Under the strict management of design, manufacturing, inspection and use of large-scale pressure vessels in use today, serious defects have rarely been found. Therefore, how to extend the operating cycle of pressure vessels while ensuring the safe operation of pressure vessels, and Shortening the inspection time as much as possible is a concern for the majority of pressure vessel users. Acoustic emission technology meets the above requirements, because it is simple, economical, and highly sensitive, and can detect "dynamic" defects and evaluate the types of defects, which can greatly shorten the inspection time and reduce the downtime. It reduces the loss caused by blind repair and scrapping of pressure vessels, and at the same time avoids the cost of auxiliary work such as can opening and polishing. It has developed into one of the main non-destructive testing methods for pressure vessel inspection and safety assessment.
There is a huge application market for the regular inspection of pressure vessels. Popularizing applications in Guangxi will bring huge economic benefits to users. The principle of acoustic emission technology. The phenomenon of the rapid release of energy from a local source in the material to produce a transient elastic wave is called acoustic emission. Acoustic emission technology is used to monitor cracks through the acoustic emission sensor group on the outer surface of the equipment when the equipment is pressurized in service, such as a hydraulic test. It is a technology to monitor these defects by releasing acoustic energy from defects such as expansion and rupture.
The advantages of acoustic emission technology. Compared with other non-destructive testing methods such as radiography and ultrasound, the acoustic emission technology has the following advantages in the detection of large pressure vessels: because it provides dynamic information of defects under stress, it is suitable for evaluating the actual harmfulness of defects to the structure; realizing continuous online Monitoring is suitable for on-line monitoring of industrial processes and early or near-damage prediction; due to the low requirements for access to inspected components, it can be adapted to complex detection environments, such as high and low temperature, nuclear radiation, flammable, explosive and toxic environments; Because it is not sensitive to the geometric shape of the component, it is suitable for components with complex shapes where other detection methods are limited; multi-channels are used to achieve overall or large-scale rapid detection, and a small amount of insulation layer removal can be carried out after a single loading or test process. Determining the location of the defect has high detection efficiency, which can greatly save time and money, and some can also avoid the process of opening the can, and the economic benefits are very obvious.