This recommended practice (RP) describes procedures that may be used to "prove-up" the depth or size of imperfections. Included in this practice are the recommended procedures for ultrasonic prove-up inspection of new pipe using the Amplitude Comparison Technique (ACT) and the Amplitude Distance Differential Technique (ADDT) for 1) evaluation of surface breaking imperfections in the body of pipe and 2) surface breaking and subsurface imperfections in the weld area of electric-resistance, electric-induction, or laser welded pipe. The applicable specification shall be the basis to determine the type and location of imperfection that is to be detected by inspection, and the acceptance/rejection criteria for the imperfection. For the purpose of this document, pipe is defined as including casing, plain-end casing liners, tubing, plain-end drill pipe, line pipe, coiled line pipe, pup joints, coupling stock, and connector material.