Availability: The percentage of time that the asset is actually operating compared to when it is scheduled to operate. (SMRP Best Practices 4th Edition Section 2.2)
Unscheduled Downtime: The amount of time an asset is not capable of running due to unscheduled repairs, i.e. repairs not on the finalized weekly maintenance schedule. (SMRP Best Practices 4th Edition Section 3.4)
It should be noted that the calculation for unscheduled downtime only includes REACTIVE work. (MRCT Work Orders/CM Tasks.) Even if, in the Portal under Malfunctions, the task is marked Breakdown = Yes, if the task type is not CM, it will not show as Unscheduled Downtime.
Scheduled Downtime: The amount of time an asset is not capable of running due to scheduled work, i.e. work that is on the finalized weekly maintenance schedule. (SMRP Best Practices 4th Edition Section 3.3)
The measurement of Availability 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 Availability 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 Availability percentage along with the sum of Unscheduled and Scheduled downtime in hours by month for the past 13 months.
The Pareto Chart displays the top assets having the most hours of downtime 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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