Tagged With "Bearings"

Audio

Bearing Lube Example II

UEsystems(SC) ·
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...
Topic

Abnormal Tilting pad Bearing Wear & Partial Arc Forces

FSX ·
Dear ALL I posted this problem earlier but that thread went into units discussion. My apology in advance for inappropriate units if any. Currently we are facing problem of frequent bearing failure on HP Steam Turbine used to drive Synthesis Gas Centrifugal Compressor train. Below are the details of this turbine   Make:                   NuovoPignone Type:                  ...
Topic

AHU Bearings

USMC 08 ·
I have a number of AHU's that I cannot enter due to site policy.  When the techs go around to lube the motor and fan bearings at the external zerk fittings, I need to give them some indication that enough grease has reached the bearing. ...
Topic

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?
Topic

Anyone using Ultrasound on slow speed apron feeder bearings?

gregsm33 ·
Just looking for anybody using US on apron feeder bearings.I just took some baseline readings today.   My question is this:   Will the sprocket and chain/flight noise interfere with the signal or sound? Bearings are about 1 RPM and the...
Topic

Acceptable bearing frequencies

tcvib ·
All, Have a question for the group.  How much vibration, at bearing frequencies, is acceptable in a reconditioned motor?  Have a reconditioned motor  that is indicating loooow (.004 in/sec Pk)amplitude vibration at inner race bearing...
Topic

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
Topic

bearing fault frequency database

Bill Kilbey ·
Is there a source for this? Spreadsheet or DB? I could export CSI's , but I would rather get one legitimately, if possible.
Topic

Bearing fault severity

Sine wave ·
Hi Guys,attached are the data on a sump pump which has been showing a bearing fault for a while and the latest survey indicating an increase of severity. I am relatively new in vibration analysis and first timeI've been given the opportunity to...
Topic

BPFO at Roller Bearing

vidya Sagar ·
Hi Friends, I am observing BPFO at Roller bearing in Shock pulse spectrum in roller press with 22.5 RPM.But in velocity and acceleration spectrum it is not that visible.Bearing number is KRW 12.70.01.Should i change the bearing as we are facing frequent failures of brg???Please find the spectrum's for reference. Thanks in advance.
Topic

BALL BEARING FAILURE ON 1,3 MW / 6KV SCHORCH MOTOR IN REFINERY

George NV ·
Preventive - predictive maintenance team has called for withdraw and repair large electric motor , vertical , 1,3 MW , 6 KV , 745 rpm driving large multistage pump . Finding was DE bearing wear  ( inner ring ) . That was confirmed upon disassembly and inspection .  Strange finding is the wear pattern found on the outer race of the angular contact ball bearing , 7330 B , mounted inboard on top side . This bearing only for axial loading . Next to it , outboard is a 6330 C3 brg . This...
Topic

Bearing temperature swings

Missisquoi ·
I operate a small (220 kW) hydroelectric plant. It has a vertical axis Francis runner that hangs on an assembly containing a radial and a thrust bearing around a 6" shaft. The radial bearing is an SKF spherical roller bearing and the thrust is a Timken cylindrical roller bearing. This shaft is isolated from the rest of the transmission by a flexible coupling. There is essentially no radial load on it, but 8,000 lb or more of axial. We have a thermistor bolted to the case of this bearing and...
Topic

Bearing wear detection techniques for beginners

Alan F ·
I created this presentation for Mobius about 6 years ago and I recently rediscovered it and posted it on LinkedIN. I got a lot of positive feedback so I thought I would share it here as well. It is intended for people just getting into vibration. It describes how to detect an outer race bearing defect in the time waveform,, the spectrum and using demodulation. It explains the relationship between these three data types. http://www.zencovibrations.com...tion-analysis-video/ En Espanol:...
Topic

Conveyor Tail Pulley Bearing Damage

MarkSl ·
My customer recently removed an NTN 22220KC3 bearing from the tail pulley of a conveyor due to increasing floor noise in the FFT spectrum and impacting in the waveform. We have taken a grease sample from within the rolling elements, cleaned and...
Topic

Electric Motor Bearing Grease - quantity and frequency

TroyS ·
I've calculated a whole bunch of grease quantities and ideal intervals for our electric motors in a plant environment.  To manage the work load we've fixed our routes to 60 days.  This is where my question comes in -  I'm not concerned about adjusting the grease quantity down when the calculation tells me to less often.  Example  - calculation tells me to add 100 grams of grease every 120 days and set our program at 50 grams every 60 days.  Where I get concerned...
Topic

Electric Motor Defect Frequency

Alvaro Loayza ·
I want to share this case that we had 2 weeks ago in our plant. Equipment: 500 hp 1780 RPM Toshiba motor With 6322 Inboard Bearing Fault: BPFI with sidebands at turning speed. Peakvue Amplitud 0.75 G's rms. Report: Scheduled replacement for 30 days. Trend supported recomendation. Results: Maintenance lubricated bearing and amplitud dropped to 0.2 G's RMS. BPFI with sidebands was still present. They replaced motor bearing 45 days later after first report. Visual inspection didn't show any...
Topic

Finish Mill Stand Gearbox

Phil2425 ·
I am seeing 1x impacting in waveform data from a gearbox. We have opened the box up to replace a faulty bearing. We inspected the gearsets and did not find any signs of broken or cracked gear teeth. I know that other stand and other mills have a 1x...
Topic

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   
Topic

High turbo expander load bearing temperature

THANH TU ·
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...
Topic

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...
Topic

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...
Topic

Gearbox Thrust Bearing BPFI due to known high axial load issue and estimation of remaining life of Bearing

Ayaz Ahmed ·
Dear Experts, On 12-Jan-2016 we overhauled a Gear box driving huge axial flow pump (This Pump is the other pump just next to the pump for which I had previously asked a query) through a U-joint coupling. We observed damaged Double Row Spherical Roller Bearing (22232 Bearing installed at free end of Output/ LS shaft @ ~214 rpm) due to High Axial thrust forces on Gear Box from the pump side which is eminent from severe damage on Outer side of Inner row of Spherical rollers. The damage clearly...
Topic

Hissing pump bearing

Dom Agomuo ·
Wrt Sulzer centrifugal pumps. Does anyone know why the  bearings are hissing when we manually rotate the pumps? There is oil in the bottle. Any suggestion what to do to stop this noise?
Topic

Lagging force in bearing

vidya Sagar ·
Hi,     What is lagging force in a bearing.I received a report stating that there is Lagging force coming out from inner race of bearing because of which there is change in the RPM.Thanks in advance.   Regards Sagar
Topic

Large Bearing Fault Frequencies

Costa Ilic ·
Hello to all, I am wondering if you could help in determine large bearing fault frequencies. It is possible to find it online is what detail dimensions of them are in order to estimate it. I am interested in those bearings:  FAG 564647 Split Bearing (700/460 x 245)  FAG 527466 (1000/1210 x 92)  FAG 527463 (670/820 x 69)  And similar bearing that I do not have number, with dimensions (1360/1120 x 106), should be FAG F-801007.ZL. Where to find information about those...
Topic

Limit of Temperature in Motor Bearing and Motor Body

Jay Paul ·
Limit of Temperature in Motor Bearing and Motor Body   Thanks in Advande
Topic

NDE of sleeve bearings

Lukas1311 ·
Industrial standards do not required any NDE tests that has to be performed on large induction motor sleeve bearings as a part of preventive maintenance activities. In our facility we has performed NDE test (UT and PT) since 2010. We use ISO 4386-1 and ISO 4386-3 standards for acceptance criteria. We chose conservatively class B for our acceptance criteria. In few years we found out that most of our sleeve bearings are out of acceptance criteria. So, I am looking forward to hear industrial...
Topic

Mismatched Bearings & Housings

Rusty Cas ·
*
Topic

Pillow block bearings.

Mgill ·
Any pointers on analyzing pillow block bearings?
Topic

Rollers turning sideways in agitator bearing

tcvib ·
We have had a failure in an agitator bearing that the area reliability engineer said the bearing rollers were turned sideways. The question has been asked if there is a way to pick this fault up? Thinking about this, if the rotating element gets turned in the bearing what type of signature should we expect. Looking at the data I see no indication of a severe condition in the agitator bearing.
Topic

Steam Turbine Inlet End Bearing Vibration

chitrang.nanavati ·
Dear Experts, We have machine train as per attached pdf. On steam Turbine inlet side bearing vibration is on upward trend since last couple of months, still it is far from alarm value but your comments will help me to plan early Spectrum shows predominant 1X and also shows harmonics, we do have existing mis-alignment issue but it is there since last 4 years, but vibration only started increasing since last 2-3 months. In Oct 2015 we inspected this bearing during shutdown and...
Topic

Strange noise in wave file from Apron Feeder Head Pulley Bearing

MarkSl ·
I've been monitoring the head and tail pulley bearings on an Apron Feeder for some time now and in the last two data collections there is a very strange noise heard in one of the head pulley bearings. I have been told by a ultrasonic professional that...
Topic

Temperature Measurement Gun

abonoor ·
I am looking for suitable IS infrared temp measurement gun that can be used for rotation equipment bearing temperature measurement.   could you please help on this?   Best regards abonoor 
Topic

Test Bed Motor and Blower

Avinash Thawani ·
I have motor and blower currently the noise is 100 db.I want to reduce the noise, can you please advise how to remove the noise. Please find picture attached.
Topic

Types of bearing sound for prediction

Mrunal Dave ·
Dear Vib Legends, After a long interval of working in pure maintenance profile (2 years) again I am shifted in Condition monitoring cell. I am trying to recall my key learning of more than 7 years of Condition monitoring and NDT. Can anyone please help me from somewhere I can get information about types of bearing sound from which prediction could be done about the possible wear symptoms. This will be a great help to gain the confidence on my analysis comments to improve the equipment...
Topic

Turbine bearing vibration

Irhazidi ·
Hey all,   I am now troubleshooting on RR Allison 501-KB7 (Gas Turbine Generator Set) package after new engine change-out.   When unit successfully start-up with no load and in stable at @242.81Hz/14570 RPM, vibration high at #3 bearing...
Topic

Water pump bearing high temperature

zhouyh ·
Hi, Nice move. A injection water pump NDE bearing temperature is high, causing frequently failure. Please see the attachment, I would be very appreciated if you put in any comments.
Event

Solutions 2.0 Virtual Conference

Reply

Re: Mismatched Bearings & Housings

OLI ·
I have lately had a couple of cases where not even buying a set is a guarantee that it works, brand new from a 3-letter supplier common around here. Production plant is an hour drive from here. Still cast housing was measurable not in spec... It gave similar indication. Plant sent them in for warranty claim, unknown result... If the rings are the axial locking ones I seen all combinations including like everywhere in both bearings and that is not good. Olov
Reply

Re: Mismatched Bearings & Housings

dog ·
Rusty, I have seen this before also. It got to the point at last job we checked housings before every install even if Housings and bearings were same make. I have never seen 2 locking rings in same bearing. Noticed this fan is running in grease. I could be wrong but speed seems high for grease. I'm new on board so don't beat me up to bad.
Reply

Re: Mismatched Bearings & Housings

Dan Timberlake ·
Hi Rusty, What type of bearing, size and number? This SKF cross section seems to indicate a "locating ring" on each side. http://www.skf.com/binary/21-1...EN_tcm_12-151607.png Assuming the main features like centerline height etc, are right, I'd consider using another housing if the housing bore measured reasonably close to having the proper fit. Actually it is probably best to check ANY pillow block housing before use. When Lacking inside and outside micrometers Plastigage is a decent...
Reply

Re: Mismatched Bearings & Housings

Steve Ciesla ·
Theoretically, a mixed housing and bearing set should work, IF the fit matches your expectations. Specifying an ISO fit (after an issue or two with a specific installation), typically falls into a "gray" area. It would be interesting to know what the bearing housing manufacturers are using for their default fits. Buying a "set" does not guarantee that the fit matches your expectations, but it is probably better than grabbing a random housing and bearing of the shelf. This is definitely one...
Reply

Re: Conveyor Tail Pulley Bearing Damage

Edwin de B ·
Wear on one side must be caused by axial load. The brinelling is caused by the abrassive material in the grease.
Reply

Re: Conveyor Tail Pulley Bearing Damage

MarkSl ·
Originally Posted by Edwin de B: Wear on one side must be caused by axial load. The brinelling is caused by the abrassive material in the grease. Hi Edwin, Don't you mean that the brinelling on one side of the bearing is caused by an axial load - I thought this as well, BUT what would cause axial impacting on a conveyor pulley. This conveyor is an incline built inside a shed and there is a walkway either side of the conveyor so there is nothing that could cause an axial impact to explain the...
Reply

Re: Conveyor Tail Pulley Bearing Damage

Beatnik ·
Conveyor misalignement maybe? If the conveyor is displaced on one side of the pulley it seems logical that it will push axially on the pulley.
Reply

Re: Conveyor Tail Pulley Bearing Damage

Nockingroll ·
belt tracking?
Reply

Re: Conveyor Tail Pulley Bearing Damage

Dave Reynolds ·
2 cents....one side of the bearing is in contact the other side is not possibly caused by cocked bearing on the bearing support, shaft or in the housing. In order for the second set of rollers to rotate while at rest means one side of the bearing is carrying the load. Another possibility is the axial position of the bearing is "preloaded" causing one side of rollers to be engaged and other set to be loose. I noticed in one of the images the brinelling lines go into the grease path/middle of...
Reply

Re: Conveyor Tail Pulley Bearing Damage

Edwin de B ·
And maybe it is just a slight axial load. Nothing wrong with it, but it results in (more) wear at one side. The race at the other side also shows wear but a lot less. I think the problem to focus on is abrassive material getting in. And that will be a hard one in the environment this conveyor is in I suppose.
×
×
×
×