Guided Wave Ultrasonic Testing of Encased Pipeline and Spacer Selection The performance of guided wave ultrasonic testing (GWUT) or long-range ultrasonic testing (LRUT) is generally well understood in aboveground and underground inspection applications [1]. At this time, the expected inspection range for uncoated and coated pipe are also well understood for GWUT testing of above and underground piping systems [2]. A niche GWUT testing market are pipelines that travel under

Guided wave ultrasonic testing (GWUT) or long-range ultrasonic testing (LRUT) is a non-destructive testing (NDT) method that uses torsional, longitudinal, or flexural ultrasonic waves to detect percent cross-sectional area (%CSA) loss in process, petrochemical, transmission, and other industry piping systems. Depending on the pipe condition the sensitivity can be as low as 1% CSA loss but a more reasonable number is 5% given the wide range of inspection variables which includ