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    Civil Confidence in Remnant Life Estimate (Step 8)
    • 09 Aug 2024
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    Civil Confidence in Remnant Life Estimate (Step 8)

    • Updated on 09 Aug 2024
    • 1 Minute to read
    • Contributors
    • Print
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    Article summary

    Find below additional details for Step 8 of the Civil RBI Methodology.

    The key question here is: “How well can we predict the future?”

    To put it in other words: “Do we have sufficient historical data and information about future changes to predict the moment of failure accurately?” The confidence rating reflects the confidence that the Civil engineer has in the assessment of the remaining functional life.

    Influence factors that determine the confidence rating are:

    • Stability of the degradation mechanism
    • Awareness of the damages and events that have occurred to the asset
    • Knowledge about future changes in e.g. environmental conditions
    • Experience with the applied materials and design/construction techniques

    The table below gives the rating options. The default confidence rating is ‘Intermediate’, which is valid for an asset that has been designed to applicable codes and standards and has been constructed with normal quality and for which history is known.

    Table: Confidence classes

    Rating
    Description

    Very Low

    • Degradation mechanism is highly unstable;
    • Inspections have never been carried out or a long time ago;
    • Many future changes expected, effects on the asset are unknown; and
    • Applied techniques/materials/etc. are new, but poorly tested.

    Low

    • Degradation mechanism is unstable;
    • Inspections have been conducted quite some time ago;
    • Future changes expected, effects on the asset are unknown; and
    • Applied techniques/materials/etc. are new, but well tested.

    Intermediate

    (default value)

    • Degradation mechanism is stable;
    • Inspections have been carried out not long ago;
    • No future changes expected; effects of future changes on the asset are known; and
    • Applied techniques/materials/etc. are proven.

    High

    • Degradation mechanism is stable
    • Inspections have been carried out recently
    • No future changes expected; effects of future changes on the asset are known.

    Very High

    • Degradation mechanism is stable
    • Inspections have been carried out very recently
    • No future changes expected; effects of future changes on the asset are known
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