1. Looking from the spiral pipe. In appearance, we should pay attention to those welded joints. Looking at the appearance is not a shortcoming, there is a lack of scale. Through the naked eye, we can see that, of course, detailed and bilateral theory, using standard models, instruments and magnifiers to view. Because of the appearance of welding defects, it means that the inner part of spiral pipe is most likely to have defects, even if the external efforts are not completed, the internal efforts are difficult to guarantee.


2. The inspection method is to use equipment to check, that is, there is no risk of pipeline borrowing, ultrasonic inspection, radiographic inspection, penetration testing and magnetic inspection methods can see the defects not seen in the spiral tube. In addition to the defect view, you can also see the strength of the pressurized container. There are usually two kinds of hydraulic and pneumatic tests. This view is to see the weld fineness of spiral steel pipe, usually using a more accurate gas pressure view. But the pressure is dangerous, if not carefully operated according to the rules, there will be safety accidents.


Spiral steel pipe also has to see through cracks, no pore, no mixed slag, no seepage, no loose layout, usually oil test, water test or water test and other measures. In addition to water testing, the operation can ensure that there is no leakage specification of the pipeline.