Eddy current testing is a non-destructive testing method widely used to examine tubing in heat exchangers, steam generators, condensers, air coolers and feedwater heaters.
This is the most common technique utilized for the inspection of non-ferrous tubing, the technology is very reliable and can determine tube condition in relation to general wall reduction and the presence of local defects such as pitting and cracking with a high probability of detection when using the correct probes. Standard inspection technique for smooth tubing utilizes two separate channels for data acquisition; Absolute (wall reduction) and Differential (local defects). When inspecting finned tubing (chillers) an A/C probe is used to reduce noise associated with fins. Detailed analysis can be performed using software tools which can determine location of defects in relation to ID/OD of tube wall by Phase Analysis from depth curves which are generated from calibration standard. Software tools also allowing for mixing of baffle signature to evaluate flaws hidden behind baffle supports.
Eddy current testing of tubes is an effective way of assessing the condition and lifespan of tubes, particularly in the power generation, petrochemical, chemical, fertilizer and air conditioning industries. The technique is applied to detect corrosion, pitting, cracks, erosion and other changes to both the tube’s interior and exterior surfaces.
It is a high-speed inspection method and one of the major advantages is that it can be performed through paint and coatings. The technique is only suitable for non-ferrous material such as stainless steel, copper and titanium. We also perform remote field and magnetic biased eddy current testing on carbon tubing.
Merits of ECT Tube Inspection
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