Pipe scanning system contains four scanning heads, which are spaced at 90 degrees around the interior of the pipe circumference, and are pressed against the walls pneumatically. The scanning heads use rolling transducer assemblies to receive the signals from solenoid impactors mounted adjacent to the receivers. As the scanner assembly is pulled down a pipe, data is collected sequentially from each scanner head, resulting in a linear test spacing of about 6 cm per test. The data is collected into a large data file and saved. Analysis of the data results in plots of distance versus effective pipe wall thickness for each of the scanner heads, which reveals any areas of delamination or other defects. Testing rates in clean pipe have been found to be about 6 m (20 feet)/ 5 minutes forth prototype system, not including initial set-up and takedown time.