Experimental study on the simulated defects detection in submerged transmission pipeline

Abstract

Long-distance pipelines are commonly used to transport oil, natural gas, water, etc. However, long-term uses without maintenance cause the residue of deposits in the pipeline to gradually adhere to the inside of the pipeline by physical or chemical action, it causing the pipeline to become clogged. And it makes overpressure and leaks in the pipeline, which further impacts the safety of industry and people`s lives. The purpose of this study is to establish a non-destructive inspection to measure the defects in a pipe by ultrasonic technique. The material of the simulated pipe is SCH80 carbon steel pipe with a thickness of about 11mm as standard, and defects were designed such as holes and grooves inside and outside the pipe. The carrier mechanism design is printed by a 3D printer. A submerged ultrasonic transducer is used to evaluate the simulated pipeline and establish that data in an imaging system through LabVIEW and Origin software. Thereby, thickness and defect locations are clearly evaluated. In addition, ultrasonic detection error was calculated within 6.5%. It helps to apply this technique and equipment for underground pipeline inspections to prevent pollution.