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2020.09-Pulsed Eddy Current Testing of Sinopec Jiujiang Branch2020.09

2020.09-Pulsed Eddy Current Testing of Sinopec Jiujiang Branch2020.09

PECT practical case sharing

During the inspection process, using 12mm of the intact part of the equipment body as a reference, it was found that there were corrosion losses of 10%-30% in varying degrees in the grid, with the most severe loss in the middle and lower parts of the head, covering an area of approximately 300*400mm. According to electromagnetic ultrasonic testing, Thickness verification, the minimum value of the thinned place is 5.91mm, which indicates that the equipment is corroded. After testing the same batch of heat exchangers, it is found that there is a certain degree of thinning at the same position. According to the verification results, it is judged that there is a bulge at this position, and the rear head part Open it and verify that there is indeed a bulge, and there are varying degrees of pit corrosion around the bulge.

Case 2 Pulsed Eddy Current Testing of Sinopec Jiujiang Branch

  • Grid the pipe before inspection to facilitate observation of the location of the thinned area (see Figure 2)
  • During the test, the 10mm intact part of the device body is used as a reference.
  • We found that there are varying degrees of corrosion thinning of 10%-30% at the bottom of the straight pipe (see Figure 1). The wall thickness loss is obvious, and the insulation surface is intact after removal.
  • Finally, it was verified that there was internal corrosion and there was a large amount of fluid accumulation inside the pipeline, which was consistent with the test results.

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