Guided Wave Twisted Tube® Heat Exchanger (GWTT) inspection technology was developed specifically for the rapid inspection of Koch Heat Transfer Company’s Twisted Tube® Heat Exchanger tubing. The GWTT technology takes advantage of the long-range propagation characteristics of ultrasonic guided waves in conjunction with modes and frequencies that are insensitive to the unique geometry of the tube, yet sensitive to corrosion, pitting and spalling.  An overview of the technology is as follows:

• Probe is placed in the end of a tube and expanded with a hydraulic cylinder
• A portable, battery-powered pulser/receiver controlled via a laptop is used to excite and receive guided wave energy from the transducer
• Data is stored and analyzed for the presence of defects
• Once a decision regarding tube integrity has been made the results can be presented in a visual representation of the tube array
• Available in a range of sizes to comply with any tube geometry