The IRIS tube inspection technique is used to inspect both Ferrous & Non- Ferrous tubes from the inside.

A transducer located inside a turbine generates an ultrasonic pulse along the axis of the tube. The ultrasound is reflected on a 45° mirror and oriented towards the tube wall. The Ultrasound is partially reflected by the tube ID, then transmitted through the wall, and finally reflected by the tube OD. The ultrasonic velocity of the tube materials allows the wall thickness to be calculated by using the time-of-flight difference between the OD and ID Echoes.

Advantage

Both ferrous & non-ferrous materials can be inspected.
Detects general wall thinning such as corrosion & erosion and localized defects such as pitting, wear scars.
Measures the absolute wall thickness of the tube.
Inspection speed 2inch/s. Able to inspect around 80 tubes per shift.