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Non-destructive testing of tubing and surfaces relies on several techniques, which often depend on the application and the materials involved. By utilizing a single or combination of the following testing technologies, PWHT has all the capabilities to inspect your tubular equipment according to your national and international standards.
Eddy Current Testing (ECT) 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.
Scheduled shutdowns present an opportunity for planned inspection programs which enable continued operation of critical plant equipment by minimizing unexpected failures. Prior to deciding which techniques are most suitable for your needs the following items should be considered: number of tubes to be inspected; cleanliness of tubes and time available for inspection.