![]() About15 minutes is generally specified to enable the dye to penetrate any very fine imperfections. It can detect surface breaking imperfections only and relies on a coloured or fluorescent dye, sprayed on the surface and penetrating the imperfection. LPI is a simple, cheap and easily portable inspection method that requires no equipment apart from spray cans. ![]() Liquid penetrant (LPI) and magnetic particle (MPI) inspection techniques are methods that supplement visual inspection, revealing defects such as fine cracks or micro-porosity that would be invisible or difficult to detect by the naked eye. It is accepted that all welds contain features or imperfections but it is only when an imperfection exceeds the relevant acceptance standard does an imperfection become a defect – as ASME states “. Note that both the ISO specifications and the ASME codes differentiate between an ‘imperfection’ (ISO) or a ‘discontinuity’ (ASME) and a ‘defect’. National Structural Integrity Research CentreĬlick here to see our latest technical engineering podcasts on YouTube. ![]()
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