What are the inspection methods for petroleum pipes?

What kinds of inspection methods are there for oil casing? Let's take a brief look at them.

 

1. When the ultrasonic wave is spread in the tested raw materials, the acoustic characteristics of the raw materials and the transformation of the internal structure have a positive impact on the spread of the ultrasonic wave. Through the detection of the affected level and situation of the ultrasonic wave, we can understand the transformation of the function and structure of the raw materials.

 

2. Radiographic detection is based on the difference of the amount of radiation transmitted through normal parts and defects to form the resolution of the blackness on the negative.

 

3. Penetration detection and penetration detection is to use the capillary function of liquid to penetrate the defect of penetration liquid into the surface of solid raw materials, and then to suck the penetration liquid to the surface through the imaging agent to show the existence of the defect. Permeation testing is suitable for all kinds of metal and ceramic workpieces, and the time from penetration manipulation to defect appearance is relatively short, usually about half an hour. It is advisable to detect surface fatigue, stress corrosion and welding cracks, or to directly measure the size of cracks.

 

4. Magnetic powder detection is to use magnetic flux leakage to absorb magnetic powder and form magnetic traces to provide defect manifestation. It can detect surface and sub-surface defects. The nature of defects is simple and easy to distinguish. Paint and electroplating surface do not affect the detection vividness.

 

5. Eddy current testing mainly uses eddy current induced by ferromagnetic coil to analyze the internal quality of the workpiece. It can detect the surface and near surface defects of various conductive raw materials. Normal parameters are difficult to control, and the results of eddy current testing are difficult to explain. Moreover, it requires that the testing object must be a conductive crack and can be measured tactfully. Disadvantage length.

 

6. Magnetic flux leakage testing for oil casing is based on the characteristics of high permeability of ferromagnetic raw materials. The quality of in-service oil casing can be detected by measuring the permeability change caused by defects in ferromagnetic raw materials.

 

7. Magnetic impression detection is the relationship between the physical nature of metal magnetic phenomena and the missed distance. It has many advantages, such as high utilization rate, low cost, no need to grind and so on. It has important and ordinary application prospects in industry.