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Variable Interval

One of a variety of different types of intervals (time periods) between events.

In time-based maintenance (TbM), this is a defined frequency (interval) for maintenance activities defined by performance criteria rather than fixed intervals of time. 

The performance criteria include events and circumstances such as:


Examples
Listed below are some examples of maintenance tasks presented as variable interval activities: 

  • “Inspect roof drains after each rainfall”.
  • "Check generator fuel levels after each power outage".

Management Principles
Variable intervals can be presented with the following attributes:
  • With or without escalation.
  • Overlapping with other intervals.
Variables intervals with escalation
Fig. Variable interval events with escalation represented on a cost graph.


Major maintenance tasks (shown in "orange") for preservation of a capital asset until the it reaches the end of its useful service life and must be renewd.
Fig. Major maintenance tasks (shown in "orange") carried out at variable intervals for preservation of a capital asset until it reaches the end of its useful service life and must be renewed ("yellow" bar").



Variable interval events mapped onto the P-F curve to illustrate the relationship between time and condition.
Fig. Variable interval events mapped onto the P-F curve to illustrate the relationship between time and condition.

See also:
Compare with:


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