Other than the Inline Inspection (ILI) technique, no other reliable technologies are currently available to inspect defects contained within sleeved sections of pipeline. This can lead to risk associated with accurately determining the period in which corrosion started to develop between Inline Inspections, and therefore the corrosion rate.
The suitability of alternative pipeline inspection systems, such as ultrasonic guided wave inspection system, for use as a complement to the Inline Inspection (ILI) technique is not fully understand at this time. Information gained from this study will provide a better understanding of the process involved with the inspection of pipeline areas where metal loss has been found during a standard Inline Inspection, currently scheduled at approximately 10-14 year intervals.
The key objective is to evaluate a number of guided wave ultrasonic inspection techniques for their suitability in use on above ground inspection of sleeved pipe sections.