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Reply from jc_plummer on Jul 29 at 1:09 AM Generally, MTTR is effective outage time in hours divided by the number of effective outages and MTBR is the effective time in hours between outages divided by the number of effective outages. We would need to know how many hours per shift to calculate your number. (Keep in mind, SAP standard reports yield MTBR, not MTBF per se) An example From SAP:
The following example shows how the MTBR is calculated:
Acquisition date of pump A 01/01/94
First breakdown 01/10/94
Downtime 10 hours
Second breakdown 01/20/94
Downtime 5 hours
Number of breakdowns 2
(The parenthesis, asterisk, slashes, etc. may not reproduce correctly below after posting)
MTBR = (19 * 24 - 10) / 2 or X + Y (St) / 2
= (456 - 10) / 2 or (216 + 240 - 10) / 2
= 223 hours
Nineteen days times twenty four hours, minus 10 hours, quantity divided by two.
I hope this helps. Cheers! Jeff
| | | ---------------Original Message---------------
From: baldev
Sent: Saturday, July 19, 2014 7:35 AM
Subject: Formula for MTBF for a Single Asset in Days
How to claculate MTBF for a single machine in days if machine runs 74 shift in a month and down time in nos are 2 nos and hrs is 1.16 hrs |
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