Pipeline testing using non-destructive testing (NDT) methods is a commonly used technique to ensure the safety and integrity of pipelines. The following are some examples of NDT solutions that are used for pipeline testing: Ultrasonic Testing (UT): This method uses high-frequency sound waves to detect internal and external defects in pipelines. It can be used to detect corrosion, cracks, and other types of damage. Radiographic Testing (RT): This method uses X-rays or gamma rays to create images of the internal structure of pipelines. It can be used to detect internal defects such as cracks, voids, and porosity. Magnetic Particle Inspection (MPI): This method uses a magnetic field to detect surface and subsurface defects in pipelines. It can be used to detect cracks, corrosion, and other types of damage. Liquid Penetrant Inspection (LPI): This method uses a liquid penetrant to reveal surface defects in pipelines. It can be used to detect cracks, porosity, and other types of damage. Visual Inspection (VI): This method uses visual inspection to inspect the external condition of pipelines. It can be used to detect corrosion, dents, and other types of damage. Acoustic Emission Testing (AET): This method uses sensors to detect and locate leaks and other defects in pipelines by listening to the sounds emitted by the pipeline. These methods can be used individually or in combination to provide a comprehensive evaluation of the pipeline's integrity. The choice of method or methods depends on the type of pipeline, the location of the pipeline, the type of defect to be detected, and the budget available for the testing.