Guided Wave Ultrasonic Testing (GWUT) has quickly become a preferred method for screening large piping segments, insulated piping, or inaccessible/difficult to access piping. GWUT is an effective screening tool for detecting anomalies in piping that can then be followed up by a quantitative means of NDT to determine the severity. Under the right conditions, GWUT can be used to screen many feet of piping for internal/external corrosion in just a matter of minutes from a single access point. It can also be used to locate girth welds on insulated piping circuits should those welds need to be accessed for any type of inspection. Primary applications are insulated piping, buried piping, and pipeline road crossings.