NDT Global releases case study on cracking in CRA-clad pipe
NDT Global has released a case study focused on identifying cracking threats in CRA-clad pipe.
The case study is based on a 2013 incident where a new gas line with internal stainless steel corrosion-resistant alloy (CRA) cladding failed.
The 16-inch pipeline was commissioned earlier that year and had only been used occasionally.
NDT Global recommended a complete inspection of all weld joints on the 10-km pipe after it identified the failure was the result of a circumferential cracking in a girth weld at a bend.
Ultrasonic in-line inspection (ILI) was the only feasible method to inspect the line which required the introduction of a coupling medium.
Two inspection runs were selected due to the importance of the pipeline.
The second run utilised an ultrasonic metal loss with pitting resolution (UMp) tool to detect metal-loss anomalies, pitting, laminations, and inclusions.
NDT Global reduced the risks associated with the inspection by preparing and cleaning the line, along with the completion of a re-establishment procedure.
The inspection results were independently verified by Bureau Veritas who found the results to be accurate.
Express reports were delivered within five days of each run, with full reports delivered within the agreed timeline.
NDT Global said, in this case, express reporting had been instrumental in returning the pipeline to normal operation.
For more information visit the NDT Global website.
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