Inspection and Identification of Inner-outer Defects on Oil-gas Pipeline 1

The paper discussed pipeline inner-outer defects inspection a nd identification methods in pipeline magnetic flux leakage (MFL) inspection. Inspectio n vehicle got across defects in some velocity, bringing residual MFL, its signal frequency an d peak value depend on defects size, defects shape, defects in inner or outer, inspected by Hall element sensors… CONTINUE READING