maintenance cost x reliability improving
maintenance cost x reliability improving
(OP)
I work in a oil industry and would like to connect reliability and cost of maintenance. How can I make a link between increasing reliability and the cost associated with maintenance (Corrective x Preventive)?
How to improve the time of preventive maintenance (PM)?
As exemple:
Failure history (25 failures / 3 ) 2p-Weibull beta = 2.22 / eta= 1600
Cost PM= 2700.00
Cost CM= 8600.00
How to improve the time of preventive maintenance (PM)?
As exemple:
Failure history (25 failures / 3 ) 2p-Weibull beta = 2.22 / eta= 1600
Cost PM= 2700.00
Cost CM= 8600.00





RE: maintenance cost x reliability improving
Some considerations:
If it fails, does the whole process or plant go down? What is the lost $ for every hour it is broken? How long does it take to fix?
How much is PM costing? What are you actually doing in the PM?
Regarding PM frequency:
- For some things (vessels, etc) a RBI (risk based inspection) program can help set the inspection intervals.
- Other times they are driven by code (i.e. relief valves need testing every X years).
- What are your failure modes? What PM or inspections can actually be done to catch/prevent issues and what do those cost? Example: if you have pitting corrosion in piping then doing a UT (thickness check) isn't going to necessarily help, even if you do it every single day.
- Do you have historical data? What is the MTBF? Do your PM at such an interval that you don't approach the majority of the distribution curve.
RE: maintenance cost x reliability improving
See some references:
https://library.e.abb.com/public/f774fb4c67beea60c...
http://www.energy.alberta.ca/CCS/RAMFinalReport.pd...
http://www.gasprocessingnews.com/features/201504/u...
Dejan IVANOVIC
Process Engineer, MSChE
RE: maintenance cost x reliability improving
RE: maintenance cost x reliability improving
cost of current repairs vs. non-recurring cost for redesign + new cost of repairs
If the former is greater by a sufficient margin, over life, then you can argue for making the change. If the latter is greater, then you stay with the current situation. Longevity also factors into the mix.
TTFN
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RE: maintenance cost x reliability improving
Dejan IVANOVIC
Process Engineer, MSChE
RE: maintenance cost x reliability improving
I am not a fan of economic based decision maintainence criteria. You need maintenance to keep something running at an acceptable level. Define that level and you know how much maintenance is required then the cost falls out of that. I don't like arguing with the accountants. My advantage is that they can't argue design and maintenance criteria, so they are left screaming only about how much is in the bank. Plus they take the hit if, God forbid, something happens.
RE: maintenance cost x reliability improving
TTFN
I can do absolutely anything. I'm an expert!
homework forum: //www.engineering.com/AskForum/aff/32.aspx
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: maintenance cost x reliability improving
A similar example is the B-52 nuclear fleet, where planes that were originally built in the 1940s and 1950s are still flying, with pretty much every component having been replaced at least once. Since the electronics and guidance were extremely antiquated, by today's standards, there have also been serious upgrades for GPS, etc.
TTFN
I can do absolutely anything. I'm an expert!
homework forum: //www.engineering.com/AskForum/aff/32.aspx
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: maintenance cost x reliability improving