Non-destructive testing

The requirements for detection rate and qualification level can be found in Chapter 10 of GB150； As for non-destructive testing itself, the pass level is related to the severity of defects such as cracks in its test results. Refer to JB4730

You can take a look at the standards JB/T 4730.1-4730.5

The poster needs to read carefully the section on \"VI. Non-destructive testing\" in the Code for Pressure Vessels, clause 10.8 of GB150-1998, clause 9.4 of JBT4710-2005, JBT4730-2005, as well as your company’s standards and the regulations specific to each project. This post was last edited by www557 on 2009-2-25 15:51]

The requirements for non-destructive testing are also in accordance with the relevant provisions of the Code for Pressure Vessels and GB150-1998. This post was last edited by www557 on 2009-2-25 at 16:26.]

The detection rate and acceptable grade shall be determined in accordance with the design requirements of the drawings, and the evaluation for detection shall comply with JB/T 4730--2005

First, check what requirements are specified in the design drawings; if none are available, then refer to the standards to see what they require. Generally, the drawings take precedence.

Also, take a look at the container technology discussion area.

Testing shall be carried out in accordance with the technical requirements of the pattern.

It is recommended that the poster carefully read the relevant standards, such as GB150 and JB/T4730-2005, which provide detailed information on this topic

The original poster, you’re earning points by saying such things in several sub-forums; I’m asking about non-destructive testing, hehe

One is to be familiar with relevant regulations and standards such as pressure vessel codes, GB150, and JB/T4730; the other is to have an understanding of the structure of the tower itself as well as its manufacturing process, in order to carry out non-destructive testing effectively.

Pages P42 of the Code for Pressure Vessels and Page P128 of GB150 specify the methods for non-destructive testing of pressure vessels as well as the acceptable qualification levels. It will be very helpful to also refer to JB/T4730 and books on welding.

Non-destructive testing: Non-destructive testing is a testing technique that enables the detection of internal or surface defects in a material, without damaging the material itself, as well as the measurement of certain physical properties, characteristics, and structural conditions of the material. It is widely used in the testing of metal materials, non-metallic materials, composite materials and their products, as well as some electronic components. Common non-destructive testing techniques include: ① Radiographic testing. Defects in the object under inspection are detected by utilizing the difference in intensity attenuation of X-rays or gamma rays as they pass through various parts of the object. If rays of varying degrees of absorption are projected onto an X-ray film, a photograph showing the variations in thickness and internal defects of the object can be obtained after development. By using a fluorescent screen instead of film, it is possible to directly observe the internal structure of the object under inspection. ②Ultrasound examination. The acoustic properties of the object itself or its defects, and their impact on the propagation of ultrasonic waves, are utilized to detect defects or certain physical properties of the object. The ultrasonic frequencies commonly used in ultrasound testing range from 0.5 to 5 megahertz (MHz). The most commonly used ultrasonic testing method is pulse flaw detection. ③Acoustic emission testing. The performance or structural integrity of a material is evaluated by detecting and analyzing its acoustic emission signals. The phenomenon in materials in which stress waves are generated due to the rapid release of strain energy caused by crack propagation, plastic deformation, phase transformation, etc., is known as acoustic emission. The acoustic emission generated by the material under external influences is detected by acoustic sensors, converted into electrical signals, amplified, and sent to a signal processor, thereby enabling the measurement of various characteristic parameters of the acoustic emission signals. ④Penetrant testing. Surface defects are detected by utilizing the permeability of certain liquids through narrow gaps. Commonly used penetrants are liquids containing colored dyes or fluorescence. ⑤Magnetic particle testing. Defects on the surface or near the surface of an object are detected by the accumulation of magnetic powder in the leakage magnetic field near those defects; the object to be inspected must be ferromagnetic. In addition, new non-destructive testing techniques such as neutron radiography, laser holography, ultrasonic holography, infrared detection, and microwave detection have also been developed and applied.

Non-destructive testing is a testing technique that enables the detection of internal or surface defects in a material, without damaging the material itself, or that allows for the measurement of certain physical properties, characteristics, and structural conditions of the material. It is widely used in the testing of metal materials, non-metallic materials, composite materials and their products, as well as some electronic components. Common non-destructive testing techniques include: ① Radiographic testing. Defects in the object under inspection are detected by utilizing the difference in intensity attenuation of X-rays or gamma rays as they pass through various parts of the object. If rays of varying degrees of absorption are projected onto an X-ray film, a photograph showing the variations in thickness and internal defects of the object can be obtained after development. By using a fluorescent screen instead of film, it is possible to directly observe the internal structure of the object under inspection. ②Ultrasound examination. The acoustic properties of the object itself or its defects, and their impact on the propagation of ultrasonic waves, are utilized to detect defects or certain physical properties of the object. The ultrasonic frequencies commonly used in ultrasound testing range from 0.5 to 5 megahertz (MHz). The most commonly used ultrasonic testing method is pulse flaw detection. ③Acoustic emission testing. The performance or structural integrity of a material is evaluated by detecting and analyzing its acoustic emission signals. The phenomenon in materials in which stress waves are generated due to the rapid release of strain energy caused by crack propagation, plastic deformation, phase transformation, etc., is known as acoustic emission. The acoustic emission generated by the material under external influences is detected by acoustic sensors, converted into electrical signals, amplified, and sent to a signal processor, thereby enabling the measurement of various characteristic parameters of the acoustic emission signals. ④Penetrant testing. Surface defects are detected by utilizing the permeability of certain liquids through narrow gaps. Commonly used penetrants are liquids containing colored dyes or fluorescence. ⑤Magnetic particle testing. Defects on the surface or near the surface of an object are detected by the accumulation of magnetic powder in the leakage magnetic field near those defects; the object to be inspected must be ferromagnetic. In addition, new non-destructive testing technologies such as neutron radiography, laser holography, ultrasonic holography, infrared detection, and microwave detection have also been developed and applied.