The MFL+TFl tool is composed of an axial excitation detection section and a circumferential excitation detectiorsection. Circumferential excitation detection magnetic field is distributed along the circumferential direction of the pipe wall, which can detect axial defect signals, and has strong detection ability for axial grooves. Axiaexcitation detection and circumferential excitation detection complement each other to realizeomni-directional detection.

The self-propelled caliper can complete the detection work through autonomous crawling, which can imple-ment the geometric deformation detection and center-ine mapping before the new pipeline is put intoproduction, provide basic data for the new pipeline.

MFL can complete the detection of pipe defects, metal loss, pipe material changes, internal and external defectdiscrimination, pipe characteristics (pipe hoops, scar repair, bends, welds, tees, etc.), and provide comprehensive information of defect area, depth, orientation, location and so on.

The caliper tool can detect the depression, ovalitydeformation, wall thickness change of the pipeline,and various pipeline accessories that cause the innerdiameter of the pipeline to change.