API RP 5UE pdf download.Recommended Practice for Ultrasonic Evaluation of Pipe Imperfections 1 Scope 1.1 This recommended practice describes procedures which may be used to “prove-up” the depth or size of imper- fections. Included in this practice are the recommended pro- cedures for ultrasonic prove-up inspection of new pipe using the Amplitude Comparison Technique and the Amplitude- Distance Differential Technique...