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The term has three applications within the field of asset management,
which are summarized below.
1. Proximity to Functional Failure ("F")
Proximity refers to the distribution of the individual capital projects over time, within a prescribed planning horizon, and relative to the base year.
For example, a roof renewal that has been forecast for the year 2020 has closer proximity than a roof renewal in 2025.
Proximity has a significant financial impact on funding requirements as it has a bearing on the amount of time the owners have to raise the monies for each project.
Proximity models provide a straight line calculation to each capital event across the planning horizon but the straight line is always set to the base year.
An expression of the probability of failure (PoF) of an asset in terms of the number of years of remaining useful life.
2. Proximity to Potential Failure ("P")
The number of years until it is forecast that an asset will reach the point of potential failure along its P-F curve. In other words, how much time until a shift needs to be made in the maintenance strategy to preserve the asset during the latter part of its lifecycle.
3. Proximity to Past P and F.
The amount of time that separates a building from:
It is paramount that the owner group understand that its funding history has a tremendous impact on its funding trajectory.
The aggregate of all the project proximities within a planning horizon is referred to as the proximity load (see also: capital load).
"Where we have been" is just as important as "where we are going". An understanding of the interaction of the past, present and future is captured in the principles of “catch-up” and “keep-up”.
Fig. Proximity of the base year to future projects and past projects across a 10-year tactical plan.
Fig. Proximity load measured across a tactical planning horizon by adding the remaining useful life to each asset renewal project.
Fig. The impact of proximity on unfunded liability - relative to base year and placed in service year.
Fig. Proximity to Potential Failure ("P") and Functional Failure ("F") along the P-F curve.
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