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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Ray V. Steele (rsteele@ebaratech.com )
Organization:Ebara Technologies, Inc.
Date posted: Thu Aug 24 16:47:30 US/Eastern 2000
Subject: Equipment Reliability Database
Message:
I have been asked to develop a database to monitor many pieces of equipment at our facility. These would include a number of air conditioners, compressors, cnc machinery, etc. All of this equipment has been online for a number of years. What suggestions might anyone have with regard to types of useful data to collect? Can MTBF and MTTR be calculated on this equipment? If not, what would be useful? Thanks in advance for your help - Ray


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Subject: Re: Equipment Reliability Database
Reply Posted by: Marina Karyagina
Date Posted: Wed Sep 13 22:56:22 US/Eastern 2000
Message:
One usually first decides on the objective of data collection - then you would know what information to collect. if you are interested in improving reliability of equipment at your facility with the objective of reducing cost of maintenance have a look at some off-the-shelf computerised maintenance management systems (CMMS). There are some quite sophisticated, easy to use and inexpensive packages available. Information usually stored/collected by these packages are: -equipment register (the list of your equipment with equipment numbers and locations, technical data ect.); -routine maintenance actions for each piece of equipment; -equipment failures and repair actions (usually captured through work orders) and much more; Failures can be classified in different categories (electrical, mechanical etc.), failure causes can be recorded and repair actions taken to restore the equipment. Main information collected for repair actions and preventative maintenance actions are materials used, labour hours spent, total downtime etc. so that one can calculate maintenance costs and cost of downtime. You might want to collect hours run for each equipment, but if equipment is used pretty regularly then calender hours will do. my personal view is that looking into the root causes of significant failures (that is failures which have high repair/downtime costs) is more important than compiling MTBFs/MTTRs.


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