Reliability is a measure of a refiner’s ability to keep the equipment available for use by maintaining mechanical integrity. In general, this means minimizing the time that process units are out of service, especially from unplanned outages.

The primary measures of reliability are:

  • Mechanical availability – This is a measure of the proportion of time that a process unit is mechanically capable of running (irrespective of whether it actually is running). Generally, this is measured as a percent of unit capacity
  • Unplanned downtime – This is a measure of either the frequency or duration of unit outages. For example, 3 times per year or 20% of the time

The Refinery Reference Desk includes content derived from our industry experts as well as from public data sources such as company websites. Nothing herein is intended to serve as investment advice. This material is based on information that we believe to be reliable and adequately comprehensive, but we do not represent that such information is in all respects accurate or complete. McKinsey Energy Insights does not accept any liability for any losses resulting from use of the content.

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