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Pre- "P" Period
Also referenced as "<P" or the "I-P Interval".

The period from the time an asset is placed in service until the point of Potential Failure ("P") along the P-F curve. The period of time before potential failure is reached.

The pre-P period represents the first phase in a three-phase life cycle model and deterioration model of assets:

The pre-P period is characterized by the following general attributes:

The length of the pre-P period varies dramatically across different assets.
Listed below are some examples:
  • Sealed insulated glazing units (10-15 years)
  • Electronic ballasts (10 years)

The following factors will have a bearing on the length and attributes of the pre-P period for assets:

It is important for owners not to get complacent during the pre-P period. Listed below are some key principles to guide the owners:
  • Ensure that all warranty reviews are conducted in sufficient time prior to expiration of the warranty periods.
  • Implement the necessary and sufficient maintenance to preserve the asset.
  • Establish a service contract and maintenance logs for long-term archiving purposes.
  • Start setting aside funds for eventual replacement. Leverage the compounding effect of interest income by starting early at a manageable funding level.
Fig. P-F curve indicating the pre-P, P-F and post-F intervals associated with the lifecycle of an asset.

risk spectrum extending along the P-F interval
Fig. Lower risk of the Pre-P period shown in blue and green on the risk spectrum extending along the P-F interval. Time-based maintenance (TbM) shown in the green zone.

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