Civil Susceptibility Class (Step 5)

Negligible

• The asset is over-designed for the applicable degradation mechanism, e.g., material quality is better than required
• It is very likely that the actual lifetime will be twice the design lifetime.

Low

(default value)

• The design has considered all applicable actors that cause the degradation mechanism (e.g,. correct coating has been applied).
• It is very likely that the design lifetime will be reached.

Medium

• Some applicable parameters for the degradation mechanisms have not been considered in the design, because of insufficient awareness of their existence or knowingly (e.g., due to budget restraints).
• It is likely that the design lifetime will not be reached without intervention (maintenance/repair) after half of the design life.

High

• The design has neglected the applicable parameters for age-related failure to a considerable extend.
• It is very likely that the design lifetime of the asset will not be met, and that maintenance intervention is required earlier than a fourth of the design life