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Six Most Common NDT Methods

Six Most Common NDT Methods. Visual Liquid Penetrant Magnetic Ultrasonic Eddy Current X-ray. Visual Inspection. Most basic and common inspection method. Tools include fiberscopes , borescopes , magnifying glasses and mirrors.

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Six Most Common NDT Methods

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  1. Six Most Common NDT Methods • Visual • Liquid Penetrant • Magnetic • Ultrasonic • Eddy Current • X-ray

  2. Visual Inspection • Most basic and common inspection method. • Tools include fiberscopes, borescopes, magnifying glasses and mirrors. • Portable video inspection unit with zoom allows inspection of large tanks and vessels, railroad tank cars, sewer lines. • Robotic crawlers permit observation in hazardous or tight areas, such as air ducts, reactors, pipelines.

  3. Liquid Penetrant Inspection • A liquid with high surface wetting characteristics is applied to the surface of the part and allowed time to seep into surface breaking defects. • The excess liquid is removed from the surface of the part. • A developer (powder) is applied to pull the trapped penetrant out the defect and spread it on the surface where it can be seen. • Visual inspection is the final step in the process. The penetrant used is often loaded with a fluorescent dye and the inspection is done under UV light to increase test sensitivity.

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