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Intervals

Sometimes also referred to as the "frequency" of an event. 

The period of time between events (typically when referring to future events), such as maintenance and/or renewal events, regarding either an asset, a system or a building. 

Interval diagrams can be mapped along planning horizons or along deterioration curves.


Measuring Intervals

  • Fuel consumption`
  • Service hours
  • Calendar Time

Types of Intervals

It is generally recognized in the asset management literature that there are four broad classes of intervals, summarized as follows:

Listed below is a more thorough list of the various nuanced types of intervals that belong to each of the four classes:

      1.  Fixed
      2.  Variable       3.  Single       4.  Multiple

 1    fixed interval events mapped onto the P-F curve to illustrate the relationship between time and resistance to failure
Fig. Two primary methods of displaying intervals: a) along a planning horizon and b) along a deterioration curve.


single event
Fig 1.  Single Interval (one-time) event

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Fig 2. Fixed intervals - uniform

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Fig 3. Fixed intervals - clustered

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Fig 4. Variable intervals

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Fig 5. Logarithmic intervals

Floating Interval events - AssetInsights.net
Fig. 6. Floating intervals

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Fig 7. Overlapping intervals


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:


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