PAUT Inspection of Contact Point Corrosion Utilising the PA-CAT Technique
The PA-CAT™ phased array technique developed by Holloway NDT & Engineering Inc. is an attenuation-based modelling algorithm used to evaluate the minimum remaining wall thickness at pipe or vessel supports.
Inspection for wall loss at pipe and vessel supports is complicated due to limited access caused by the position of the support, if it is welded to the surface, if other supports are close by etc.
For the inspection of these areas, indirect techniques are required which have the sensors positioned away from the area of interest, and fire into the area of interest from a distance or through the area to another sensor on the other side.
Corrosion profile and pipe geometry can produce very complex transmission paths and attenuation at different angles. Conventional ultrasonic techniques rely on data from only a single angle and often only the edge of a corroded area is detectable leaving the severity of the corrosion unknown.
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