Carat tube and double-wall corrugated pipe, engineering pipe selection reference

In municipal drainage and sewage projects, carat pipe and double-wall corrugated pipe are the two mainstream high-density polyethylene pipes, and the structural difference directly determines the selection direction. Carat pipe adopts winding molding, the inner wall is smooth and flat, and the outer wall is a structural reinforcement layer. The ring has high stiffness and excellent flexibility, especially suitable for foundation settlement or trenchless pipe jacking construction. The hot-melt welding interface can achieve zero leakage. Double-wall corrugated pipe is formed by extrusion process at one time, and the inner and outer walls are corrugated. It is light in weight and economical. It is often used for gravity flow drainage. The construction of socket rubber ring connection is fast, but the stability of the wave peak structure in large diameter needs to be checked. The selection needs to be closely related to the depth of burial, load and working conditions: deep burial, high groundwater level or strict anti-seepage scenarios give priority to carat pipes, with a diameter above DN4000; when conventional shallow burial excavation, tight construction period and limited budget, double-wall corrugated pipes are more cost-effective within DN1200. At the same time, ring stiffness grade, backfill compactness and long-term operation and maintenance needs must also be comprehensively weighed to ensure the safety of the pipeline network throughout its life cycle.