Eddy Current Tube Inspection (ECT)
Eddy current testing is a non-destructive testing method that is commonly used to inspect tubing in heat exchangers, steam generators, condensers, air coolers, and feedwater heaters.
This is the most common technique used for non-ferrous tubing inspection. The technology is very reliable and can determine tube conditions 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. The standard inspection technique for smooth tubing employs two distinct data acquisition channels: absolute (wall reduction) and differential (local defects). An A/C probe is used to reduce noise associated with fins when inspecting finned tubing (chillers). Detailed analysis can be carried out using software tools that can determine the location of defects in relation to the ID/OD of the tube wall using Phase Analysis from depth curves generated by the calibration standard. To evaluate flaws hidden behind baffle supports, software tools also allow for the mixing of baffle signatures.
Eddy Current Tube Testing is an efficient method of determining the condition and lifespan of tubes, particularly in the power generation, petrochemical, chemical, fertiliser, and air conditioning industries. The technique is used to detect corrosion, pitting, cracks, erosion, and other changes to the interior and exterior surfaces of the tube.
It is a high-speed inspection method with the added benefit of being able to perform it through paint and coatings. The technique is only applicable to non-ferrous metals like stainless steel, copper, and titanium. On carbon tubing, we also perform remote field and magnetic based eddy current testing.
- High examination Rate i.e. 80-100 or more tubes can be Inspected/ hour
- Examination of Ferrous and Non-Ferrous material
- Repeatability comparison between historical and subsequent test results to establish corrosion rate and remaining life
- ECT discriminates between ID and OD defect orientation
- ECT is sensitive to gradual wall loss, cracking, small pitting etc.