Tagged With "Apollo Root Cause Analysis"

Topic

Overhung IDF vibration increase gradually

amj.5 ·
Hi every one, An overhung type ID Fan encountered vibration which had been increasing(from 1.8 – ~6 mm/s). So many trials and efforts performed to identify the source of vibration while the fan was running but, unfortunately it was not that...
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Support required in finding RCA of Screw Compressor Rotor Failure

Jahanzeb Dal ·
Hi, we have experienced failure of our air compressor (screw type) male rotor shaft. It sheared off at position adjacent to 90 mm diameter for bearing (NU-318) and 114 mm diameter passing through suction casing. See pictures attached. Rotor failure...
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pump shaft always cracking

Dieu Nguyen ·
Dear all, From 2007 to now, we have 02 pumps always broken shaft at near locking nut. We change size diameter from 22.5mm to 28.5mm but the shaft still crack. (shaft material: SUS 316) Please help us find root cause this problem. Please refer attach...
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Kaiser Screw Compressor axial positioning

electricpete ·
We have a 200hp motor that drives a Kaiser air compressor through a Rexnord Omega coupling. We had an event where something went wrong and some things failed: We found the motor had tripped, the coupling was destroyed (found flexible orange part tore,...
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Burned wound rotor

Lampard Nguyen ·
3 months ago, we had the AC standard testing and PI testing for the wound rotor of the AC 6.6kv, 350kw motor. According to the results of testing, the status of the rotor is very good with IR = 7000 Mohm (insulation corrected resistance), PI=5.66 and...
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Defect elimination process

Josh ·
We are thinking of using defect elimination process to prevent random failures. This is because normal time-based prev maint will only address age-related failures and root cause analysis is reactive in nature ie after the failure happens. Could...
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Motor Current collection settings to get accurate magnitudes

electricpete ·
For current signature analysis, we would like to have accurate magnitudes for purposes of computing db difference between 60hz peak and pole-pass sidebands.. When we set up the collection spec, we were thinking that lots of lines of resolution is good...
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1300 KW Motor axial vibs high in solo condition

Nagaraja ·
Dear members, I am looking into one peculiar problem on one of the 1300 KW stand alone motor. Motor is almost 15 years old. In the past 15 years the motor was taken out, serviced, bearing were replaced several times and put it back for operation...
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High 1X Vibration

Pump Guy ·
I have three pumps, two operate with low vibration amplitudes (0.05 in/s RMS and below), one has high amplitudes (0.18 in/s RMS). High amplitudes were recorded in horizontal directions on both the inboard as well as outboard bearing locations....
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Adding Mass to Blower to correct resonance

MarkSl ·
A customer is having issues with cracks appearing in the pipework flanges in blowers. The blower is direct driven by an foot mounted electric motor. The blower has feet which are not bolted the base it is only retained by the pipework flanges. This is...
Topic

Cooper bearing assembly problem

Danny Harvey ·
I'm attaching some data taken from a newly installed Cooper 02BC515 pillow block bearing on an overhung fan. We reported bpfo with 2 x cage frequency sidebands immediately after start-up. Amplitudes in the TWF were moderate. 1 month later and we are...
Topic

Detecting Bearing Fit Problems

BrianR ·
I am currently working in a Pulp and Paper facility that are struggling with several recent equipment failures on Dryer Section Felt Rolls. Failure analysis has shown that the bearings themselves are not damaged, no inner race, outer race, ball spin...
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machinery "noise" and especially bearing "noise"

Dan Timberlake ·
Maybe it's probably just me, but the description of a bearing as"noisy" does not convey much useful information. There are just too many different noises an unhappy bearing can make to be even remotely sure everyone is "on the same page." That is...
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Is RCM irrelevant in 2015?

AMP Administrator ·
First let me set the record straight – I am huge fan of Reliability Centered Maintenance (RCM - developed 1978 by Nowlan and Heap) to develop an effective maintenance strategy. Second, it seems that in most companies I visit or speak with,...
Topic

Shaft currents or improper bearing selection

Aditya ·
Hi guys, I was recently called in by a client to check an ID Fan motor having repeated bearing failures. The motor is a 4-pole motor driven thru a VFD. Demodulated spectra do not show any defect frequencies, however severe random high frequency...
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Rotor Bar Problem?

SteveG ·
I have a 300 HP Louis Allis AC motor that has Pole Pass frequency sidebands surrounding run speed harmonics, an indicator or rotor problem. We repaired this motor back in October, and no indication of a rotor bar problem was noted. We have the motor...
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Cost effective motor CBM on a big Paper Mill

STORAnders ·
At my Mill we have around 5000 running motors. We have programs in place for root cause elimination, thermography, vibration, automatic diagnostics for control circuits etcera, and we are in a start up phase with ultrasound. BUT for the electrical...
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Root cause of a broken gear shaft

Kevin Ku ·
Hi, one worm gear shaft broken one week ago, see pictures attached. Can anyone give me a clue what might be the cauae from the damaged crosss section? Fatigue, overload or something else. Why? Kevin
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Root cause of a defective gear surface

Kevin Ku ·
One gearbox was rebuild due to oil leak. The gear was noticed with surface damaged all wound contact surface. What could be the root cause via the damaged surface feature attached? Thanks, Kevin
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What method of RCFA are you using for general Rotating Machinery failures

Rick G ·
In the past we have used various root cause methods, but only on high cost/production impact type of failures. For the general low to medium cost failures, no formal process was in place. We are adopting the 5 why method, starting with all pump...
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Condition Monitoring Technician Omaha NE

Dave Reynolds ·
The Walling Company is a Predictive Services provider to various industries, we are currently looking for a multi-skilled technician. The role of this individual is predictive maintenance sales and service. This is an excellent opportunity to work for...
Topic

Taper roller bearing cage defect

Kevin Ku ·
Can anyone tell the possible root cause of cage defect like attached? It's a taper roller bearing used on a reducer output shaft. Damaged only found at one column of cage while all others are OK. Thanks, Kevin Ku.
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Maintenance Coordinator position Holcim Charleston SC

KellyB ·
If you meet the qualifications and want to work for a great company go to the URL below and submit your resume, or you can contact me directly at kelly.broad@holcim.com http://www.recruitingsite.com/csbsites/holcim/en/JobDes...asp?JobNumber=547772...
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Southern IL Reliability Engineer

JBrevard ·
Provide engineering support during turnarounds by managing small projects in the assigned zone and maintaining/ordering critical spares or technical components. Provide detailed engineering support to maintenance so that all work is performed per the...
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Axial Vibration High in Compressor

Gurusamy ·
Dear all In centrifugal compressor ( IR centac) we are facing axial vibration high. The oil pr. 2bar trend maintained..Delta P also Ok. We are getting axial vinb high, what will be the root cause??? Thanks in advance...
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Spectrum data to RMS overall?

Sepski ·
Does anybody have an easy way to convert spectral data (in IPS) to an overall value (also in IPS)? The data were imported into an Excel spreadsheet (unfortunately, not with me right now). I also imported the timewave values (in G's) and was able to...
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Good literature for Beginners

Elias ·
Hi all, I'll break the ice in this section of the forum. The following articles I consider great for beginners:
Topic

Fluctuating 1X peak and phase

Ahmad F ·
This happen at 700MW generator and exciter only, the 1X fluctuating every 50 minute, Any idea? what is the root cause
Topic

Case study - over-greased bearing... with a few twists

electricpete ·
This is a case study with a few twists and turns. The root cause is probably obvious (over-greasing), but the discussion leads to some some questions along the way. Machine Description: This is a 3600 rpm, 100hp horizontal TEFC motor, driving overhung...
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Developement of a RCA Management Policy

Dave Alexander ·
In a quest to develop a comprehensive approach to an effective RCA program I have found numerous books and article on how to perform or application of root cause analysis in all the various methodologies available but limited information on the...
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Capturing Quality History

Rick G ·
In the past (and present) getting the millwrights to provide 'useful' history in the CMMS was a tremendous effort. We were getting info such as 'replaced mechanical seal' as history. We provided the list below of what we feel constitutes good quality...
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Lost production/RCA database

Planty ·
Hi, Is anyone logging their lost production time in a database or spectialist software. We are trying to develope a database system for logging all production loss events. Some of the features we are after are. Fields, Date, Time, Duration, short...
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Centrifugal Compressor Case History

Erik Concha ·
I posted this case history to share my experiences with fellow vibration analyst. This case history uses performance monitoring, process data and shaft vibration to solve a control system issue. It's my opinion that vibration analyst should look...
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The lifeblood of Root Cause Analysis

Rolly12 ·
Dear All, Just thought I share this newsletter I wrote regarding Root Cause Failure Analysis, hope you find them of value. Here is the link : http://www.rsareliability.com/newslettermarch2008issue.htm My Warm Regards,
Topic

what is the difference between root analysis and common analysis

China Girl ·
what is the difference between root analysis and common analysis? I am a Chinses translator and when i met these two terms together in a doc, i did not have any concept about them. Many thanks if any of you could give me some information or examples...
Topic

Root cause at a system level

pippymisty ·
I have recently been part of a team troubleshooting a failure at the system level. We use COTS products in a system that handles/converts/switches electrical signals. Has anyone had experience with this type of RCA? I am new to the COTS and system...
Topic

Screw Pump auger

Santiago71 ·
I have attached a picture of a Screw Pump auger, which had a catastrophic failure few months ago. The root cause of this failure was excessive clearance on the lower bearing, which is sleeve bearing grease lubricated. This pump operates at 25 rpm and...
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Root blowers vibration analysis !

Mohamed Abdul motalib ·
root blowers are very hard to perform vibration analysis on em, does any one have a book or some usefull paper help us for better understanding to these equipments ???
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Discussing " Case of Whirling pump" in UPTIME

David_G ·
There is an article in the Oct/Nov issue of the UPTIME magazine titled "Case of the whirling pump" ( also available on-line ). It has nice ODS still pictures which are also availble as .avi files by request. The paper is trying to convince the reader...
Topic

ROOT BLOWER @ cement plant

Rao Shahbaz ·
hey guyz..can u help me out.actually i have vibropen for nw as i switch here frm SKF.so a root blower we had here.last day it was inspected vibration was upto 22.4mm/sec.with maintenance team, we re-tighten its bolts.And vibration abruptly dropped to...
Topic

backflow on a compressor train

monitor ·
Hello, Any of you dealt with the fenomena of backflow? We where dealing with it. First instance i was was suggesting about a partial radial rub because this was seen in the reversed side of the full spectrum cascade plot. Becoming know of new...
Topic

Creating a Motor Condition Route.

Parrothead ·
Hello. First time poster and I'm so green if you stuck me in the dirt I would take root. My employer is starting a new program and I have been tasked with the US aspect of it. The equipment we have purchased for this is the SDT170MD. Right now I am...
Topic

Setting up Motor Condtion Routes.

Parrothead ·
Hello. First time poster and I'm so green if you stuck me in the dirt I would take root. My employer is starting a new program and I have been tasked with the US aspect of it. The equipment we have purchased for this is the SDT170MD. Right now I am...
Topic

Bearing failure diagnosis.

noisemakr ·
Good Day All, Any thoughts on the primary failure mode of this bearing. My first impression is chemical intrusion due to lack of lubrication. Background; Food processing hammer mill in heavy steam environment, constant load, cooked, softened root...
Topic

Alarn/shutdown criteria for new equipments

Shujaa ·
My concern is about the acceptable, alarm and shutdown vibration limit for new rotating equipment. We are in construction stage for a huge plant and there are so many rotating equipments there. I referred to some international standards that says the...
Topic

sliding bearing parts... too smooth?

electricpete ·
I saw an interesting article on sliding bearings: http://www.machinerylubricatio...il.asp?articleid=638 Failure Analysis for Plain Bearings , by William Strecker, Kingsbury One thing I have never heard before is that a thrust collar (upon which the...
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CSI Spectral Band Overall Amplitudes

Allen Plymon ·
After working with a client on setting up acceptance testing spectral bands, I saw something unusual with regards to the amplitudes generated. In this particular case, the specification called for a 0 - 5000 Hz Fmax. Using digital integration, an...
Topic

need a work in gulf

omar karout ·
Dear all, I am an industrial engineer and have been working in within vibration analysis and condition monitoring for two years. Now the company i am working with went down and unfortunately i am unemployed. I was searching in the past month for a new...
Topic

CSI mathematical procedure

spherical ·
Hello All Forumers, Please see attached file. Accelerometer was used in this measurement. How do CSI processing get it's overall peak velocity value (V-DG)? Is it equal to root square of summation of squares of frequency peaks in the spectrum divided...
Topic

Confusion between RMS and average

abdulbasitb ·
Taking sine wave as example, I understand the difference in definitions as: 1. RMS = 0.707 = root of the mean of squares of actual values 2. Average = 0.637 = average of absolute values However I don't understand that if we construct a graph y=0.637...
 
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