Tagged With "compressor"

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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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Atlas Copco ZR 400

davidWHITMAN ·
Anyone have configuration information on an Atlas ZR 400 Compressor? Looking for gear tooth, lobe counts and bearings. Thanks in Advance david
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Acceleration levels over 100g's

Oil Can Boyd ·
What are the capabilities of standard 100mv/g accelerometers when it comes to g's. Are readings of over 100 g's really a possibility. Seems to me to be a lot of accelerator saturation creating the extremely high values and they are probably not real. I guess if these values are real it would be a pretty unsafe area to be around. The piece of equipment I'm looking at is a Rotary Positive Displacement Compressor made by Allis Chalmers, Ro - Flo Compressor.
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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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Coupling Element Failure

MarkSl ·
Hi Guys,   The attached coupling element recently failed on an Atlas Copco GA160 compressor. It appears to have 24 "teeth" on the element, would you expect to see an increase in amplitude at 24x run speed.  
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Compressor lube Oil flushing acceptable creteria

vikramdeeps ·
Guys , Generally for new compressor oil piping , we will do oil flushing for the lube oil system by installing fine mesh at identified locations , I just want to know the acceptable criteria for particles in mesh .
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Cyclic 1x fluctuation in compressor motor

Reliable Analyst ·
i have 3 Natural Gas Compressors, 2 runs in parallel to fulfill plant requirement, We have an issue on one of the compressor that 1x of motor fluctuates by 0.6mm/s rms. the details of the equipment is as under. Motor 2-Pole AC induction journal...
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Gas turbine - Compressor blade damage

adisorn sri ·
Who have some problem same us? We used gas turbine model V94.3A. On 1st MO'2015, we found damage on compressor blade. Moving blade stage 7 fracture 3 EA. Its become FOD and damage to other stage. For RCA It's start the problem with tip blade...
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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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Gearmesh Frequency Question

P. Hine ·
This is a Centac Air compressor( Mod 2CV25M3E) driven by a 600 HP motor. Any guesses as to what the gear mesh frequency might be? Reading was taken with a 10mV high frequency accelerometer at 12800 lines resolution. I am still trying to find some info...
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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...
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Marine Air compressor 880 rpm Sperry make

chary tatta ·
Dear Forum members, Attached is the FFT profiles of Air compressor end and Motor end profiles Horizontal, vertical and Axial profiles. Q1. on compressor side at high 1X. Q2. The overall vibration also showing high on vertical on engine end and marine classification societies recommended maximum satisfactory value 18 mm/s RMS. Appreciate your comments and countermeasures suggestions. Regards Chary Tatta
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NDE probe spurious spikes for Centrifugal Compressor

hanymaly ·
We are facing a spurious spikes from only one radial probe (X) from NDE of Centrifugal compressor driven by a steam turbine. all other 7 probes are normal (y of this radial ,x&y of compressor DE,X&Y of steam turbine DE and NDE) and no any abnormal process conditions existing. We made everything (replaced the probe,the extension cable, the SPD (surge Protection Device) and the proximitor)..all replaced by new ones but problem still exist. extension cable is in a metallic conduit..we...
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Reciprocating Compressor packing vents provided with check vlaves

vikramdeeps ·
Guys,One question.. I am curious to know.I have seen some recip compressors with check valves and without check valves in packing vent lines so do we really need check valves in packing vent lines connected to flare? What can happne in case of no check valves in packing vent lines?I there any standard or spec to provide check valves in packing vent lines
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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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Re: Coupling Element Failure

John from PA ·
I'm assuming you ask the question because you have measured a 24X component and now trying to establish a source. The best answer I can offer up is "Maybe". But perhaps the coupling having 24 teeth is just a coincidence. Isn't the GA160 a VFD driven machine? If so, and somewhat dependent on the motor controller, the 24X could be a result of the VFD drive. It is well known that some VFD's exhibit strong torsional harmonics at 6x, 12x, 18x, and sometimes 24x running speed. The 6x harmonics are...
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Re: Coupling Element Failure

Edwin de B ·
Excuse me to correct you, John. But the 6X generated by a vfd is not 6 times running sped, but 6 times power supply line frequency. In this case I suppose the question is: "Why did't i see a 24X increase before te coupling element broke?" Isn't this element very dry? As fas as I know, a tooth-coupling needs to be lubricated. If it is not, it wil lock an break down. The high 24X will be seen at/before a coupling lock. But the time between lock and breaking down can be very short. So it can be...
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Re: Coupling Element Failure

Walt Strong ·
Mark, If the entire drivetrain including VFD was supplied by Atlas Copco, then I would request a torsional vibration analysis from them. My guess is that one was never made, but could be totally wrong! Walt
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Re: Coupling Element Failure

MarkSl ·
Originally Posted by Edwin de B: Excuse me to correct you, John. But the 6X generated by a vfd is not 6 times running sped, but 6 times power supply line frequency. In this case I suppose the question is: "Why did't i see a 24X increase before te coupling element broke?" Isn't this element very dry? As fas as I know, a tooth-coupling needs to be lubricated. If it is not, it wil lock an break down. The high 24X will be seen at/before a coupling lock. But the time between lock and breaking...
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Re: Coupling Element Failure

J. Heber ·
The Atlas Copco's I am use to have a Woods elastomer coupling..looks very similar to yours. As for the 24X I've never seen that but there a bunch of frequencies associated to these compressors, could be easily masked. As Randy said, I usually a increase in 1X as the coupling starts to fail...very short time period between starting to fail and full coupling failure. I believe the elastomer is part of the 25,000 or 32,000 hour PM. There have been several time the coupling doesn't make it to...
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Re: Coupling Element Failure

Danny Harvey ·
In order for the coupling to generate 24 x rpm the teeth on either ring would need to be contacting something stationary.
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Re: Coupling Element Failure

John from PA ·
Originally Posted by Edwin de B: Excuse me to correct you, John. But the 6X generated by a vfd is not 6 times running sped, but 6 times power supply line frequency. In this case I suppose the question is: "Why did't i see a 24X increase before te coupling element broke?" Isn't this element very dry? As fas as I know, a tooth-coupling needs to be lubricated. If it is not, it wil lock an break down. The high 24X will be seen at/before a coupling lock. But the time between lock and breaking...
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Re: Coupling Element Failure

MarkSl ·
OK how would one know that any increase in 1x amplitude would be related to a coupling issue and not the usual umbalance or possible structural issues?
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Re: Coupling Element Failure

Edwin de B ·
If you have a clear 1X in the spectra, you will also recognise it in a time waveform. What I do than is take some 2 channel measurements with the normal datacollector with two accelerometers on it. Measured over the coupling (so both sides) and determine if the 1X component is in phase on both sides, or it is in anti-phase. If it is anti-phase, so shifted 180°, the source is between the measured points, so the coupling.
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Re: Coupling Element Failure

Nockingroll ·
If it were a fatigue problem, I'd suggest maybe a gradual increase in 1X axial and/or radial, as opposed to misalignment that will be evident straight after maintenance that would affect shaft alignment. If it were imbalance it would depend on the situation, maintenance?, like a new or repaired impeller or it could also be gradual due to conveying an abrasive product. You could use cross phase and other techniques to rule out what the 1X is or isn't. Lots of variables on this most...
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Re: Coupling Element Failure

Walt Strong ·
"OK how would one know that any increase in 1x amplitude would be related to a coupling issue and not the usual umbalance or possible structural issues?" Mark, Most practitioners soon recognize that vibration at 1xSS can be a symptom of many different (some related) faults or fault conditions. The process of elimination of possible causes is the approach I use, especially if relying only on one tool/method (vibration). Measuring shaft alignment and inspecting the shaft coupling is generally...
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Greetings Mr. Shurafa Thanks for your reply. Pleased to receive your opinions and the contents you exposed are valuable. 1. Yes ,the low frequencies are not affected significantly. 2. The ratio between Horizontal: vertical:axial is indicating 2:4:1 style approximately referring to foundation issues. 3. The vibration isolators damping effect reduced over time of 15 years (No record of renewal vibration isolators available, as this ship ownership changed 4 times. 4. The rubber vibration...
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Re: Marine Air compressor 880 rpm Sperry make

Rennie Cachia ·
Dear Mr. Tatta, May I ask where can I find "classification societies recommended maximum satisfactory value 18 mm/s RMS" you mentioned in your initial postings please? Is there an internet link which I can access? Thank you. regards
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
One possibility, ISO 10055:1996 Mechanical vibration -- Vibration testing requirements for shipboard equipment and machinery components. Reaffirmed in 2012. It is available for purchase online at http://www.iso.org/iso/iso_cat...l.htm?csnumber=18020 . There are likely other specifications as well.
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Dear mr. Rennie Please find attached DNV GL vibration standards for ships. thanks Chary
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Re: Marine Air compressor 880 rpm Sperry make

Rennie Cachia ·
Dear John & Chary, Thank you for your information. regards
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Re: Atlas copco compressor concerning vibration values

Hossam 2 ·
MEASUREMENT POINT OVERALL LEVEL ----------------- ------------- 741.CP114 - Compressor # 5 (05-Jan-16) OVERALL LEVEL M1H 2.463 mm/Sec M1P 1.980 G-s M1V 3.871 mm/Sec M1A 3.530 mm/Sec M2H 2.111 mm/Sec M2P .893 G-s M2V 5.044 mm/Sec M2A 4.309 mm/Sec C1H 3.863 mm/Sec C1P .251 G-s C1V 3.834 mm/Sec C1A 4.898 mm/Sec C2H 7.221 mm/Sec C2P .117 G-s C2V 7.263 mm/Sec C2A 8.093 mm/Sec
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Re: Atlas copco compressor concerning vibration values

Dave Reynolds ·
One reading at one location is difficult to asses a machines health. You do not state what is your symptom? Hi oil temp, poor performance, noise.... Your trend is stable on your one plot you posted, yes air compressors have vane pass/all of them, you have 32 g's pk=pk on your plot, has this value been stable or is it increasing overt time? Was the compressor loaded at the time you took data? Vane pass typically increases and decreases when the compressor is loaded or unloaded, dirty/plugged...
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Re: Atlas copco compressor concerning vibration values

Hossam 2 ·
thank you for your attention firstly the pk-pk value is stable for months 2)no complain came from this compressor but the vibration values was concerning comparing to the other compressors as the values is way smaller than this one 3)the compressor measurements conducted while loading the compressor 4) the atlas copco used to performing their schedueled maintenance each period to change filters..etc. 5)C*p and M*P peakvue values yes and they are stable at the trend over 2 years
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Re: Marine Air compressor 880 rpm Sperry make

Shurafa ·
Can you post the file in a pdf format? I could not open the file (though it could be an issue in my device). Q1 is not clear. Are you asking to verify if the hight component is at 1x the running speed? Regards-Ali M. Al-Shurafa
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
I've attached the data as a PDF. To the OP, can you explain the differences between point 1, point 2, point 3, etc. They are meaningless as is. A detailed description of the machine, beyond "Marine Air compressor 880 rpm Sperry make" might be helpful.
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Re: Marine Air compressor 880 rpm Sperry make

Shurafa ·
83 mm/sec rms (~3.33 in/sec rms) is really too high. Are the readings real?
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Greetings Forum Thanks for your reply. I would like to point out the following- 1. We're sending you this notification because you are either following the forum, the content, or the author listed below- This point I am not understanding, where I am doing mistake. Please correct me. 2. I sent the air compressor FFT format in HVA - Triaxial mode and in word document. If pdf to attach I will send in PDF mode in future. 3.I requested to send your opinions on the FFT analysis and problems...
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
Re: Marine Air compressor 880 rpm Sperry make
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Hi team members Good morning Please find the attached FFT spectrum for the compressor in pdf format. Q1. The 1x amplitude is high in vertical direction about 83 mm/s RMS and in Horizontal 1x is 16 mm/s RMS & 2x is 18mm/sRMS- what are the possible causes to indicate high vibration levels. Q2. What are the corrective actions suggested to reduce the vibration levels. I hope the problem is presented correctly to forum Thanks and regards Chary
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Dear Mr. John Good morning Thanks for your reply and appreciated your corrections. 1. Understood the point, in software, i did not entered the horizontal , vertical and Axial and the fourth one is foundation resilient mounting vertical direction. 2. The highest reading is point 1 in vertical direction. followed by are Horizontal, Axial and foundation at resilient pad in vertical direction. 3. Motor end is also followed in similar way point1 is vertical, point 2 is horizontal and point 3 is...
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
Item 2, specifically that the vertical is the highest, and your use of "Marine" makes me wonder. Is this being measured on a ship? If so, dockside or at sea?
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Thanks Mr. John You are correct. 1. Vertical is highest compared to Horizontal in fundamental frequency 875rpm. 2. This reading taken on a ship, crude oil tanker,175,000 dwt, 300meters long, 35 meters broad and 25 meters depth, located in Engine room at anchorage at sea not on dock side. regards
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Re: Marine Air compressor 880 rpm Sperry make

Kishore kumar ·
Re: Marine Air compressor 880 rpm Sperry make
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Good morning Mr. kishore Thanks for your reply and highlighted the points. 1. Well appreciated your points and the rusted or wear bolts and nuts at mountings and soft foot I found those places are clean, in ballast condition with 5 meters trim by aft i.e. ship aft draft is 12 meters and forward about 7 meters at the time of vibration reading taken. 2. Engine is on the Aft End, and running condition, appreciate your focus on 0.41X with 50 mm/s RMS. 3. Yes, at my next examination I will...
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Good morning Mr. kishore Please ignore the 0.41X measurement I wrongly posted that was in diesel generator issue in other question. Thanks for your reply and highlighted the points. 1. Well appreciated your points and the rusted or wear bolts and nuts at mountings and soft foot I found those places are clean, in ballast condition with 5 meters trim by aft i.e. ship aft draft is 12 meters and forward about 7 meters at the time of vibration reading taken. 2. Yes, at my next examination I will...
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
Taking measurements on a vessel at sea, even docked or at anchorage can be tricky. There has to be a method of filtering out the low very vessel movement that is dominantly in the vertical direction. That is one of the reasons the U. S. Navy at one time only allowed readings taken with a velocity coil which by its very construction has a high pass filter that essentially removes low frequency content due to vessel movement. I note as well your comment "Please ignore the 0.41X measurement I...
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Re: Marine Air compressor 880 rpm Sperry make

chary tatta ·
Greetings Mr. John Thanks for your reply. I have taken many compressors during sailing at sea and at port alongside berth, anchorages. Even on this ship, other compressors also showing similar vibration levels at 1x high in vertical direction. I am using vibrio 4900m Adash instrument with single channel and DDS2014 software. There are many other makes of compressors like Hatlapa on spring foundation about 14-16 mm/s RMS in vertical direction, Tanabe compressors low is about 5-6 mm/s RMS in...
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Re: Marine Air compressor 880 rpm Sperry make

John from PA ·
What transducer are you using? Does the particular problem machine rest on a spring foundation or some other type of foundation?
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Re: Marine Air compressor 880 rpm Sperry make

Shurafa ·
Your vibration record is neat and informative. I like it. I assume that your motor is powered by a 60 Hz AC 3 phase electicity. I assume it's synch speed is 900 rpm. I suggest to measure the background vibration. If possible, shutdown the unit and take the measurements exactly the same way you did while the unit was running. If this really impossible, at least measure the vibration of the floor. It seems the compressor is mounted on springs. Are these supports in good condition? Anything...
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