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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Verifying oil recommendations for vertical pump motor

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Asset Condition ManagementPosts About vibration/alignment/balance
Standard query ANSI/ASA S2.75 alignment
Registered Member Might be of interest; https://oaktrust.library.tamu....ce=1&isAllowed=y [ more ]
Registered Member These are "different alignments" With a spacer shaft (CML) as in your document, there are two flexible planes, the spacer shaft (CML, middle shaft) splits the angle between the shafts (driver and drivem) in two, the tolerance between shafts (driver and driven) is twice as much when compared to a simple coupling (pin-bush, gear, grill, etc) at each flexible plane the offset between the spacer and shaft (driver or driven) is zero, therefore you only have one angle tolerance at each of this... [ more ]
Registered Member I would be using the distance between the teeth on the two hubs. [ more ]
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Welcome to AMPForum help
Wrong Display Menu Scaling Edit Manual Scale - Shaft Centerline Plots ADRE SXP ver 3.22.6800

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Asset Condition ManagementPosts About vibration/alignment/balance
Feedwater Pump High Vibration at Partial Load Range
Registered Member To add more clarity (I hope ) and to be more specific: 1. No, I have not heard of a situation like this before. Typical problems with a recirc line occur when we deviate far from the BEP....which I am sure you are already aware. Most of the problems I have seen are at one extreme or the other and not at partial recirc flow as you indicate. ASSUMING a good design up front; hence my asking about whether it was always like this or something new, perhaps changes to the flow path. 2. I did have... [ more ]
Registered Member Your statement, "Vibration is normal at low load - when Automatic Recirculation Valve (ARV) is close and at full load - when ARV is fully open" , is confusing. Let's change this discussion from "load" to "flow" and show us what this means on the pump's head curve which will be much more useful and informative. It would also be helpful to the members here if you can provide background information (e.g. Has this issue always been a problem? <--suggesting a design issue OR something that... [ more ]
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Reliability Engineering for MaintenancePosts about Reliability Engineering for Maintenance
CSI 2140 and Report Writing

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Asset Condition ManagementPosts About vibration/alignment/balance
Motor High vibration 1X
Registered Member Ramanathan, Thanks for the reply. Based on the data you posted, quote: "We found in the FFT 1X with pole pass frequency side band (amplitude 0.37 mm/sec RMS) in the motor and I zoomed the 90 to 120 order 2xRBPF frequency with 2 line frequency and found 675 cpm(0.375X )side band in the mentioned frequencies." sounds like you may have a rotor with rotor bar problems, if the frequency of these " pole pass " sidebands you are referring to, are equal to the number of poles times the slip... [ more ]
Registered Member Thanks for for reply Mr. Ralph, We found in the FFT 1X with pole pass frequency side band (amplitude 0.37 mm/sec RMS) in the motor and I zoomed the 90 to 120 order 2xRBPF frequency with 2 line frequency and found 675 cpm(0.375X )side band in the mentioned frequencies. Thanks RS [ more ]
Registered Member Ramanthan, Can you take a high resolution (6400 lines) spectrum from, 0 to 120 orders and zoom in from 0 to 10 orders, and also zoom in on the data from, 90 to 120 orders and measure the sidebands, if any exists, in these 2 areas, not displaced in orders, but displayed in Hz? Thanks, Ralph [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
3X DOMINANT PEAK (ONLY 3X) IN BOTH MOTOR AND FAN BEARINGS
Registered Member You should study your fan laws! Check β€œLaw 3” at https://eldridgeusa.com/blog/u...he-3-basic-fan-laws/ [ more ]
Registered Member It seems to be speed related, get those plots and come back. [ more ]
Registered Member @Registered Member no phase data taken. Neither check any bode plots [ more ]
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Welcome to AMPForum help
Hydrogen Cooled Generator - Symptoms: H2 Loss & Elevated Vibration

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Asset Condition ManagementPosts About vibration/alignment/balance
Misalignment and bearing damage

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Asset Condition ManagementPosts About vibration/alignment/balance
accelerometer in rotating disc perimeter
Registered Member interesting Walt, for sure another mass 180 degrees apart is necessary to cancel the unbalance of the sensor Then you answered one of my concerns. Setting up the sensor in the rotary part perimeter, tangential, axial and radial for the triaxial sensor, it is possible to still read an amplitude and phase value and perform a balancing. I will take in mind and try to do if I have the opportunity i thought, beeing the unbalance 1x synchronous component and with a constant rotating speed (no... [ more ]
Registered Member My understanding is that two tangential accelerometers, 180-degrees apart, are needed to cancel (by subtraction) the lateral motion from pure torsional motion. I would be more convinced with the Erbessed-Instrument "experiment" if another direct measure of torsional vibration was used for comparison. Perhaps for that experiment the torsional motion was dominant compared to lateral motion. I use the optical encoder method (located for high torsional displacement/velocity) and the Binsfeld... [ more ]
Registered Member thanks! so, I would measure torsional vibrations by placing the accelerometer in an eccentric position... [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
High axial vibration in a centrifugal fan
Registered Member Strange; 9 mm/sec is 10 divisions? Why not 9 divisions? [ more ]
Registered Member Hi John, that's 9 mm/s RMS, values at discrete frequencies can be roughly estimated from this value. [ more ]
Registered Member Why is vertical scale labeled "9" at top left and have 10 divisions? [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
EMERSON CSI 2140 WATERFALL
Registered Member You can choose the axis units either speed or orders, in VA tab just right click the axis or plot, if using plot data is somewhere but can't remember [ more ]
Registered Member Sounds like what you want is what is termed a cascade plot. I'm not into Emerson/CSI equipment but the video at Collect Cascade Measurements might be of help. [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
Vibration limits for centrifugal fan
Registered Member That fan category is BV-3 and in the limits chart it is suggested "See ISO 10816-3". When you go to that specification, specifically section 5, the logic behind setting limits is discussed extensively. At least that is true in the version I have, the 1st edition dated 1998-05-15. You'll find that many of the "steps" build on a 25% factor. [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
Emerson Class Textbooks

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Asset Condition ManagementPosts About vibration/alignment/balance
High vibration at 1Γ—BPFI at Motor DE Axial during no load condition
Registered Member thank you @Registered Member, @Registered Member for valuable comment and sorry for late reply. in continuation with above problem we have taken motor solo run trial (Without pump coupled) on 25.04.2022 and then coupled with pump. Overall vibration again increased drastically on motor both end in axial direction at 1X and 2X. interestingly without any work done and without pump stoppage this vibration again reduced with dominant peak at around 12K CPM at motor NDE axial and at 14560 CPM at... [ more ]
Registered Member "I am still wondering why this does not excite 1X vibration ?" Perhaps just a misunderstanding of terminology. Vibration at 1xSS is the result of an excitation force such as rotor unbalance or shaft misalignment. The foundation does not excite vibration, but it can amplify the vibration response. Several factors with the "loose motor base" can occur, such as change in natural frequency, change in damping, change in vibration transfer from motor frame into foundation, change in hammer contact... [ more ]
Registered Member You might want to acquaint yourself with the paper at UNDERSTANDING THE VIBRATION FORCES IN INDUCTION MOTORS by Michael J. Costello and/or Troubleshooting Electric Motors by William R. Finley . [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
2140 balancing issue
Registered Member Check the RPM using the rpm option from analyze mode, it will show the FFT of the tech pulse, change the plot type it will show you the time waveform of the tech pulse, look at the volt peak level and adjust the trigger accordingly, default trigger is 2 volts and it is correct for photo tech, speed vue works with a different way, and can change the trigger point/location/phase angle if the shaft has more reflection/scratches. I suggest changing the trigger level to 4 volts for the peak vue... [ more ]
Registered Member Afaik peakvue send an analog output that depends on external factors therefore there's no trigger level for all conditions. [ more ]
Registered Member It was the trigger level. Never had to raise it that high in the past. Not sure what changed, but something did. [ more ]
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Asset Condition ManagementPosts About Motor Testing
Electric Motor RPM drop
Registered Member I think the possibilities in order of likelihood are: 1. Miswired motor (makes the effective voltage lower). If the motor is supposed to be run in delta and you have it running in wye, then it will see sqrt(3) less voltage on the windings and it will develope a factor of 3 less torque, which may allow it to stall at a lower speed and possibly not trip on overloads. (Obvious way to investigate that: was the motor worked on since the last time you checked speed?) 2. Does the motor have a vfd... [ more ]
Registered Member Change in VFD output to motor, motor shorted phase to phase, broken rotor bars, motor connected incorrectly, two speed motor, all can cause the motor to "slow down". You provide no details of your application to go any further..... Dave [ more ]
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Work Execution ManagementPosts About Maintenance Planning & Scheduling
Break-in Jobs or Un-planned Jobs
Registered Member https://www.worldclassplanning...tenance-kpi-metrics/ https://www.upkeep.com/downloa...nce-metrics-and-kpis http://www.plant-maintenance.com/downloads/KPI.pdf Please find these links as points of reference Dave [ more ]
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Asset Condition ManagementPosts About vibration/alignment/balance
SKF @ptitude

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