Ultrasound testing is a non-destructive method in which beams of high-frequency sound waves are introduced into a test object to measure wall thickness or to detect flaws in the material. The audible frequency range for the human ear is between 20 Hz and 20 kHz: sound waves with frequencies above 20 kHz are called ultrasound.
The ultrasound crack detection technology is based on the measurement of the time-of-flight of ultrasonic signals reflected from the internal and external surfaces of the pipe wall. A sufficient number of sensors ensure full circumferential coverage of the test piece (e. pipe wall) inspected. An unique sensor-guidance design provides reliable and accurate ultrasonic data results.
Ultrasound crack detection is used to detect for single cracks and crack clusters. Because of the data redundancy (cracks always recorded from both directions), there is an increased reliability. The technology is versatile application, e.g. suitable for axial and circumferential cracking, accurate crack length and depth sizing, excellent weld inspection through sensor offset towards longitudinal weld, girth weld respectively (especially for small tool design), high pressure application or high temperature application.