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Aging and lifetime extension have consequences for maintenance management

The Petroleum Safety Authority Norway 's survey project shows that aging and lifetime extension have a number of consequences for maintenance management. The results of the project were presented at the PSA's maintenance seminar on 5 November.


The results of the PSA's survey project show that aging and lifetime extension have a number of consequences for maintenance management.

Download report (In Norwegian only): ”Kartlegging av konsekvensene for vedlikeholdsstyring av aldring og levetidsforlengelse” (pdf)

The survey was carried out in the form of presentations in half-day meetings and a questionnaire survey among the companies ConocoPhillips, Talisman, Songa, Dolphin and BP.

In the opinion of the companies, the greatest/most important consequences for maintenance management of aging and lifetime extension are the increased scope of maintenance, that it takes longer to carry out maintenance on older facilities, that there is a greater need for modifications and replacements, that there is an increased need for updating analyses, and stronger focus on continuous improvement and maintenance efficiency.

As regards which aging mechanism poses the greatest challenges in relation to maintenance, this varies somewhat from company to company, but some of the most relevant factors were microbial corrosion (MIC) on pipe systems, corrosion under insulation (CUI) and corrosion in general, degrading of surface treatment, deposits and scaling in process equipment and subsidence of fixed facilities.

"Access to spare parts, competence related to old equipment and the fact that equipment (such as control and safety systems) becomes outdated long before the facility's design lifetime, are also key challenges here," said the PSA's Semsudin Leto when he presented the findings in the report.

Download: ”Survey of the consequences for maintenance management of aging and lifetime extension” (pdf)

Several of the companies that took part in the survey were also invited as lecturers at the seminar. ConocoPhillips, by virtue of its operatorship of the Ekofisk field, is one of the companies with extensive experience on aging and lifetime extension.
In his presentation, Hans Urdal from ConocoPhillips emphasised that aging is not primarily about age, but rather the technical condition.

"As long as you control risk, age is not an issue," said Urdal.

Links to the presentations given at the seminar are found on the right-hand side.

Safe lifetime extension is one of the PSA's main priorities for 2009.