Pulse echo CHIME
The pulse echo CHIME technique is used for scanning vessel shells, including the compensating pads around nozzle openings and under support welds, the dished ends and, where accessible, associated vessel pipe work either side of Graylocs and pipe supports. The scans are digitally saved for repeatability.
Principles of CHIME
The technique uses two ultrasonic transducers (that can be separated by up to one metre) to flood the region in between with a series of ultrasonic waves having particular characteristics. Defects interfere with these signals and change the characteristics of the pattern. The nature and extent of the change in the signal correlates to wall loss. The additional data gathered by PE CHIME provides confirmation of changes in surface condition and assists in accurately locating pitting type defects.
Capability:
Following the advancement of PE CHIME, AGR has identified the technique as being in a class of its own for the detection of defects in previously inaccessible areas. These include pipe supports, vessel and heat exchanger saddles, sleepers, under wrapping, clamps etc. In addition, PE CHIME is an effective rapid screening technique for non-intrusive inspection (NII) of vessel plate material, tanks, pipe work and ship hulls.
"CHIME is a registered trade mark of ESR Technology Ltd in the USA and the European Union".
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