Abstract: A method for performing ultrasonic inspection to a pipe is described, comprising: introducing an in-line inspection tool assembly into a pipe, wherein the in-line inspection tool assembly comprises a gel reservoir and an ultrasonic inspection tool flanked by a pair of batching pigs, wherein the gel reservoir holds a first gel couplant; and driving the in-line inspection tool assembly along the pipe while performing ultrasonic inspection; wherein a gel slug is formed between the pair of batching pigs, and the gel slug facilitates the ultrasonic inspection.

Abstract: A technique facilitates in-service inspection of a variety of assets while in the field. The system and technique may be used for the in-service inspection of various tubular elements, such as deep-water oil and gas risers and flow lines. This approach enables a rapid and reliable inspection for cracks or other defects in assets after those assets have become operational in the field.