In our opinion, the pipeline life expectancy approach should, alongside a theoretical component, always contain one of more practical inspections. This was done for a pipeline owned by Water Board NZV. The fact that a roundabout would partly be build on top of the pipeline, was a motivation for the organisation to research the remaining life time.
On the basis of available theoretical information it was only possible to identify an average remaining life time. By carrying out a number of small specific non-destructive measurements (without deploying the pipeline operations) it seemed that on several locations the expected life has already been reached. The results were used to support asset management decisions and made it possible to identify and implement specific mitigation measures.