3D FEM of a pipeline with defect using MFL testing under extreme conditions

Corrosion monitoring of pipelines under extreme conditions (underwater and
high temperature) is one of the important task to be carried out as corrosion is
one of the leading causes of failure of steel structures mainly in pipelines.
Magnetic Flux leakage testing technique is the most commonly used and cost
effective method of estimating the extent of damage caused by corrosion in gas
and oil transmission pipelines. In this paper, three dimensional simulation FEM
model on corrosion inspection of various thickness of steel pipe using
COMSOL software has been developed. The MFL signal (B z component) of
defects, which have the same length, same width, and different depths, have
been studied along with array sensors. The MFL signals have also been
obtained experimentally through transmission of data using Radio frequency
technique with an experimental set-up including the same pipe samples of
various thickness measured along an axial line using hall effect and GMR
sensor. This paper discusses in brief about the results obtained through FEM
simulation and experiments done for data transmission which confirms the
potential of the three-dimensional simulation for MFL inspection.