Development of magnetic flux leakage system for detection of defects in steam generator tube

Abstract

Non-Destructive Testing (NDT) is a method to inspect the newlinespecimen without causing any structural integrity of the specimen. newlineFerromagnetic materials are widely used to fabricate the steam generator tube, newlinegas pipeline and railroad. Periodical inspection is required to prevent newlineaccidents which occur as a consequence of structural defects on the specimen. newlineRemote Field Eddy Current Technique has failed to detect the localized defect newlineon specimen. Magnetic Flux Leakage (MFL) is one among the NDT methods newlineto inspect the ferromagnetic specimen, and also MFL is possible to detect the newlinelocalized defect on the ferromagnetic specimen.This thesis reports the forward problem of MFL using analytical and numerical models with an experimental model. Dipole model-based newlineanalytical expression is proposed to detect the circular defect on the newlineferromagnetic specimen. The analytical expression consists of elliptic newlineintegrals of first kind derived from the magnetic dipole model. The radial newlinecomponent of leakage fields for the cylindrical hole is computed by using newlineMATLAB software. The effectiveness of the model is evaluated by newlinecomparing the estimated dimension of the defect with the actual dimension newline newline