Tagged With "test"

Topic

Difference between pore blockage and laser test for particle count.

WVJoe ·
Our plant has recently initiated particle count as part of our oil analysis. Some of our samples have been analyzed using the laser method and recently samples have been analyzed using the pore blockage method. Is there any difference in accuracy? Can I compare the two results as apples to apples? The reason I ask is that the pore blockage results seem to indicate significantly lower ISO codes than the laser method results for gear boxes that share very similar conditions.
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performance test

aziz58 ·
hi dear all   i m looking for special software for evaluation and asset performance analysis for gas turbine,compressor,pump ,fan,..that i can insert our process parameter to insure all equipment work at best efficiency .   best regard
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PdMA RIC Test Bad Rotor

Chris184 ·
How many have experience with the PdMA tester and would you suspect a motor with the attached test results to look like the photos. We performed a single phase rotor test and had almost 20% current swing while rotating the shaft, so the fact of a...
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Problems with TPI UltraII

PillarofIN ·
I am having data transfer problem with Test Products International UltraII vibration monitor and C-TrendII software. My monitor syncs with the software and fill a sync folder. No readings appear in the software. The nest time I try to sync...
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Qualification of Pumps in a System

mech39 ·
Hello all,   We had taken a pump out of service due to leakage problem in one of its gaskets. Now, after maintenance, we want to test/ qualify it before installation. My question is; 1. What criteria will be used for its qualification? e.g....
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Surge Test for new machinery installation at site

vikramdeeps ·
Hello Guys , For new machinery installation at site do we really need to do the surge test at the site?
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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.
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Test stand vibration

tcvib ·
We have a motor test stand that I have a question about. We have had a motor that is failing our vibration acceptance tests here. Our spec for overall in .06 in/sec. The motor in question has been sent to the shop and measured good. The issue is that we run this motor at 480V instead of 2300V nameplate voltage. We normally run these motors at low voltage with no issue. The test bed is "isolated", but we have vibration to the floor up to .08 in/sec. We have .03 in/sec Vert and Axial and .12...
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Valve Test Rig

mech39 ·
Hello,   We have performed some maintenance work on a weld neck globe valve. The valve was removed from the system. Now we intend to test the valve before we install it in the system. However, we are having problem in holding the valve,...
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Re: Qualification of Pumps in a System

Y7 ·
Greetings, as leak is not from main casing or it's connected nozzles, no need for hydrotest of the casing. for the joint repir, if welding is done, X-ray and NDT is required. later after installation, service test is required.
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Re: Qualification of Pumps in a System

candy ·
Which gasket is it? The pump was manufactured based on what standard eg on its nameplate? Which is the OEM?
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Re: Qualification of Pumps in a System

candy ·
What pump type is it?
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Re: Qualification of Pumps in a System

mech39 ·
Thanks for the responses it is a centrifugal pump based on API-610. The gasket is made of Teflon. The question is, should the pump be tested on same pressure as the piping system has been qualified or just a leak check will be fine? For example, if the system was qualified on 10bar, should we give 10bar hydrostatic test to the pump or not? Regards
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Re: Test Bed Motor and Blower

Walt Strong ·
Add suction and discharge ducts to outside the room/building. If still too noisy, then add suction and discharge silencers. How quiet do you want it? Is the dB value an overall A-weighted level or something else? Where did you make the measurement? Do you know anything about acoustics and noise control? If not, then consider hiring an expert! I do noise control. Walt
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hi, This is placed in open space so no use putting a duct. Kindly advise what other changes i can do.
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Re: Test Bed Motor and Blower

Walt Strong ·
Why are you operating fan without ducts? Certainly cannot do fan performance tests, so perhaps you are making a short run for vibration test or balancing? What is duration of operation? Can you put fan in a noise controlled enclosure or build one around it? Sound level can be reduced by reducing speed, but pressure and flow are also reduced. There are some methods of "quiet fan design", but you would need an R&D project to develop it. You can always use personal hearing protection or...
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Re: Test Bed Motor and Blower

Avinash Thawani ·
I plan to reduce the speed of the motor so the fan speed is reduced.
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Re: Test Bed Motor and Blower

Dan Timberlake ·
I too am curious what testing can be done with no duct work, except maybe running- in before shipment. In which case ear protection is the way I'd go (and eye protection for the dirt and dust being flung around). Some designs need ducting to prevent drawing excessive power in "free air" condition. At least it is anchored down when running. Are there only 4 anchor bolts, and none under the motor section? It is hard to see in the video. Are vibration measurements part of the testing? I...
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hi, I am going to be doing vibration analysis on the following machine which is the motor and the blower. There is bolting properly done. Please find attached spectrum's of the motor and blower. Kindly advise what to do next.
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Re: Test Bed Motor and Blower

Avinash Thawani ·
How to improve alignment
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Re: Test Bed Motor and Blower

Walt Strong ·
Why are you asking about alignment? You have a machine with 4-bearings, so where were the vibrations measured and in what directions; horizontal, vertical and axial? (forget about X,Y, Z unless you specify the correct orientation!) What is the shaft speed? What are the frequency and amplitude values of the dominant frequencies? What instrument and software did you use for these plots? Walt
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Re: Test Bed Motor and Blower

Walt Strong ·
Your first photograph showed the blower sitting on a floor or ground. I would suggest bolting it rigidly to a foundation base or setting the base on rubber pads or mounts. At the very least, this would minimize vibrations caused by loose structural connections, and perhaps it would keep the vibrations repeatable from one run to the next. You have asked for help, but you have provided very little information to work with. A poorly labeled vibration spectrum is difficult to work with; like it...
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Re: Test Bed Motor and Blower

fburgos ·
Add a silencer. do you align before or after bolting, it might need realignment, also your spectrum right now its useless without information, where does the data come from, type and number of bearings, machine speed, line frequency, number of vanes?
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hello, I have changed the speed of the motor to 960 RPM. This is a 2 HP, 3 Phase Motor. The noise level has gone down so that is not a problem now. I am get a 3X peak in all bearings as shown below. Kindly advise what to do next.
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Re: Test Bed Motor and Blower

Walt Strong ·
The highest vibration level is at the motor drive end bearing in the axial direction. It is also high in the other directions. If you say that the peak vibration is at 3X shaft speed, then I would suspect you have a loose bearing or a very worn bearing. It's very difficult to expect anyone to view a vibration spectrum with a frequency range of 3000 Hz and pick off details. It would be more informative if you had a spectrum with a much lower F Max and with cursor marking the high vibration...
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Re: Surge Test for new machinery installation at site

Howard Penrose ·
The only reason you would perform a surge test at your site, for standard equipment, would be if your own acceptance criteria calls for it. Normally, the only recommended test for electrical equipment would be an insulation to ground test for safety purposes. That being said, I normally perform low/high voltage motor circuit analysis (motors and transformers and related runs) and a polarization index in order to verify that the new or repaired machine has been completed correctly. However,...
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Re: Surge Test for new machinery installation at site

vikramdeeps ·
Howard I think you misunderstood my question.I am asking about the surge test for new centrifugal compressor at site.
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Re: Test stand vibration

John from PA ·
I once consulted for a motor OEM that had similar issues. After taking data I simply asked them to drive some steel wedges around the test bed; perhaps three wedges on the long side and two near the corners on the short side. The vibration dropped dramatically. The test bed was supposedly isolated but was driven to resonance with the particular combination under test.
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Re: Test stand vibration

Shurafa ·
Structural resonance is possible but more data is needed to confirm. I remember a very similar case where the shop people dismantled the motor doubting an internal problem. They in fact, performed a very fine balancing job (for the second time) to reduce the vibration. The combination of that motor and test stand did not produce a happy marriage. I recommend in your case to conduct an impact test in both directions. Please share with us the plots if you can. With respect to the inspection, I...
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Re: Test stand vibration

Dan Timberlake ·
Does the vibration drop instantly when the power is cut? Got pictures and drawings? Do you have frequency info to understand why the overall is over .06 in/sec. ? Without frequency and phase info the battle is pretty much lost. Finding A solution will immense amount of trial and error, or an immense amount of luck Are you using peak or rms readings? I'd make a map of the vibration and phase horizontally from the shaft CL down to the floor. Also vertically at all 4 motor feet, and each...
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Re: Difference between pore blockage and laser test for particle count.

rgf12 ·
The methodologies are different so the "accuracy" cannot be compared. The laser or any optical based particle count will include everything that blocks the signal-wear particles, water, varnish etc. The pore blockage only counts the captured particles. In gas turbine LOA where varnish is an ongoing issue I always run both-if there is a big difference between the 2 (> 3 or 4 ISO codes) I know I have something in the oil that needs to be investigated. Take a look at the ASTM test codes and...
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Re: Difference between pore blockage and laser test for particle count.

WVJoe ·
Very good. Thanks.
Topic

Test requirement of coupled motors in a new petrochemical plant construction site.

Ratheesh ·
Respected members, I have two queries regarding the new motors which are factory coupled to the pipeline with in a package equipment..This is in a petrochemical plant construction site. 1)What are the pre-start up testing requirement?Can you give the standard reference for this?We have done winding resistance and megger test on these motors.Is it mandatory to check vibration for the factory aligned coupled motors at site?We dont have any vibration test record from the factory. 2)If vibration...
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Re: Test requirement of coupled motors in a new petrochemical plant construction site.

Gary Stacey ·
I would certainly test vibration for the installation. Dependent upon construction you will possibly need HVA readings at each bearing location in Vel/Accel. Manufacturers may be able to provide vibration limits for this otherwise its just a case of using to ISO standards or similar (regional equivalent?) to compare against. Bearing manufacturer's may be able to provide limits for levels of acceleration for their rolling element bearings (if fitted). You can of course compare each motor...
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Re: PdMA RIC Test Bad Rotor

electricpete ·
When I click on the link, it says "error, file not found"
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Re: PdMA RIC Test Bad Rotor

Chris184 ·
Originally Posted by electricpete: When I click on the link, it says "error, file not found" interesting...it wont let me re upload either...
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Re: PdMA RIC Test Bad Rotor

electricpete ·
Maybe try renaming it to something without any spaces in the filename (I don't know about this board, but some computer systems are fussy about that).
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Re: PdMA RIC Test Bad Rotor

Chris184 ·
Originally Posted by electricpete: Maybe try renaming it to something without any spaces in the filename (I don't know about this board, but some computer systems are fussy about that). ok lets try that
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Re: PdMA RIC Test Bad Rotor

Dave Reynolds ·
That rotor is toast! Hard to believe the pdma testing did not show a fault, but keep in mind if the aluminum cooled and created a path/circuit, the rotor could check good. IF you did an online pdma test you would have most likely seen a fault. Do you have any vibe data on this motor? Besides the single phase test did you put the rotor in a growler or use magnetic paper? Did these tests also show an open rotor bar? Dave
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Re: PdMA RIC Test Bad Rotor

Chris184 ·
Originally Posted by Dave Reynolds: That rotor is toast! Hard to believe the pdma testing did not show a fault, but keep in mind if the aluminum cooled and created a path/circuit, the rotor could check good. IF you did an online pdma test you would have most likely seen a fault. Do you have any vibe data on this motor? Besides the single phase test did you put the rotor in a growler or use magnetic paper? Did these tests also show an open rotor bar? Dave we did use the magnet paper and there...
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Re: Problems with TPI UltraII

John from PA ·
"They" being the US people? I'd try emailing the people on the other side of the pond.
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Re: Test requirement of coupled motors in a new petrochemical plant construction site.

Gary Stacey ·
Not sure what you mean by this. I tend to test all installations no matter how small as part of a quality assurance process. Gary
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Re: Test requirement of coupled motors in a new petrochemical plant construction site.

Ratheesh ·
Than you Mr.Garry.Is there any capacity limit for these test requirement.For example below 7.5 HP not required like that...?
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Re: Test requirement of coupled motors in a new petrochemical plant construction site.

Howard Penrose ·
Rathesh I'm really not familiar with any general commissioning standards for the motors in petro-chem other than the API 541 and 547 standards for the motors themselves. I believe that IEEE Std 841 motors meet these requirements. There are still best-practices associated with electrical and mechanical testing to ensure reliability. At a minimum, continuity and insulation resistance (IEEE Std 43-2013) and vibration analysis. You can go the next step and perform high/low voltage Motor Circuit...
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Re: Test requirement of coupled motors in a new petrochemical plant construction site.

Shurafa ·
I would rather emphasize on what is bounden between you and the other parties. The contract usually is the primary reference. What you may find acceptable and fair might not be for the others. For them, it might be too little or too much based what they agreed on with you. Many times, contacts are not detailed enough and they usually refer the parties to other references. You may end up with API, NEMA or I SO but I cannot assume. Good luck. Regards-Ali M. Al-Shurafa
Topic

Help with problem on Cat II test

Huddle_House ·
I am no stranger to vibration but was studying over this information for my upcoming CAT II test and ran across this problem that I cannot understand how they got the answer... it seems so simple but I have yet to find out how to work it out correctly. Can anyone help me to see how they arrived at this answer?
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Re: Help with problem on Cat II test

John from PA ·
I get about 9.2 hz based on about 5-1/2 cycles occuring in 0.6 seconds.
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Re: Help with problem on Cat II test

Huddle_House ·
Thanks...yeah I'm getting that too but the answer key says "B"... 11.59 Hz ???
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Re: Help with problem on Cat II test

Walt Strong ·
John, I did not prepare the test and apparently neither did you; although your attachment differs from OP! No test instructions were provided by OP. The question appears to be multiple choice with no 5th choice for "none of the above". You can argue that the question is poorly worded or that you are more correct than Answer-B. You also assumed that a peak occurred at Time = 0.0, but that cannot be proven without seeing the what occurred before that. I choose Horseshoes on this one! Walt
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