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Equal Life Group (ELG)

A group of assets that all have the same service lives.  Equal life groups are divided into sub-groups, each of which is expected to live an equal life.   

Listed below are some examples of equal life groups to help illustrate the concept. 

  • "All roofs that have a median service life of approximately 20 years".
  • Our three boilers all have a service life of 18 years and therefore they belong to the same equal life group.

Included below are some concepts that can used to analyze the performance of individual asset members within an equal life group:

None of the member assets of an equal life group will fail on exactly the same day and the actual life result are reflected on a 
Probability Distribution
1  1
Fig. Two roofs that have the same service life and therefore belong to the same equal life group.

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