Pipeline RBI Assessments

Benefits

The Pipeline RBI assessments provided the Client with an understanding of whether there is any change to the risk profile of the assets. The assessment considered changes to the asset configuration and process conditions since the previous assessment, as well as any new threats that the asset was exposed to. The Client was able to define and optimise future inspection intervals based on this revised risk profile.

Background

The pipeline RBI assessment was required for six assets that were operated by the Client, which included the pipeline, flowlines (rigid and flexible), associated piping, spools and stabilisation structures. Over the operating life of each asset, it is possible that events occur, and changes are affected, changing the threats and level of risk. These may include events such as active corrosion (internal or external), pipeline walking, riser replacements, changes in process conditions, changes in flow directions and addition of support structures. RBI assessments capture these changes and presents the risk profile that needs to be managed going forward.

Work Performed by Atteris

Atteris conducted an update of the RBI assessments for six assets to ensure that the current level of risk is defined, and an adequate inspection interval is assigned to monitor the risks.

The RBI assessment was based on data received from monthly reports, inspection reports, design documents, engineering studies and management of change records. A timeline of events which had an impact on asset integrity was also prepared.

For each asset damage loop, Atteris defined the credible degradation mechanisms and determined the likelihood and consequence of failure based on data that was available. Confidence levels in the inspection technique was taking into consideration.

Workshops were held with the Client, during which the results of the RBI assessment were presented and discussed.

Individual RBI reports for each asset were prepared. The reports contained a high-level summary of the recommended inspection techniques and intervals.