IRIS â€“ Internal Rotary Inspection System: This is an ultrasonic technique for condition assessment of tubing of all materials with a tube wall thickness greater than 1mm. The technology can precisely measure remaining wall thickness from corrosion, erosion, pitting and wear associated with baffle supports. However it requires a very high standard of cleaning and is a much slower technique than the ECT or RFT test methods.
It is not possible to detect cracking with IRIS. The system uses a rotating turbine head with a transducer sending a single into tube wall via an angular mirror. The image displayed can be seen as a B-Scan (Cross-sectional view) and also in a C-Scan (Development of Longitudinal axis of tube).
- Most ideal for ferromagnetic heat exchanger tubes, but IRIS can be used on any metallic material
- Very accurate wall thickness measurement technique
- Sensitivity to both internal and external defects
- Flexibility as a back-up to remote field, magnetic flux leakage and eddy current inspections