Liquid Penetrant Testing (LPT) is a non-destructive inspection method that uses a visible or fluorescent dye to detect surface-breaking defects such as cracks, porosity, laps, and seams on non-porous metallic materials. The method involves applying a penetrant to the surface, allowing it to seep into defects, removing excess penetrant, and then applying a developer to draw out and reveal indications for visual inspection. LPT provides fast, cost-effective, and highly sensitive detection of surface imperfections, supporting quality control, weld verification, preventive maintenance, and failure analysis in industries such as oil & gas, petrochemical, power generation, aerospace, and manufacturing.
Standard: ASME BPVC Section V, ASTM E165
