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The process of detecting the presence of internal flaws or other abnormalities in copper and copper alloy seamless pipes using Eddy Current Testing is quite sophisticated yet highly effective. The methodology allows for a detailed survey of the interior and exterior of the pipe to trace out any potential defects or issues. This method is gaining more and more popularity due to its accuracy and efficiency in rapidly assessing the condition of copper and copper alloy pipes without having to remove them or take apart any of the attached components.
Eddy Current Testing starts with the installation of an eddy current probe in or around the desired area to be tested. The probe typically consists of a thin, flat coil of wire (usually around ¼ inch in diameter) attached to a plastic handle. This handle is then connected to a specialized eddy current inspection instrument that contains the necessary electrical and mechanical components to power and operate the eddy current testing process.
Next, the technician will position the flat coil of the eddy current probe over the surface of the pipe and apply a defined amount of electrical current to the coil. As the electrical current is applied, tiny electrical “eddy currents” are generated in the pipe. These eddy currents seek their own path inside the pipe and when abnormal or foreign material is encountered, their paths and intensity are altered. These particular changes are then detected by the eddy current probe and are monitored and recorded by the eddy current testing instrument.
Now, depending on the type of material being tested and the exact location of the eddy current probe, there may be a need to adjust and sometimes completely change the eddy current probe to one of a different style and/or size. This adjustment may be necessary in order to increase the signal strength and signal-to-noise ratio of the eddy current signal readings. Additionally, the technician has the option of using a signal filtering method on the test results to further improve the detection sensitivities of the signal readings and to eliminate many of the “background” signals that may be present due to the same composition material throughout.
As the technician continues to monitor and record the signal readings from the eddy current probe, an image of the internal and external surface of the pipe can be built up and any anomalies can be clearly seen. Any areas that show abnormally high or low signal readings that indicate the presence of a potential defect, foreign material or leak will be marked and marked areas can then be further investigated using more detailed, non-destructive methods.
The entire process of Eddy Current Testing of copper and copper alloy pipes can take a matter of minutes and delivers highly accurate and reliable results that can be used for decision making and preventative maintenance.
