Gas Pipeline Corrosion Mapping Through Coating Using Pulsed Eddy Current Technique

Abstract

In this paper, pulsed eddy current testing of gas pipeline through insulation is studied in both analytical and experimental aspects. This paper shows that Pulsed Eddy Current (PEC) method can be successfully applied in corrosion detection of unburied gas pipeline without removing the insulation. First, the principles of pulse eddy current method are pointed out. Then, the pulsed eddy current test is simulated on a pipe by COMSOL Multiphysics software to reach optimum experimental test parameters. In order to test the new technique, some artificial defects are fabricated on the inner surface of a gas pipe to simulate different corrosion phenomena in practical uses. Then, three insulation layers are coated to the pipe in order to evaluate the efficiency of PEC in detecting the wall thinning areas without removing the insulation.