Query for Maintenance
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- This topic has 19 replies, 19 voices, and was last updated 14 years, 6 months ago by
Arvind Sharma.
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March 21, 2006 at 2:33 pm #42802
Sanjay JoshiMember@Sanjay-JoshiInclude @Sanjay-Joshi in your post and this person will
be notified via email.Hi All,
I do not know whether this is right platform to ask this question or not, but still if any one has answer to this kindly help.
When we calculate Mean Time Between Repairs(MTBR) for a Machine, it may happen that the Fault that happened now was different from the past date fault (For Example this time machine fuse blew off but last time the foundation bolt broke) so the time taken to repair these faults wont be same. Hence if i calculate the MTBR this wont show me the correct mean times.
can anyone suggest a way to calculate the MTBR for different types of faults occuring on the same machine.0March 21, 2006 at 4:11 pm #135300
Anshul KaroliwalParticipant@Anshul-KaroliwalInclude @Anshul-Karoliwal in your post and this person will
be notified via email.It depends on your project.
There can be many ways to look at MTBR.
Eg.
1) MTBR per fault type – Various machines having same fault.
2) MTBR per machine type – All machines of same make and type.0March 21, 2006 at 4:53 pm #135303
Paul GibbonsParticipant@Paul-GibbonsInclude @Paul-Gibbons in your post and this person will
be notified via email.Hi Sanjay,
My suggestion to you would be to forget about the MTBF and look at the Mean Time To Repair (MTTR) and the Mean Time To Failure (MTTF) both of which can be combined to claculate the MTBF should you so wish.
From the MTTF you can see how effective your maintenance strategy is as a reliability KPI. From the MTTR you can see how effective your maintenance strategy is a maintainability KPI.
I have experience a similar problem to the one you have described and this is what I did……
Reliability modelling of groups of plant using the MTTF and MTTR data highlighted 4 machines that were critical to the business and not performing well. A review of the raw data informing the MTTR suggested a range of repair times between 20 and 9000 minutes. This suggested more than one failure mode existed and so further analysis was required. Using the Mean Rank Weibull analysis I plotted the ranked repair times on 3 decade Weibull paper. From the plot I could clearly see 3 distinct modes of failure.
Taking the analyis further I carried out the median rank failure mode specific Weibull Analysis replotting the individual failure modes on 2 decade Weibull paper. From each plot I could see the Beta value and in this case the first two plots indicated normal wear out phase and the last plot indicated random failure.
Checking the maintenance records I summarised the three separate modes of maintenance failure into the following categories:
Mode 1 Minor stops for resetting alarms and changing fuses
Mode 2 External repairs such as heater band changes and minor internal repairs such as injection screw smear head replcement.
Mode 3 Major internal repairs such as injection screw breakage in barrel.
Finally I calculated the financial cost of the failure modes identifying the focus for improvement within the overall maintenance strategy. In this case it was failure mode 3 which I calculated had cost £300k as apposed to failure mode 1 which I calculated had cost only £5k.
I have the full Reliability, Availability, Maintainability & Safety (‘RAMS’) study written up as a Word file (although the Weibulls are ‘handraulic’ so you can’t see them on the word doc) if you want a copy post your email and I will send it to you.
Good luck and if you need any advice on improving you maintenance engineering post a question and I will try and help.
Paul0March 22, 2006 at 10:50 am #135337
Sanjay JoshiMember@Sanjay-JoshiInclude @Sanjay-Joshi in your post and this person will
be notified via email.Thanks Paul,
Thanks for your valuable suggestion.
It would be of real help if you can send me the word document.My email id is [email protected]
Regards,
Sanjay Joshi
0March 27, 2006 at 6:28 am #135504Hello Paul,
Would appreciate if you could send me the word document too.
My e-mail id is [email protected]
Thanks, Krithish0March 27, 2006 at 8:01 am #135505Paul,
Your reply to the post was very intresting, You seem to be a Guru in the Subject matter.
Hari
0March 27, 2006 at 8:01 am #135506
L B SubrahmanyamParticipant@L-B-SubrahmanyamInclude @L-B-Subrahmanyam in your post and this person will
be notified via email.Hi Mr. Paul,
Please send me the word document to following mail
[email protected]
Thanks
LBS
0March 27, 2006 at 11:25 am #135513
Manish KumarParticipant@Manish-KumarInclude @Manish-Kumar in your post and this person will
be notified via email.Hi, Paul
Your analysis is very objective and concluding. We have also started monitoring MTBF and will start TPM initiative shortly. I would be thank if you could send me the word documents too. My email is [email protected].
Regards
Manish Kumar0March 27, 2006 at 1:15 pm #135517Hi,
Could i have a copy of the word document too, please? My email id is [email protected]
Thanks
R0March 27, 2006 at 2:09 pm #135519Hello Paul
I’ll appreciate it if you can provide me with the word document!.
My e-mail is: [email protected]
Thanks0March 27, 2006 at 2:28 pm #135521
WMatwijecMember@WMatwijecInclude @WMatwijec in your post and this person will
be notified via email.Paul I would also be interested in your word doc.Walt
MNAA
Nashville Airport0March 27, 2006 at 6:07 pm #135527
CurielParticipant@EnriqueInclude @Enrique in your post and this person will
be notified via email.Paul
I would appreciate if you could send me the word document to my e-mail
[email protected]
Thanks
Enrique0March 27, 2006 at 11:56 pm #135547Paul,
I would appreciate if you can send me a copy of the document to my e-mail
[email protected]
regards
Cruz0March 28, 2006 at 4:20 am #135553Hello Paul
I’ll appreciate it if you can provide me with the word document!.
My e-mail is: [email protected]0March 28, 2006 at 5:18 am #135554
Nadir Minoo PatelParticipant@nadir-minoo-patelInclude @nadir-minoo-patel in your post and this person will
be notified via email.Hello Paul,
Enjoyed your simple straight forward methodology. Would appreciate if you can forward that “word” document to me at: [email protected]
Regards
nader0March 28, 2006 at 4:45 pm #135565
GreensteinParticipant@JeffreyInclude @Jeffrey in your post and this person will
be notified via email.Hi Paul,
Could you send me a copy of your study as well?
[email protected]
Thanks
Jeffrey0March 28, 2006 at 8:34 pm #135575Paul,
My I have a copy of the Word document as well.
My email is [email protected]
Thank you so much.
Stan0March 29, 2006 at 12:59 pm #135606Hi Sanjay!
I totally agrree with Paul’s approximation. The best way is the using of Weibull distribution. Check this link to know more about Weibull’s strategy. It is my favorite software for maintenace issues.
Csaba
http://www.weibullnews.com0October 23, 2006 at 5:15 pm #145512
Fabio PaivaParticipant@Fabio-PaivaInclude @Fabio-Paiva in your post and this person will
be notified via email.Paul,
Thanks for your suggestion.
It would be of real help if you can send me the word document.My email id is fabio.paivacomau.com.br
Regards,
Fábio Paiva0January 1, 2008 at 2:42 pm #166671
Arvind SharmaParticipant@Arvind-SharmaInclude @Arvind-Sharma in your post and this person will
be notified via email.Dear Paul ,
Greetings and Happy New Year .
I am new to SS , and a Finance professional working out of India .
I have been assigned a project on Reducing the Machinery Downtime , which is a perennial problem in our organisation .
I am trying to learn as much as I can on how to proceed on this project .Seeing your messages on the this issue and replies to various queries , you can help me by downloading your experience on this and guide me along .
Can you please send me this word document , and any other basic written material you have on this subject .
I consider you my MBB on this issue !!!!
Please help
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