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Post- "F" Period
Also referenced as: >F.

The period of time after an asset has reached functional failure ("F") along the P-F curve.

The post-F period represents the final phase in a three-phase life cycle model and deterioration model of assets:

Attributes:
The post-F period is characterized by the following general attributes:

  • The maintenance mix has a heavier emphasis on corrective maintenance.
  • Maintenance events, if any, are typically carried out floating intervals since the work is reactionary and no longer based on predictive cycles.
  • High risk associated with collateral damage.

Duration:
The length of the post-F period varies dramatically across different assets.
Listed below are some examples:
  • Wood siding is sometimes difficult to predict in the post-F period and protective re-coatings can hide, albeit temporarily, the condition of the substrate.

Analysis:
The following factors will have a bearing on the length and attributes of the post-F period for assets:

Management:
This is a very difficult stage to manage in the life of an asset. Listed below are some management principles to guide owners:
  • Determine if the asset qualifies as a statistical outlier (ie., heavy positive skewness)
  • Ensure that funds are available for replacement of the asset.
  • Obtains competitive bids for replacement of the asset.
  • Determine the other projects that may be competing for funding resources.
P-F curve indicating the pre-P, P-F and post-F intervals associated with the lifecycle of an asset.
Fig. P-F curve indicating the pre-P, P-F and post-F intervals associated with the lifecycle of an asset.

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