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

A logarithmic interval represents an escalation (either gradual or rapid) in the frequency of events over the service life of an asset or over the planning horizon.

The point of inflection on a logarithmic frequency is often associated with point "P" (potential failure)  to the P-F Interval
and delayed start cycle.

The logarithmic interval assumes that the asset is degrading and therefore the frequency of the event (either inspections of the asset or maintenance of the asset) must become more aggressive over time.

A technique of Risk-Based Maintenance (RbM) and Condition-Based Maintenance (CbM).

Variations on the logarithmic interval include the following types of intervals:
Logarithmic interval over a 30-year planning horizon
Fig. Logarithmic interval events expressed over a 30-year planning horizon. Time vs costs.

Logarithmic interval events mapped onto the P-F curve to illustrate the relationship between time and condition.
Fig. Logarithmic interval events mapped onto the P-F curve. Time vs. changing condition.

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