August 2017, Vol. 244, No. 8


Identifying Girth Weld Cracking Threats in CRA Cladded Pipes

In 2013, a new gas line with internal stainless steel CRA cladding experienced a failure. This 16-inch pipeline was commissioned early in the year and occasionally used. The failure consisted of circumferential cracking in a girth weld at a pipe bend. The investigation team recommended a complete inspection of all weld joints on this 6-miles (10-km) line. Ultrasonic inline inspection (ILI) was the only feasible means to inspect this line, and doing so required that a liquid coupling medium be introduced. Due to the importance of the pipeline, a sequence of two inspection runs was selected. The first run was completed using an NDT Global ultrasonic circumferential crack (UCc) tool to addres

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