H1)was 180. The axial phase between DE and NDE was zero. We have removed fan cover of the motor end; after that axial drop to 3 mm/s. Pls, share your opinion. Best regards.
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High vibrations on Alternator NDE

Chetan Patil ·
Hello Team, Once again I am coming here with similar kind of machine and vibration problem. EMD engine with an Alternator (with single bearing at NDE) RPM : 900 RPM Alternator: 600V, 2525KVA, 1400kw, 60 HZ Engine vibrations are within range (around 8-9 mm/s) Alternator NDE is vibrating with High vertical (24 mm/s , purely 1X) & Axial (16 mm/s with 1X = 8.6, max peak 12 mm/s @7182 cpm and minor 2X,3X, 4X) vibrations. (due connectivity issue at offshore I counldn't upload the spectrum...
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High VPF Axial Vibration on the Vertical pump

Vibration Analyst2811 ·
Dears, we face the problem of the vertical pump which has VPF axially and the horizontal and the vertical are normal.However, during the coast down peak hold the overall reach to 6.4mm\s and the highest peak is VPF reach to 3.7mm\s FY advise... regards,
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High axial displacements of BFW pump.

Vastocean ·
Hi experts, We are having a trouble of high axial displacement of BFW pump which is driven by a steam turbine, hope receive your solutions. The axial displacements of pump increase time by time and the overall vibration of both sides also go up as well. The problem is the thrust bearing active side’s temperature is stable but the right pad’s temperature is higher the left pad’s temperature. But the other one is driven by a motor; we do not have any issues. I am confused about the root cause...
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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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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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Diesel Generators Engine side Axial vibration High on a 17000 DWT Chemical Tanker vessel

chary tatta ·
Dear AMP team, This case is about 2 diesel generators (DG) Engine free end Axial vibration found high. Attached is the DG vibrations recorded on Alternator end- Satisfactory, Engine end Axial vibration High. Attached the vibration velocity FFT spectrum, further any other files required like time wave form, Acceleration FFT and time wave forms shall be posted. Engine rpm is 900. Generator appearance in images for your kind understanding. Appreciate your participation on this case study.
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What to do with this Axial Piston Pump

Midowahba ·
i have Axial piston pump ( 9 pistons and swash plate - variable displacement Model PV 270 R1K 1T 1N FWS) connected with a motor running at 1490 rpm , i dont have much experience about how to evaluate the accepted limits of vibration in these types of pumps and what is the best way analyse its spectrum. BUT i have a serious vibration can be sensed by your hand on the motor and the pump , i dont know if the main cause is due to the fixation of other reasons .. i attached the spectra .. i need...
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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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Motor running in offset from magnetic center

Abhi03 ·
Dear All, We have facing a issue with one HT motor with axial fan load. When we start the motor (consider the motor has stopped in offset from magnetic center) it continues to run in offset up to rated speed (996 RPM) condition without trying to attend magnetic center. However when we reduce the speed bellow 500 RPM it comes to magnetic center and continues to run at magnetic center. The motor is designed with floating bearing and load DE side bearing is axial guide bearing. The motor rotor...
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Axial End play limits for motor provided with ball bearings

vikramdeeps ·
Hi Guys, Can you help me with Axial End play limits for motors provided with ball bearings.Any standard which says the limits for end play for motors?
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Vibration Tri Axial Sensor Mounting

Avinash Thawani ·
Hi, What are the pros and cons of RAT vs VAH scheme RAT is Radial Axial Tangential VAH Vertical Axial Horizontal Which one is better for Triaxial
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GE frame 5 MS5001P Load Gear Quill Shaft Axial Movement

FSX ·
Hi every one We have a GE frame 5 Gas Turbine MS5001P coupled to Generator through reduction gear. Reduction gear is double helical. Pinion is coupled to turbine through gear type load coupling. Bull Gear shaft is hollow and a quill shaft is inserted in it. Generator Rotor is coupled to bull gear using quill shaft. Quill shaft has integral flange at generator end which is bolted to generator rotor flange. At the other end quill shaft has splines on outer dia and a hub with splines at inner...
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High axial vibration at 18x in a flowserve pump electric motor.

Alvaro Loayza ·
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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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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High Vibration at 2X

JCP420 ·
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 4x T.S. amplitude in a timken bearing

stevenlee ·
I am having trouble figuring out what this high amplitude 4 x t.s. in the axial plane is from. I have had this problem with Timken bearings before always in the axial plane sometimes it is very high in amplitude. Could it be from the housings or the...
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Motor shaft axial movement solo run

vikramdeeps ·
Hi Guys , Usually I have seen axial movement in motor shaft during solo runs but I am curious to know that How much axial movement is allowed in solo run in motors with sleeve bearings and anti friction bearings?   Guys Usually I have seen...
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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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Overhung fan

azizsuahid ·
Hi guys, happy weekend ") i need some help regarding one critical equipment in our plant. It's an Overhung Fan having high overall and ge. At lower frequency side of the spectrum, i can see running speed harmonics as well as of sub-harmonics of 1/3x , this has occurred after assembly and replacement in March 2016. During the balancing work in march, i found so many weights attached to the fan from previous balancing work, we ignored and continued with balancing(adding another weight) , and...
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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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Balancing duel rotor variable pitch axial fans

John.OGE ·
We are a coal fired power plant and one of our units has large duel rotor variable pitch axial fans for Induced Draft made by Westinghouse. Does anybody know balancing experts (SME) that are familiar with these kind of units?
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High vib. on gas turbine generator NDE bearing at axial direction

chemical ·
Dear all. I am Vivek mechanical engineer. I found this website as I am facing a problem. I have a 105 bar back presser gas turbine    And  12.5 MW -11 kv generator   Here I start from beginning that we done a turbine overhauling...
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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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Axial or Thrust Position Measurement Using Proximity Sensor

Vibrave ·
Can anyone clarify , the axial or thrust position measurement using proximity sensor is AC or DC signal? What is mean AC coupled and DC coupled?
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High Axial vibration

Ayman Gamal ·
Does any body here has experience with high axial vibration on motor installed in vibrating screen (type Techno vibrazioni)
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Girth-gear Runout

Hossam 2 ·
Helloo Experts. is there a method to check the runout of the girthgear (Axial) or radial using non-contact measurement like using dial gauge but using displacement sensor ? and how it works and what is the senstivity or accuracy of the process. Thanks
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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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Noise in the axial piston variable pump REXROTH A10(S)O

ANIS VA ·
Hi, An Axial piston variable pump REXROTH A10 contains 9 pistons driven by electric motor 45 KW, which has a bearing type DE & NDE 6314 ZZ C3, the Running speed is 1488 RPM. we detect an abnormal noise come from the motor, the discharge pressure is floating (the needle the of the pressure indicator is not stable). Knowing that there is adjust pump is working without any issue. As attached, it seems that the cylinder pass frequency (it has to be said) is appeared in the all spectrum in...
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F Class GT Axial Vibration

HertzHurts ·
I have been troubleshooting unusual gas turbine vibration that began following a major outage including new exhaust components and torque tube along with most compressor and turbine blades. Efficiency, compressor ratio, combustion dynamics, power output, and radial vibration are all acceptable, however the shaft oscillates axially at 21.5 Hz. This is a 60 Hz machine. The amplitude is less than 0.2 mils until the engine gets to about 50% power output, then the 21.Hz vibration pops up to about...
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High Axial vibration at BPFO frequency in Simple supported type centrifugal fan.

Vibration_guy ·
Dear All, I'm facing High vibration issue in my FD fan. The attached excel sheel have all the details. Maintenance History- Before PM the vibration of Fan DE was normal, But after PM high axial vibration observed at fan Driving End. I don't have spectrum of that as i was on leave , so my maintenance department decided to change the bearing. But after Bearing change the vibration problem was not resolved. SO they waited for me to come. So when i came i saw that Horizontal vibration levels was...
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Motor axial vibration trend increased

white walker ·
Dear all. Kindly please suggest me for the given below spectrums at motor axial direction 8.2mm/s at MDE&5.2mm/s at MNDE.same spectrum is dominating at all direction.but i will post motor axial direction. machine desing=motor->flywheel>compressor present running load=50% when load reaches to 100% axial vibration trend will reduced upto 3mm/s. Driven equipment is reciprocating compressor with 2stag with four CYl heads Motor RPm=420 KW-630 Pole-14 MNDE axial spectrum MDE axial Thanks...
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Re: Motor shaft axial movement solo run

rgf12 ·
If your motor supplier cannot provide the info I have seen a motor shop tech mark the shaft at rest then run the machine uncoupled and push the shaft with a 2x4 (gently) towards the outboard until it stops to determine total movement. I'm not sure if that is a recommended practice anymore but we were dealing with a 40 year old motor and there was no documentation to be had.
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Re: Motor shaft axial movement solo run

John from PA ·
I have seen three marks on motor shafts and been told they are the magnetic center in the middle position and the total in/out physical movement marks the outer marks. I have also been told that the center represents the "mechanical" center so what they mean in your case may be dependent on the guy marking the shaft. Having said that, in a properly manufactured or rebuilt motor there should not be much difference between magnetic center and mechanical center. Axial forces from being off mag...
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Re: Motor shaft axial movement solo run

vikramdeeps ·
Thanks John but still need some clarification that for motor with off magnetic centre is it necessary to set the magnetic centre in solo run or the motor will sets at magnetic centre by itself in coupled run, And how to set the magnetic centre in solo run?
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Re: Motor shaft axial movement solo run

Chris184 ·
My experience is you first need to run the motor uncoupled to mark the magnetic center. Sometimes you will have a mark at the outermost physical shaft position and the innermost physical shaft position. The center mark is typically the magnetic center. To set mark the magnetic center, you will need to run the motor uncoupled and on a flat surface with any guards or covers installed. If you run with only the bottom half of the end bell or without all the dog house installed, the altered...
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Re: Motor shaft axial movement solo run

Rusty Cas ·
Chris is a motor shop guy, and his explanation sounds right, given what I've seen done in the field. "The trend is your friend" MachineryAnalysis.org
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Re: Motor shaft axial movement solo run

John from PA ·
Originally Posted by Rusty Cas: Chris is a motor shop guy, and his explanation sounds right, given what I've seen done in the field. "The trend is your friend" MachineryAnalysis.org Originally Posted by Chris184: To set mark the magnetic center, you will need to run the motor uncoupled and on a flat surface with any guards or covers installed. If you run with only the bottom half of the end bell or without all the dog house installed, the altered airflow through the rotors fans can cause the...
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Re: Head scratching high axial vibration

Ngo Dinh ·
My question is " do you conduct any maintenance action before the issue happen and if any, how do you align the force center for rotor of the motor?" I focus on the evident that the high axial vibration disappear when the power cut to motor.
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Re: Head scratching high axial vibration

Chris184 ·
Originally Posted by Ngo Dinh: My question is " do you conduct any maintenance action before the issue happen and if any, how do you align the force center for rotor of the motor?" I focus on the evident that the high axial vibration disappear when the power cut to motor. Did you see the bump test at the end of the last page?
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Re: Head scratching high axial vibration

LNG Vibe ·
Chris 184, I think you are on the right track focusing on the BPFO disappearing when power is cut. It would appear to me 2XLF is a forcing frequency of possibly the BPFO or a natural frequency based on your bump test. I have seen modulation in the wave form and high axial like that before on sleeve bearing motors when they are pulled off mag center due to an incorrect coupling gap. Also if the motor is uncoupled and the cooling fan will pull the rotor off mag center. But since this has...
 
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