Tagged With "measurement"

Topic

Measuring amount of static build-up in oil

JeremyG ·
Hi All   Maintenance person working in a tank farm area here.   Circulating lubricating oils, especially through a filter/strainer, would cause static electricity build-up in them. Suppose we were to perform a recirculation with the product...
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

Why we are mesuring vibration in three directions ?

Ganapathi ·
Dear All, I would like to know below points please anyone can give your valuable answer for below . Why we are measuring vibration readings in three directions ? and what is the reason for measuring vibration in these three directions ? and why we are measuring Acceleration or peak or in Horizontal direction only?
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Re: Temperature Measurement Gun

MarkSl ·
Hi Abonoor, Have a look at the FLIR TG165 IR Temperature Gun
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Re: Temperature Measurement Gun

rgf12 ·
They are readily available from quite a few sources-I have seen them from $29 to $300. I don't leave the office without one stuck in my back pocket. I would base your purchase on the use of the gun-if your just trending temperatures and are not going for absolute accuracy I would go for a cheaper model. Remember consistency in the measurements is key and the bearing housing temp is anywhere form 10-20 degrees cooler than the bearing internal temperature.
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Re: Temperature Measurement Gun

waldroal ·
This may not need be said, but when you do purchase one and use it in the field, keep the spot size ratio in mind. I've seen quite a number of people use these and not be aware that the further away you are the larger the measured area is.
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Re: Why we are mesuring vibration in three directions ?

John from PA ·
Start with this... http://www.bksv.com/doc/br0094.pdf Very old but still very good for the beginner.
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Re: Why we are mesuring vibration in three directions ?

edisonindia ·
John That one looks very similar to the IRD Mechanalysis notes I have had from late eighties. Who copied whom?
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Re: Why we are mesuring vibration in three directions ?

Shurafa ·
The 3 directions are used to evaluate the motion (vibration) in the space. Usually the largest motion will be the most important and they are almost always unequal. One can record the (translation) motion of the bearing housing in all possible directions which are 3 per basic physics. Recall 3D. This approach is oversimplifying the real physics of the machine but it serves the practical applications. An important assumption is that the bearing housing acts as a rigid object or like a point.
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Re: Why we are mesuring vibration in three directions ?

John from PA ·
I think the Bruel & Kjaer publication I linked to may have been first. I got my copy in the late 1960's when I was initially involved with vibration and acoustics.
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Re: Measuring amount of static build-up in oil

JeremyG ·
Good links Have found the following API code(API 2003) regarding static build up in lubricating oils, and how to manage them. Basically -Electrostatic Voltmeter (if a way can be found to immerse it in a reservoir) -Charge density Meter (designed to operate immersed in a charge non-conducting liquid) Cheers
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Re: Measuring amount of static build-up in oil

John from PA ·
The article at http://www.machinerylubricatio...t_pos=0&at_tot=1 may be of interest and probably this one to a lesser degree. http://www.machinerylubricatio...tic-charge-hydraulic
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Re: Measuring amount of static build-up in oil

Walt Strong ·
I have no direct experience with this, but Google: "measure static electricity with voltmeter" for lots of possibly good information. Walt
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Re: Temperature Measurement Gun

Callum S ·
If your not stuck on IR temp measurements and willing to go with contact measurement the SKF thermopen is an excellent tool. Inexpensive reliable and accurate. I have used these for years and recommend. http://www.skf.com/group/produ...rmometer/index.htmle .
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Re: Temperature Measurement Gun

shiek ·
Have a look on FLuke 568 Ex model. Its Intrinsically safe also. If you are looking for IR thermal Imager Look for Fluke TRI32 model.Its Good.
Topic

SAP EAM Capability for Condition based Maintenance

Amol Khairnar ·
With SAP, you can achieve condition based monitoring using simple measuring points & some customization code. Which triggers a maintenance work order when required conditions are met.
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setting measurement

David Cop ·
Hello everybody. I am a novice in the field of vibration. Can you help me ? 1/ which measurement task do i choose? (overall velocity, spectrum, envelope...) 2/How to setting measurement (fmax, sample rate, LOR, filter, window, overlap, average...)? Thank all very much. Have a nice day. David
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Re: setting measurement

ivibr8 ·
Totally agree with RGF12. There is not enough memory in this text field to to answer your question. We don't know your situation, but sounds like you need some outside help (more than can be provided on a forum like this). However, you can start your learning process by going to various websites to get preliminary knowledge. You might want to start at the knowledge base of Mobius Institute http://www.mobiusinstitute.com...nding.asp?LinkID=106 After that, consider introductory courses in...
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Re: setting measurement

rgf12 ·
Your questions is too broad for a coherent answer as each of the setup options you asked about would be appropriate for individual cases depending on machine details such as running speed, type of bearings, presence of gears etc. I would suggest you look for a rotating equipment vibration fundamental book or papers to familiarize yourself with the basis concepts. When I first started in the mad science of vibration analysis I attended a vibration fundamentals course given by IRD that covered...
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Re: setting measurement

John from PA ·
Go here, http://www.bksv.com/Library/Primers , and bookmark the URL. Then scroll to the bottom and click on Primer: Measuring Vibration. After reading that you may wish to go back to the parent URL and explore other topics or post some more specific questions.
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Re: setting measurement

David Cop ·
Thanks everyone
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Maintenance Metrics you shuold be measuring

Amol Khairnar ·
http://www.reliableplant.com/Read/30590/maintenance-metrics-measuring
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Re: Maintenance Metrics you shuold be measuring

Ken Staats ·
The metrics are interesting from an equipment perspective. Do you have any around FTE productivity? I am interested in labor hours per tasking.
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Set up for Gearbox Vibration Measurement point

Mrunal Dave ·
Dear Vib Legends, We are about to set up the vibration measurement points for gearbox (N1: 1488 rpm, no of teeth unknown) with the following : 1. Velocity spectrum (Fmax 120000 cpm, 3200 and 6400 lines, 4 linear Averaging with hanning window) 2. Acceleration and Env Spectra: Your inputs are required. Please advice. We are awaiting for some reference set up examples. 3. Time waveform analysis: Fmax 5850 Hz, 4096 samples. Please suggest if required some correction or your inputs please for the...
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Re: Set up for Gearbox Vibration Measurement point

Mrunal Dave ·
Thanks John and DBTCMP, We are trying hard to get these data. Will update as soon as we get it. N1 is measured RPM of motor shaft i.e. input / high speed shaft of gearbox.
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Re: Set up for Gearbox Vibration Measurement point

DBTCMP ·
Your at nothing until you identify the gear teeth and intermediate shaft speeds, spend your time getting that information, as for setup, the information you discover in the first part of my answer will guide the direction of this, hat basis are you going to use the setup you outline?
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Re: Set up for Gearbox Vibration Measurement point

John from PA ·
You've provided N1 = 1488 RPM. Is that a measuremed speed or off the nameplate?Is there nameplate data that would give you the output speed?
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MTBF... is it telling you anything?

Ammar Alkhaldi ·
Hi All, Before sometime ago I wrote an article about how wrongly MTBF is used, specially in the process industry. I wanted to share this with you and I'd like to know what do you think about it as maintenance professionals. https://www.linkedin.com/pulse/real-reliability-stop-abusing-ammar-alkhaldi-cbbss- Regards
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Re: Set up for Gearbox Vibration Measurement point

Akhil Rathore ·
If you can share the make model of the Gearbox, Also number of teeth is utmost necessary to setup the database as well as to analyse the vibration data captured. You cannot move a step ahead without this.
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Re: Set up for Gearbox Vibration Measurement point

John from PA ·
Do you know if this is a speed increaser or decreaser? What is being driven?
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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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Re: Axial or Thrust Position Measurement Using Proximity Sensor

John from PA ·
The voltage components are not any different than in the case of a radial proximity probe. The AC component is the dynamic motion of the shaft; think of it as axial vibration. The DC is proportional to the average gap between the probe and the shaft target area; think of it as position. The monitor used will likely be different between the case of a radial or axial probe. In the instance of the radial probe the monitor usually will display a value of vibration based on the AC voltage...
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

Vibrave ·
John, Thanks for your quick response and clarification. So AC component signal is used for radial vibration and change in DC component signal is used for axial position monitoring.
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

John from PA ·
Let me elaborate! The AC signal is the dynamic response of either a radial or axially mounted proximity probe. In the case of a radial probe, it provides radial vibration; in the case of an axial probe, it provides axial vibration. And again, in either case, the DC component provides position information. With two radial orthogonal probes position information can then be the basis for a shaft center line plot. In the case of an axial transducer, the DC component provides position...
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

John from PA ·
You mention supply voltage but that is not actually the -10 vDC used in the example. Typically the terminology supply voltage refers to the voltage supplied to the proximitor from the monitor power supply. This is typically -24 vDC. When the transducer is gapped to about -10 vDC, the physical distance between the probe tip and target is about 55 mils. See the "typical" output curve I've supplied. Your math is correct for a transducer that has a scale factor of 0.2 v/mil or as you have...
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

William_C._Foiles ·
I believe that you will find that the voltage you supply is not -10V dc. The monitor has a reference voltage to set. This reference has to be set based on the physical thrust position. Often, this voltage gap reference is set to correspond to the physical thrust center; although there are variances as to how some people prefer to set the reference. The probe system has a voltage at the physical center (or other reference point) of the thrust bearing. This needs to be set as the monitor...
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

Vibrave ·
John, Do you mean axial displacement or thrust value that monitoring from proximity sensor in centrifugal compressors or turbines or pumps thrust bearing (eg. Measuring Unit: +0.1mm or - 0.2mm) is converted from AC signal? I understand DC is supply voltage for both radial vibration and axial position monitoring. The response to the supplied DC voltage that returned as AC voltage signal (eddy current) due to motion and shaft material conduction which converted to radial shaft relative...
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

Vibrave ·
William, so it means supply voltage is DC and measuring voltage is also DC for axial displacement or position monitoring. If supply Vdc is -10V (centre reference voltage) and the gap voltage due to change of axial position from centre is 9.0 Vdc means 10 V - 9.0 V/0.2V/mil = 5 mil (0.127 mm). Does this makes sense and my understanding is correct?
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Re: Axial or Thrust Position Measurement Using Proximity Sensor

William_C._Foiles ·
What John said makes sense. The DC portion of the signal goes to the thrust position. Additionally, a center value (DC) is required for this measure at the monitor. How much the DC signal varies from the center reference value gives you the thrust position.
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Re: MTBF... is it telling you anything?

EngineerZaheer ·
Good
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Generating "Abbreviated Last Measurement Summary" of multiple surveys

engr.Abdullah ·
Hello, While performing a corrective action, we acquire vibration data of the whole equipment before and after Field Balancing/Laser Alignment. When submitting report, we show vibration data before and after the corrective action. While using CSI 2140, we acquire the vibration data after the corrective action by creating new survey. When we dump the data in AMS Software, we cannot generate abbreviated last measurement summary of both surveys. I couldn't find any such option in AMS suite. Is...
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Recommended Vibe measurements for a high speed air compressor

CharlieRB ·
I have a high speed air compressor running at 59.58 Hz. motor speed with a High Speed gear mesh frequency at 30,266.64 Hz. What should be my measurement setup of for Time Wave and Spike/gSE? My assessment; Time Wave, 9600 F-max with 1600 lines and Spike/gSE, 3000 Hz. F-max, 3200 lines and a 5KHz. filter. Your assistance with this matter is greatly appreciated. Good day, Charlie
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Re: Recommended Vibe measurements for a high speed air compressor

Shurafa ·
Some of these machines are equipped with relative probes because the bearings are fluid film (journal) type. One may consider different settings for different data collections to have a reliable monitoring. For the similar machines I dealt with, the gears are so reliable and most of our activities are related to the shafts and impellers. But I may be totally wrong as usual. Regards- Ali M. Al-Shurafa
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Re: Recommended Vibe measurements for a high speed air compressor

John from PA ·
Monitoring of mesh frequency at 30 kHz plus is not an easy task. What accelerometer is being used?
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Re: Recommended Vibe measurements for a high speed air compressor

Vibmuthu ·
Is the compressor and gearbox equipped with sleeve bearing or rolling element bearing? If it is sleeve bearing no need to monitor the gSE. For GMF measurement (normal acceleration) 3times of GMF and no of lines should be enough to obtain the running speed sidebands around GMF. Also consider that the sensor and instrument are capable of measuring the fmax. Hope the transducer must be installed by stud mounting. Magnetic base may not be effective measuring >10KHz.
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VI Category II Vibration Analysis Course in Bangalore

Narendra Murthy ·
Category II Vibration Analysts are qualified to perform basic vibration analysis using single-channel instruments according to established procedures, set-up instruments, and maintain a database of results. Minimum Experience Required : 3 years Minimum Training Hours: 38 hours Overview: This course prepares attendees to perform basic machinery vibration analysis on industrial machinery using single-channel measurements, with or without triggers signals, according to established and...
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using thermal camera for thickness measurement??

Ayman Gamal ·
Can we use the thermal imaging camera to measure the thickness of pipe or tank?
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Re: using thermal camera for thickness measurement??

Yousuf Masood ·
No you cant Based on thermal analysis, you can only guess that the pipe/tank is losing thickness due to the presence of hot or cold spots. Ultrasonic thickness testing is widely used in industry to measure thickness of pipes, tanks, conveyor belts and other metallic surfaces.
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Re: using thermal camera for thickness measurement??

Walt Strong ·
" Based on thermal analysis, you can only guess that the pipe/tank is losing thickness due to the presence of hot or cold spots." If there is no insulation that could affect the thermal images, then would a thermal scan save time to locate suspect areas for ultrasound thickness measurement? Walt
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