Mean Time Between Failure: The average length of operating time between failures and is used to assess the reliability of a repairable asset. Reliability is usually expressed as the probability that an asset or component will perform its intended function without failure for a specified period under specified conditions. (SMRP Best Practices 4th Edition Section 3.5.1)
The measurement of MTBF performance in hours is calculated by the following formula:
This metric assumes a reasonably stable operational schedule, so it is the Site’s responsibility to ensure that this metric accurately reflects MTBF by ensuring that the actual production hours are used for this calculation. The production hours should be updated weekly to reflect any significant changes to the production schedule such as down days or holidays.
The Trend Chart displays the Mean Time Between Failure percentage and the number of Failures by month for the past 13 months.
The Pareto Chart displays the top assets having the worst MTBF during the previous 6-month period. Assets listed on the Pareto chart may be good candidates to perform additional analysis to determine the types and magnitude of the failures that are occurring. Look for repeat failures to target Root Cause Analysis efforts toward improving this metric.
This standard chart will also have a section for action items. This section will identify the actions, owners, and due dates for action plans that will be executed to improve performance. The development of the action item section should be coordinated by the P/S and jointly developed by the Team Leads, Site Supervisors, and the Site Manager. The Site Manager is ultimately responsible for the completion, quality, and conformance to the action items identified.
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