Non-destructive inspections (NDI) use methods that inspect materials without damage. A few different terms refer to testing materials without destroying them. Besides NDI, non-destructive testing (NDT) and non-destructive evaluations (NDE) exist. Continue reading to explore the most common types of non-destructive inspections.
A visual inspection is the most basic type of non-destructive testing (NDT). A technician will look over the material for signs of wear and tear. Many maintenance professionals use this method daily to inspect industrial machines. It can uncover signs of greater damage and signal that the job requires a more focused professional. Remote visual inspection devices give technicians a closer look at machinery.
Technicians use gamma radiation or X-radiation to point out imperfections in the system. The radioactive isotope and X-ray generator will send radiation into the component that will show up on the detector. A shadowgraph will display the results that the inspector will use to determine the problem locations.
Leak testing determines if a system has sprung a leak. This method finds and studies leaks in a structure or vessel. Technicians use pressure gauges, listening devices, and soap-bubble examinations during testing.
Eddy Current Testing
This NDI method is also known as electromagnetic testing (ET). The inspector will measure the strength of eddy currents in a material’s magnetic field. Technicians will locate defects in the device by noticing interruptions in the electric current.
This method uses high-frequency sound waves to locate the material’s property changes. The transmission of sound waves allows inspectors to detect imperfections on the material’s surface. Pulse echo is the most common type of ultrasonic testing. Other types include time-of-flight diffraction, phased array ultrasonic testing, and automated ultrasonic testing.
Dye Penetrant Testing
Sometimes referred to as liquid penetrant testing, dye penetrant testing uses a liquid to coat the material and look for breaks in the dye to locate imperfections. Technicians always remove the excess solution to detect the problem area. A developer will draw out a solution based on the inspector’s findings.
Turn to Advanced Turbine Support if your business needs a technician to handle any of these common non-destructive inspections. Our borescope inspection services will provide your turbine with quality services. You can trust Advanced Turbine Support for all your turbine needs.