Skip to main content

Asset Condition ManagementPosts About vibration/alignment/balance
Vibration value discrepancy between ADRE and HMI
Registered Member There could be many reasons for amplitude discrepancies. However, I tend to agree with @Registered Member to start by comparing the configurations. Fmin, Fmax, rms, 0-p, type of sensor, power, and scale factor are possible factors to cause discrepancies. I also found very few cases where the rack cards had internal issues. If you have a shaker table or a signal generator, they can be very useful to troubleshoot the case. What do the waveform and spectra contain and are they stable? I guess... [ more ]
Registered Member What is the exact make and model of the accelerometer? Which ADRE are you using; the 408 DSPi or the much older 208P? In the interim, make sure the ADRE and the HMI interface are both configured for the same units. You don't for instance want one configured for RMS and the other PEAK. [ more ]
See all 2 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Rotor bow ge frame 5 gas turbine
Registered Member In my opinion 1 hour may be far too short a time. It could take a day. I've seen results in 4 hours, but if you have the time let it roll. [ more ]
Registered Member We haven't made any inquiry. We just referring to operating manual which mentioned if your shaft suspected to rotor bow , turning at least one hour turning gear . We have done it but vibration has not decreased . Can we conclude bended shaft or permanent bowing ? [ more ]
Registered Member If you have been down since the time this was posted, this would be a cold start. Borescope cannot see all places that the turbine can rub; on gear you may be able to hear a rub--you might go in the exhaust or inlet (if it is not deafining). Not seeing any rubs, is a good sign to place the unit on turning gear (jogging, whaterver you have). (Once someone described to me the rubbing sound on a turbine as whales mating--I wonder how they knew.) You do not have a specific procedure from the... [ more ]
See all 5 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Predictive Equipment Checkout Aid
Registered Member Thank you Mr. John I prefer to not reinvent the proverbial wheel so I will give that a look see. [ more ]
Registered Member You might want to look into getting a copy of API 686 Recommended Practice Machinery Installation and Design. There are machinery commissioning checklists in Chapter 9, although as I look at what I have it is the 1st Edition (April 1996). The 2nd Edition is from December 2009 and it was reaffirmed in November 2014. It's about $200 but it is a very comprehensive document on installation and design. [ more ]
See all 2 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
VFD driven cooling tower fan
Registered Member What is the arrangement of the cooling tower? I have often see the towers utilizing a right angle gearbox have a 1-node torsional around the 10 Hz to 12 Hz region. Noting your comment "The vibration amplitude came down to a normal level after the 2nd VFD replacement", did you see a substantial amplitude change at 900 RPM and or 1100 RPM? If so, a torsional effect may be having some influence. [ more ]
Registered Member More details please: You state high vibration after VFD replacement, then tested at different speeds with same result. Explain please Typically 1x fan/motor speed would increase/decrease with speed change Is position 3 the gearbox input shaft? If so, check the coupling element for damage, check up and down play of input shaft, check gear backlash by rotating driveshaft back and forth, you should barely rotate the shaft and feel the gears making contact. What is the frequency of the sidebands... [ more ]
See all 2 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Large generator turbine brush vibration
Registered Member It doesn't directly address how to measure brush vibration, but probably worth reading. Maintaining carbon-brush collectors [ more ]
See 1 reply...

Share This Post

Employment OpportunitiesReliabilityResumes
Fullstack developer for condition monitoring

Share This Post

Reliability Engineering for MaintenancePosts about Reliability Engineering for Maintenance
Availability vs MTBF

Share This Post

Welcome to AMPForum help
3 phase wire color code
Registered Member Asked a Journeyman Industrial Electrician and he said it depends, but usually black, red, blue. My current instructor at tech school is a Master Electrician and he says it's black, red, blue. I'm going with that... [ more ]
See 1 reply...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Sub-Synchronous Vibration (1 - 2 Hz) problem. Electrical noise or Fluid Instability? HELP!
Registered Member The time waveform looks to have a transient at the start of data collection. The meaning of the spectrum is questionable because of this. Does this repeat? With other data? There could be a number of causes. One is a sudden application of the transducer concurrent to the start of data collection. Don't be too quick to collect data after placing the transducer. [ more ]
Registered Member Can you elaborate on what you are referring to when you say β€œvibration transmitter”? Are you truly using a transmitter or are you using a proximitor wired back to a rack? Perhaps add make and model. [ more ]
Registered Member Yeah, I think the problem is more about noise but instrumentation personnel has replaced cables, sensor, vibration transmitter and the problem still continues. The barrier was also eliminated. [ more ]
See all 8 replies...

Share This Post

Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil level fluctuates in bearing housing
Registered Member Blocked/partially blocked vent in sight glass or bearing housing, small hole at top of sight glass must be clear for gauge to work correctly, see image Air seals on bearing housings are dirty where shaft enters/exits the bearing housing Oil ring not turning all the time Dirt moving around inside of housing blocking oil to sight glass All can cause oil level to fluctuate Dave [ more ]
See 1 reply...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Turbine journal bearing High temperature
Registered Member I dont have extensive field experience with gas turbines (others on this forum do), but it seems to me that the orbit displays you provided shows a very high preload in the horizontal direction <--- assuming the 0 deg reference is the top/vertical direction. Do you have orbits and vibration data from before recent inspection for comparison? Orbit shapes will change with speed (and perhaps load) due to the accompanying dynamic stiffness changes. It would be nice to plot these various... [ more ]
Registered Member hello Mr Jim thank you , in above my answer for your question. attached is the alignment report. Regrads [ more ]
Registered Member Am a bit confused....you say X and Y radial plan(e) but axial proximiter? Can you confirm we are talking radial measurements or axial "thrust" measurements On initial glance, this data appears to show your orbit shaft highly preloaded in 0-180 deg direction. Not sure how you set up your probes so I am assuming the horizontal direction. Since you state it was only an inspection, I would assume no work was done to it? yes/no? I would check carefully how you replaced the bearing after... [ more ]
See all 3 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Pfaudler Gearboxes fault frequencies
Registered Member Contacted the number provided and spoke with the service manager. Found out that the individual that I had previously spoken with works in her group. More to follow..... [ more ]
Registered Member I’d call the number I previously provided and ask to speak specifically to the service manager. [ more ]
Registered Member Thank you Mr. John. To be honest I am not sure where the gentleman is out of that I was speaking and am in email contact with. I was given his name and contact information by a Field Service Coordinator from GMM Pfaudler US. [ more ]
See all 4 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Marley 2200 gear reducer GMF
Registered Member Thanks for your help [ more ]
Registered Member Something wrong…1457/210 = 6.938 but up front you said the ratio is 6.12:1. Verify the speeds, confirm this is a single reduction and see if you can get any info that would confirm seven teeth on the pinion. [ more ]
Registered Member This is a spiral bevel. Output speed appears to be about 210 rpm. [ more ]
See all 6 replies...

Share This Post

Welcome to AMPBook and Article Discussions
New Book on Rotating Machinery Reliability for Engineers and Technicians
Registered Member Thank you! [ more ]
Registered Member Congratulation Ron [ more ]
See all 2 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
Looking for Electric Pete (Mr. Peter Schimpf
Registered Member He finally replied. He’s fine!!! [ more ]
Registered Member I haven't seen him around here lately, he posted at the machinery analysis forum, he also was very active at eng-tips Congratulations on the book [ more ]
See all 2 replies...

Share This Post

Reliability Engineering for MaintenancePosts about Root Cause Analysis
roots blower
Registered Member This is positive displacement blower. If no rubbing in the machine and motor also is good, then the most likely thing is a clogged suction / discharge line which is causing high load. Is It possible that any valve on the lines is not opened ? Maybe could you try to start the blower after disconnecting the discharge line ( removing expansion joint at blower outlet) to identity the real cause. Thanks. [ more ]
Registered Member Very little details to help troubleshoot, changing blower bearings, positive displacement roots type blower correct? Is the motor connected proper for the voltage you are supplying to it, you state motor amps are high and not getting up to speed is an indication of wrong motor connection or shorted windings, you most likely will want to double check this. All three phases have balance voltage and current? https://electricmotorwarehouse...connection-diagrams/ Mechanical drag, rubbing rotors,... [ more ]
Registered Member dear Dave we check everything as you described and did not find anything wrong any advice can you help me with (We tried to operate the blower and get the same resalt) [ more ]
See all 5 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
CSi 2120 serial number
Registered Member Hi, I worked it out. Serial number in the firmware .tsk file 000000 is the DEBUG firmware which when loaded shows the real serial number. [ more ]
See 1 reply...

Share This Post

Reliability Engineering for MaintenancePosts about Root Cause Analysis
Bearing analysis RCA
Registered Member Hello, does everyone agree on this assessment? any additional guideline that can be provided? Thanks! [ more ]
Registered Member Thank you Becar for the support! really appreciated. I was mentioning it due to the fact that most of the pictures you can see are related to ball bearing and in this case it is a cylindrical roller bearing, so not sure about the patterns. I have also read that there are different stages for it: pitting, frosting and flutting. How could I determine if this can be initial pitting? as per the picture #1 I provided at the start of the discussion, to me it doesnt look like pitting as does not... [ more ]
Registered Member Just type on google ˝electrical fluting˝, you will see very typical pattern. In your case it could also be just wearness after reaching life cycle of the bearing. [ more ]
See all 12 replies...

Share This Post

Asset Condition ManagementPosts About vibration/alignment/balance
1x High Vibration NDE Motor
Registered Member Why use peak hold averages spectrums if you can make waterfall plots, in my opinion 1000hz 400 lines will give you a very fast spectrum and any other harmonics will rise at a resonance "zone" which will give you a better confirmation of resonance Agree with Ralph, phase at feet and what's this motor driving, motor - gearbox - rollers for a pellet press, how is the feeding "controlled" more material will slow down the motor (increased load) once the motor is free it will spin a little faster,... [ more ]
Registered Member Thanks James. This is sort of strange for there to be sidebands off the 1x at such a CLOSE distance........ What is the motor driving, a gearbox? and what is the final rpm of the driven part? If agitator, what is its rpm snd how many blades or paddles? Ralph [ more ]
Registered Member Thanks James, One more question. See the attached doc file questions. Ralph [ more ]
See all 17 replies...

Share This Post

Reliability Engineering for MaintenancePosts about Reliability Engineering for Maintenance
Pump extension box water jacket.
Registered Member https://www.pumpsandsystems.co...what-next-generation https://www.enviroseal.ca/spiraltrac/seal Some pics of what you are seeing would help. There are options to resolve this issue, the above links are some solutions in different pumping applications. Is this a mechanical seal? Packing? what is plugging? What are you pumping? Dave [ more ]
Registered Member This is a boiler feed water pump, an Ingersoll Rand 5HTMA. The stuffing box extension is where the packing is, and it is the purge water porting that is blocked. [ more ]
Registered Member Are you referring to mechanical seal area of your pump? Make, model, product being pumped? Dave [ more ]
See all 3 replies...

Share This Post

Join Us!

The Association for Asset Management Professionals (AMP) is dedicated to making the world work for everyone, with no one left behind.

The mission is to provide a path to a safe, sustainable, successful workplace and world through reliability and asset management.

AMP is a Florida based 501 (C3) not-for-profit organization that delivers

  • Professional Certification (CRL and CMM)
  • Online Community of Knowledge
  • Competency Based Learning (CBL)
  • virtual Special Interest Groups (vSIG)


 This web site is FREE to use for registered members and has been called the LinkedIn or Facebook for Reliability Leaders and Asset Managers.  The Community of Knowledge is simply fantastic.

The Association of Asset Management Professionals (AMP) is licensed to develop competency based frameworks using Uptime Elements Reliability Framework and Asset Management System and its related Frameworks.

Uptime Elements Reliability Framework and Asset Management System
Uptime Elements Reliability Framework and Asset Management System

Uptime Elements Digitalization Framework
IoT Knowledge Domain

Vibration Elements
Vibration Analysis and Diagnostic Framework
Lubrication Elements
Asset Lubrication Framework

 You are also invited to join the Association of Asset Management Professionals

LinkedIn Discussion Group with 53.000+ members

https://www.linkedin.com/groups/1636387

LinkedIn Company Page as well
https://www.linkedin.com/company/association-of-asset-management-professionals

Join Now

Already a member? Sign In

Upcoming Events

VIRTUAL CMM EXAM
VIRTUAL CRL EXAM

Complete Calendar

Online Now

×
×
×
×
Link copied to your clipboard.
×