Solutions

PAUT Inspection of Contact Point Corrosion Utilising the PA-CAT Technique

Inspection for wall loss at pipe and vessel supports is complicated due to limited access. Indirect techniques are required which position sensors away from the area of interest. Corrosion morphology 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 may require highly skilled data analysis.

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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. The Veo3 instrument is fully capable “in the box” to easily generate phased array pitch catch focal laws for two separate transducers at the touch of a button. On board the instrument the multi-skip data can be quickly output and analysed online via www.pa-cat.ca to calculate the “river bottom” plot along the scan length. The PACAT™ modelling algorithm has been developed through extensive testing of realistic corrosion based on laser scans of actual touch point corrosion.

Fig. 1 - PA-CAT axial and circumferential scan configurations

Fig. 2 - PA-CAT results compared to 3D laser scanner and Jireh scanner

Recommended Tool Package

Category	Part#	Description
Acquisition Unit	Veo3 UT BNC KIT OR Veo3 UT LEMO KIT	Veo3 32:64 BNC OR LEMO Note: 32 PR element is required
Probe	2x X2B-001 OR 2x D1A-002	X2B-5M32E-0.6x10-SQX2.5 OR D1A-5M32E-0.8x12
Splitter	ADAP-005 (if X2B’s) OR D1-CABLE-003 (if D1A’s)	PA-Splitter - IX64 to IX32:32 OR D1-CABLE-D-QX2
Wedges	X2BW-003 OR D1AW-004	N60S Wedges kit (ask contouring in regards of the pipe sizes)
Scanner	BGG017-AD-02 (Jireh part number)	4 inches Diameter and up (10.2 cm) NOTE: Alternatively Stix or Jireh Rotix capable of holding two probes in pitch catch orientation

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