Tagged With "fan"

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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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“STRANGE” FIRST ORDER (1X) ON FAN SYSTEM

dominich.vo ·
Hi all, I would like to discuss one case in fan system. This is MV wound rotor . Nameplate speed is 16.33 Hz (980 RPM) . However, in spectrum data indicate peak at first order is 15.25 Hz (~915 RPM) . This is so strange with what I learn about...
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Crude Oil Boilers & AQCS

Y7 ·
Greetings,  2 crude oil boilers are used to generate steam and air quality control system AQCS is provided at end of each, the whole system is provided by Macci company. ID fans and FD fans are provided by Boldrochi. The fans encountered several...
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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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Mismatched Bearings & Housings

Rusty Cas ·
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Pillow Block Unusual High Sound

lintu ·
ID Fan Pillow Block has very unusual sound. Grease type roller bearing dodge 22211kc3ah. Any comments for solution?
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Fan vibration

Hossam 2 ·
Hello My question is there any test to check a defective shock abosorber (spring unit) installed below an overhung fan to check is it properly working or not? i have a centrifugal overhung fan with high vertical vibration at 1XTS and when i raise the fan frame with shaft at any shock absorber the vibration decrease at some points and another points increase. i checked the alignment ,bearing clearances,the impeller and what the phase behaviour between horizontal and vertical at overhung fan...
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CT FAN MOTOR VIBRATION PROBLEM

Kishore kumar ·
Dear Members , We have a CT fan at our customer site with high Vibration Problem ,We dont have provision to take vibration data on CT Fan Gear Box ,we do take Vibration data on Motor .Please Verify the below attached data and General arrangement of the equipment and share your opinions. Motor 37 K.W and Bearings D.E 6313 ,N.D.E 6213 C3 clearance running at 1475 R.P.M .
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How to find exact source of Rotor imbalance in centrifugal blowers?

Mayur134 ·
We have overhung centrifugal blowers (Fan: backward curved) equipped in our plant. Centrifugal blowers are with arrangement 4 & 8. Some are of 2900 rpm and other 1450 rpm. I will appreciate your help in following query: Is it possible to determine exact source of imbalance in centrifugal fans. In frequency spectrum analysis how we could find and differentiate the imbalance is due to : 1. Fan unbalance or 2. Motor bearing fit loose in housing or 3. Fan hub loose fit on shaft I will...
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Oval or bend Fans Balancing problems

Kishore kumar ·
Dear Experts , did you ever balance oval or bend fans successfully on site with in the tolerance . i have faced difficulty to balance so many times after repairs done onsite due to bending of fans Base plate and shroud . Yesterday i tried to balance a fan onsite and it did not respond well after i removes the fan pulley belts and balanced statically .After the Vibration reduced from 55 mm/sec to 17 mm/sec .After the fan not respond for balance if additional weight added and vibration...
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Fan Motor Starting Vibration

Hossam 2 ·
Dear all Equipment Centerhung Fan Problem :starting Vibration at motor and fan upon start lasts for 1or two seconds reaches 8 mm./sec sometimes and it doesnt give same behaviour at every start runs between (4 and 8 mm./sec) then after than it damps again to 2 mm./sec the vibration occurs only at start for few seconds and then vanishes. Motor :induction motor 3 MW with LRS (liquid resistance starter). Tests performed : Cascade plot before and during the start to capture the frequency of the...
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ESP Fan Critical Issue

Garry Kristen ·
An ESP Fan of a Cement Plant is badly worn, there found a swear wear and tear on its all 12 vanes same like as you can see in this image. Need your suggestions/opinions to resolve the issue??? Impeller specification are 7684 kg weight , double plane centrifugal fan RPM 745, Diameter 2600 mm. I am gonna decide to rebuild the vanes by Hardox plates having each plate 2 to 3kg, But I am little confused Could it be possible to Balance the Fan after recovering it by too much mass ??
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Fan Vibration

İsmail AYDOGAN ·
Hello everybody. How can improve vibration amplitude? b.regards İsmail
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Placement of vibration sensors for strobic fans

James Karl ·
Good morning- I'm wondering if anyone could give me some feedback on how they are doing vibration analysis on their strobic fans. Of course, you mount the probes as close to the motor bearing as possible. That's easy to do for the motor non drive end bearing, not as easy to do for the motor shaft end bearing (the motor is vertical mount, direct connected to the fan wheel. My installations sit high high above the roof, have no access platforms whatsoever and have never been tested (very poor...
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Cooling tower Fan catastrophic failure

Akhil Rathore ·
Hello everyone Has anyone experienced a breakdown of a cooling tower ID fan where the fan blades (FRP), the drive shaft (metal) are broken in to pieces. where the vibration was very less (monitored by MCT) and 150 Kw driving motor also having less vibration. see the attached pics
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Motor vibrations

PSab ·
Hello, Sorry for my bad English in advance. I have six identical fans. The construction is motor coupling and fan. One of them had huge vibrations on 001V had 38 velocity on 30 Hz frequency and 002V 30 velocity also on 30 Hz the motor speed is around the same frequency so I assume it is motor speed. The vibration is only on vertical axis and vibrations are only on 30 Hz frequency, no harmonics. So I assumed it must be imbalance. We Inspected fan, for broken vanes but only found excessive...
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overhang fan vibration!!!

Ptayebi ·
Dear Experts We have an overhang fan. The vibration of fan change by stop and start the fan. I attached a set of vibration of this fan. please help me!
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ID fan vibration monitoring

olivier W ·
Dear members, I am working on a waste incinerator Unit with à 400000 Nm3/hr flue gas flow. I have an issue regarding ID fan monitoring. We think about a voting system for vibration, a 2oo3 voting. Today we have only a detection on X and on Y on the 2 bearings (common case). The trip is done when one trip value is reached. So it is a 1oo2 trip. For me a 2oo3 is not possible because one detection on X for vibration does not have impact on Y side all the time. The only solution is to have 3...
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High Temperature on Bearing

Garry Kristen ·
Hi, We have a issue on Bag Filter fan Drive Bearing, It has been running on high temperature for last month. Around 100 degree C. It was replaced before three months, After a right quantity of greasing its temperature remains high. I can see there is no High G's Value or early signs of bearing in a peakVue, Infact there is a little resonance ( wobbling ) in one belt. Bearing BPFO Peaks are not matching a little difference with matched lines, there is not high temperature on pulleys or shaft.
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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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3x-8x Vibration Trend Abnormal

Vibration Analyst2811 ·
Dears, we need help in regard of the 3x-8x Vibration Trend Abnormal as shown in the attachment for some of rotating equipment this is example of fan there is also some vertical pump and horizontal pump have same issue one more question why the vibration fluctuating too much what the reason and consequences? thanks in advance
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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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Fin fan cooler with timing belt (2x, 4x FTF)

ordinaryvib ·
Dear all, I found 4 equipment that gives similar spektrum with some discrete peak which I match with the harmonic of cage frequency (FTF) (2X and 4X cage freq.). on the field I think the peak belong to the belt frequency but after a closer look with the desktop software I realized it matched with cage frequency harmonic. Please find the equipment specification below Equipment type : Axial fin fan cooler (2 fan per cell) Driver : horizontal motor mounted vertically Bearing DE (NDE) : 6212C3...
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High horizontal vibration in fan

vishal sharma ·
Dear experts After solving my preheater fan and raw mill system fan problem with your precious recommendation now I want share my new problem that’s I am facing now a days i have two bag filter fan both are 18kw motor. both have overhung impeller.During continues monitoring fan A has high horizontal vibration 12 mm/s at fan NDE side with 1x domination in FFT spectrum. So first I check alignment of fan and I found it’s okay so I start single plane balancing and after balancing vibration...
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Fan Vibration Changing by Inlet Gas Temperature.

Ptayebi ·
Dear Experts One of our Exhaust Fan has an interesting vibration behavior. The Vibration of this fan changes with inlet gas temperature change! (It change between 1 to 7 in horizontal vibration at point 4) But this changing is not in same direction, sometimes the vibration increases with temperature increase and some times it is decreases. The Velocity spectrum shows 1X is dominant. Another interesting thing is the magnitude of horizontal and vertical vibration: for point 4 the horizontal...
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FAN BALANCING PROBLEM

Kishore kumar ·
Dear Members , We have a Fume Hood Fan at our customer site running at 1488 r.p.m and coupled to its motor ,Fan static balance is good but it has 5 mm axial run out at its base plate face . As per the earlier data we have suggested to correct Structural looseness and Alignment , they said done and we tried to balance at site but the results are worst .Again it showing same problem .Here i have attached Balance report and spectrum ,Please share your analysis .
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Stronger vertical than horizontal NDE side and the opposite DE side.

Kamilu ·
Hi. What could be possible, general reasons that there is much larger vertical vibration than horizontal NDE side of a machine, and much larger horizontal vibration than vertical DE side? Ratios are about 3-4/1. And what if there is opposite of this situation? (stronger horizontal NDE and vertical DE)? I experience this pattern on two sets of machines (motor +fan). They are driven via belt transmission. One set (motor + fan) is experiencing the first way, and second set of machines is...
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BOILER FORCED DRAFT FANS

chary tatta ·
Greetings Members, The FD Fans on a tanker vessel attached the vibration spectrum and the photos of the FD fans. Vibration on motor HVA is less than Vibration at fan foundation fitted on pads 3 nos on each side. Appreciate your feed back and suggestions for repairs. Kind regards Chary
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Fan Wall, Fan Array, Fan Matrix?

USMC 08 ·
Regardless of what you call it... Any tips on installing permanent mounted accelerometers on these stacked systems?
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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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ID Fan Anomaly

Chuck Scott ·
Gents, We have an ID fan with new impeller installed. Initially on startup fan will settle at about .06 in/sec horiz inboard fan brg. After several minutes the amplitude would creep up and settle at about .16 in/sec. Off and on it will continue to climb as high as .38 in/sec and then come back down. No change in speed or damper. After shut down... again same thing. Horiz amplitude about 66% of axial. Phase changes range of about 60 degrees just on horiz. Any ideas?
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Repeated Static Unbalance problem in a 2.4 MW ID Fan

The Maniac ·
Dear all, In our thermal power plant, We have 6 ID Fans with scoop control operating from 550 RPM to 700 RPM, 2 fans for each unit whose suction is from ESP. The Fan handles Fly ash and flue gas. impeller is a Double suction Center hung. 2 of the 6 ID Fans gave trouble at regular intervals(once in 6 months) with increase in 1X frequency past 1.5 years and 2 more started with unbalance problems past 6 months. The vibration levels increased from 1 mm/s up to 25 mm/s within a period of a month.
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1200 kW FD Fan Motor dominant peak 100 HZ

y@sh ·
Hello guys , Thank you so much helped me in my previous doubts 1200kw-996rpm-6 pole -BHEL Make Recently i faced some problem of FD FAN motor getting dominant frequency at 100 HZ and abnormal air flow sound observed from the motor. any one suggest me what are the possible defect in the Motor. 1.load condition Ok 2. foundation and structure is normal 3.There is no identification of high temperature According to my knowledge max Electrical defect 1.Pole pass frequency indicates Is there any...
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natural frequency

alainraad ·
how to change a centrifugal fan natural frequency without adding weights
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Vibration Isolators

MarkSl ·
Hi Gents, I took some vibration data today from an overhung fan which is visually vibrating at all locations including the structure and floor. The spectrum shows very high 1xF which is worst at the fan locations (up to 37mm/s RMS) . The 90KW motor...
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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 vibration in Fan Non DE bearing Horizontal direction

Mukesh Chandrawanshi ·
Hello sir I am facing a problem of vibration in overhung fan, Fan is mounted in concrete base , in all point ie motor bearings and fan DE bearing vibration is good in both direction ( axial & radial) but in Fan NDE bearing vibration is high in horizontal direction, Vibration in fan NDE bearing vibration is 8 mm/s and vertical and axial is less than 2 mm/s Sir i can't understand what is the problem in fan ...can anybody help me ??
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1/2X VANE PASS FRECUENCY

ConfMx ·
IN COOLING TOWER FAN, I FOUND FRECUENCY 3X OUTPUT SHAFT GEARBOX, HAVE 6 VANES FAN. ANY IDEA?
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High Vibration - Centrifugal Fan

Yasaswy ·
Hi everyone, My first post here and would like to get your views on an issue we are having with an ID fan (Centrifugal single stage). It has a 3.3 MW motor as well as a turbine (with a clutch). It has a running speed of 1200 rpm. Initially it was run with just the motor before commissioning the turbine. The fan and motor both used to run at 30 micron with dominant 1X. (This was way before in June and I just started looking at this now). So suddenly at the end of June and start of July the...
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Fan vibration at one point only

montaser ·
Dears, Our center hung fan vibration is working at very good condition 1.8 mm/sec, but in case of little increasing on fan bearing (from 1.8 to 3 mm/sec) we face high vibration at one point only on the motor non drive bearing ( from 3 to 17 mm/sec), and just after balancing the fan by reducing 1 mm/sec only the motor vertical vibration reduced from 17 to 3 mm/sec. - The mounted fan on shock absorber. - The point which increased on the motor is the vertical direction. - the dominant frequency...
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Raw Mill Bag House Fan Vibration Critical Issue

Garry Kristen ·
Hi there, I would like to share the vibration trend of our Raw mill Bag House Fan. the fan has been running with abnormal vibration from 4.5 to 7 mm/sec on Horizontal point NDE bearing HH for last 6 months. the main problem is coating and fine dust that is coming from the bag house chambers due to worn and useless bags. this coating build up on fan impeller rapidly and results the fan is unbalance twice in a week. Then we have to stop the fan for a hour and clean the coating by air pressure...
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Need Suggestions for FRP scrubber id fan onsite balancing

Kishore kumar ·
Dear Members , please suggest suitable temporary weight material for on site balancing of FRP Scrubber id fan .Temporary weights to add for balancing after that we add FRP permanently on existing FRP lining .Already fan has FRP lining and we dont have time to remove frp lining . please share your experience .
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motor vibration at 3XTS

Hossam 2 ·
Good Afternoon guys i have a problem related to a motor vibration which is summarized in a dominant 3XTS on motor side in the horizontal direction while 1X and 2X barely visible overhung fan variable speed up to 600 rpm coupling is flexible 14 rubber element and this rubber is new the alignment within tolerance 0.1mm while the max, allowable is 0.5 the shaft has coupling has run out problem 0.25mm and shaft has center runout between the bearings 0.3 mm and near the free bearing 1.7mm i know...
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Shock Pulse & Bearing Defect Stages in FD Fan Motor

Vibuser ·
Dear Guys, I am new with this Areva OneProD / Movipack analyzer. Before i used CSI 2120-2130 more than 8 years. However i found this tools a bit interesting due to it can measure the the bearing Defect Factor (i think similar like Peakvue). Most of the time this analyzer can detect the bearings are lack of lubrication. When we apply greasing and concurrently monitor the G's and bearing defect factor, both are reduced significantly after greasing. But there is a case on a FD fan motor 6.6kv,...
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Induced draft Fan Motor Journal bearing high vibration

Amar244 ·
e have a large capacity (2 No's) Induced draft fans. One of the fan motor is showing high vibration in vertical direction at Motor DE side.Max. vibration is 3.7 to 4 mm/sec. Alarm value recommended by OEM 3.5 for motor vibration.Also abnormal sound from fan to motor coupling noticed.Kindly suggest possible cause. Also can anybody tell possible reason for 6th order dominant frequency in journal bearings?I have seen in many journal bearings such spectrum. Only 6th order is dominant in...
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High 1X vibration in the V and A side

Unplugged.Charles ·
I'm experiencing high 1X vibration. This equipment is double suction centrifugal fan and motor is coupled with fan. And this equipment is installed on the structure with spring mount. - fan : 4000m3/min, Diff P 175.7 mmAq (bearings : 22226, replaced Oct 2015) - motor : 60Hz, 6P, 250kW (bearings : 6320C3, 6219C3, replaced Oct 2015) But motor vibration was increased like this. (vibration unit : mm/sec RMS) 1) Fan NDE : H 0.45, V 1.56, A 1.04 2) Fan DE : H 0.63, V 3.73 3) Motor NDE : H 0.84, V...
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Motor running uncoupled, line side test on single phase had a phase shift between V and I

Kevin Persaud ·
So a coworker and I were at a client today live testing their ACC fans, it's a 480V motor coupled to a right angle gearbox which is coupled to the fans, and the VFD's were in a room below the fans where we conducted the tests. The first one we got to had wacky results so we start troubleshooting the tester (MCEmax.) We put all three current and voltage probes on a single phase of the line side power and find that there is a phase shift between current and voltage. Weird cause normally when...
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High vibration in ID Fan bearings

Jenish ·
Dear Experts, We experience a problem with one of our ID Fans. The machine train is Motor - Oil Flex - Centerhung Fan. The Fan bearings are showing high vibration. Seems like a clearance issue. The clearance between the shaft and the bearing is 2.5 mm. One of the expert suggest for a shaft repair. Shaft OD at present is 179.30mm. Required is 180 mm. Shaft repair is costly and we need a second opinion. Did any of you experience similar problems? Is there any alternative? The vibration...
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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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Vibration fans circulation of Hood_ Paper Mill

RAAL ·
Please your comments: Industry: Paper Mill Area: Tissue Machine - third level Assets: Hood circulation fans Comments: Centrifugal fan, catiliver arrangement, grid coupling, 800 hp - 1780 rpm electric motor Problem: High vibration (20 mm / s) 1xrpm in horizontal direction in a higher percentage in the free side bearing, this high vibration occurs with the burners at full load, with which temperatures of up to 500 oC are reached. The fans are operated at very close speeds, usually with a...
 
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