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|Pre- "P" Period
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:
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:
Fig. P-F curve indicating the pre-P, P-F and post-F intervals associated with the lifecycle of an asset.
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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