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    Liquid (Dye) Penetrant Testing (DPT/PT)

    Liquid (Dye) Penetrant Testing (DPT/PT)

    Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking flaws in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components. DPI is based upon capillary action, where surface tension fluid low penetrates into clean and dry surface-breaking discontinuities. Penetrant may be applied to the test component by dipping, spraying, or brushing. After adequate penetration time has been allowed, the excess penetrant is removed and a developer is applied. The developer helps to draw penetrant out of the flaw so that an invisible indication becomes visible to the inspector. Inspection is performed under ultraviolet or white light, depending on the type of dye used - fluorescent or non-fluorescent (visible).

    We offer superior NDT auditing services which includes decidedly competent review of your NDT systems, procedures and personnel. MSPEC implements purpose oriented NDT methods and techniques which are executed in a user interactive manner. By outsourcing your NDT auditing to us, you can benefit from our expertise and years of auditing experience in a wide range of industry sectors

    The PT Level II course topics include:

    • The principles and theory of performing liquid penetrant examination, methods and equipment

    • Selection of appropriate test method

    • Processing & application

    • Variables in testing methods

    • Operations and descriptions of portable and stationary equipment

    • Review of indications, discontinuities and their appearances

    • Inspection and evaluation

    • Procedures and standards