Ultrasonic testing technology
Ultrasonic testing is mainly based on the emission phenomenon of ultrasonic waves propagating in the medium, which fully reflects the defects existing in the object to be tested. This technology is generally applied to pressure vessel steel plates, forgings, bolts and the like. This method can show unique advantages when detecting a large thickness of the container shell or the large-mouth joint internal defects. In the actual detection, the use of pulse line ultrasonic detection equipment has many advantages and is widely used. However, it is worth noting that there are some shortcomings in this way, and it is generally not possible to use it for surface inspection of pressure vessels.
2. Radiation detection technology
X-rays can be used to detect defects in the butt welds of small-thickness pressure equipment containers, for non-single-layered pressure vessels Ir-192 that are not easily accessible to the inside of the pressure and other ways that cannot be accessed. The S--e75 isotope was photographed using Y-rays. It is worth noting that this detection technology can also apply repetitive inspections that cannot be found by ultrasound to further determine the nature of the defects, and thus provide reference for the rework of related equipment.
3. Infrared detection technology
The so-called infrared detection technology mainly refers to the use of infrared rays for low-temperature containers to achieve the purpose of understanding the relevant internal conditions. The advantages of infrared detection technology are speed, safety, losslessness, non-contact and zero-fault. Conducting on-line monitoring of high temperature pressure heat vessels enables the detection of high stress locations in normal temperature pressure vessels. Using infrared detection technology, the abnormal phenomenon in the tank can be found in the first time, and the incidence of safety accidents of the low temperature container is reduced to some extent.
4. Magnetic particle detection technology
This technology is also known in the industry as magnetic particle inspection technology. In the implementation of non-destructive testing of pressure vessels, there is a very broad application space. The principle of this technology mainly utilizes the magnetization of the magnetic material to cause the surface leakage magnetic field in the test room to interact with the surface magnetic powder to form a track. Further, the degree of damage of the test component is found, and this technique is generally applied to the manufacture of a pressure vessel. Using this technique, it is possible to detect defects such as white spots and cracks in the magnetic material, which is highly sensitive.
In summary, the application of non-destructive testing technology to cryogenic pressure vessels is a basic safety guarantee. Strengthening the related applications and research of its technology has extremely important practical significance. It continues to promote the development of low-temperature non-destructive testing technology, fundamentally ensuring the safety of China's low-temperature pressure vessels, and thus making outstanding contributions to socialist modernization.
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