Special equipment includes boilers, pressure vessels, pressure pipelines, elevators, lifting machinery, large amusement devices, passenger ropeways, and on site (factory) specialized motor vehicles, and their operational safety is crucial to ensuring the operation of the national economy and the daily lives of the people. During the construction of special equipment, non-destructive testing (NDT) technology is applied to the inspection and control of raw material production, processing and forming, and welding quality. During the usage, NDT technology is used to promptly detect various damages and defects such as corrosion, cracking, and material degradation that occur during equipment operation. Based on the testing results, the safety status of the equipment can be evaluated, and its remaining life can be assessed. Firstly, discuss the importance and role of NDT and evaluation of special equipment. Secondly, provide the currently mature NDT technologies and various NDT standards for special equipment that have been formulated and published. Thirdly, the focus is on introducing NDT techniques such as microwave, terahertz, laser speckle, magneto acoustic emission, magnetic Barkhausen, and magnetic multi parameter fusion testing technologies, which are suitable for non-metallic material detection or early damage detection such as metal material fatigue and creep. The principles, characteristics, scope of application, instruments, and application of these techniques are summarized. Finally, an analysis and outlook are provided on the demand for NDT technology in future for special equipment, highlighting the main research areas and key tasks that need to be further developed in order to better ensure the high-quality development and safe operation of special equipment.
Key words
Special equipment /
Non-destructive testing /
Nondestructive evaluation /
Emerging technique
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