91国产精品

To ensure the quality of spiral steel pipe, spiral steel pipe before delivery should be carried out with a number of strict quality testing. Specific detection is as below:

1. visual inspection. Trough the surface inspection found that there are many weld surface defects and deviations on sizes.

2, physical test. Further testing on the spiral steel pipe by ultrasonic, radiographic, and magnetic permeability and so on.

3, strength test. Through pressure test to check whether weld seam under pressure is tight enough to ensure the strength of spiral steel pipe.

4, density test. By kerosene test, load test and flush water test and other test to check whether there is no-dense spiral pipe defect when storing liquid or gas, such as penetrating cracks, pores, slag, incomplete penetration and loose organization.

5, hydrostatic testing. By hydrostatic test to check for each pipe to ensure leakage does not occur in the larger internal pressure situation.

Is through these five strict and tight quality technical detection technology, it ensures the spiral steel pipe factory in the long-term performance and stability.