We all know that there are grades of double-wall corrugated pipes
Distinguishing method 1. The classification of double-wall corrugated pipes is mainly the distinction of ring stiffness, which is divided into S1 and S2. ;Differentiation method 2. Double-wall corrugated pipe is a kind of smooth avatar with optimized internal smooth cross-section under the premise of saving raw materials and not losing the rigidity. The outer wall of the trapezoidal corrugated girl or the community of corrugated ribs between the inner and outer walls, Formation of the technology for the production of pipes. Distinguishing method 3. In many cases, the method of processing the process of hdpe double-wall bellows through some level of detection. Distinguishing method 4. Basically, all of them are used for sewage treatment in the municipal center. S1≥4 kn/s3 several levels, s3≥16 kn/s, s0, ≥2 kn/s2; the rigidity of the square ring is divided into S0, S1. Square meter; M2, S2 ≥ 8kn/m2.