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Our Steel Strip Reinforced PE Spiral Corrugated Drain Pipe is a high-end steel-plastic composite drainage solution that integrates the corrosion resistance, sealing performance and flexibility of PE with the high strength and rigidity of galvanized steel strips. It innovatively solves the problems of excessive wall thickness and high cost of large-diameter pure PE pipes with high ring stiffness, and is the core choice for ultra-large diameter, ultra-deep buried and heavy-load underground drainage projects. Adopting an integral hot-melt spiral welding process and full steel strip PE encapsulation structure, this pipe features ultra-high ring stiffness, large flow capacity and excellent settlement resistance, becoming the mainstream high-end pipe material for municipal drainage main pipelines and harsh-condition drainage projects. It perfectly complements small and medium-diameter pure PE drainage pipes to form a complete drainage pipeline system for all scenarios.
Technical Index | Specification |
Material | PE + galvanized steel strip (steel-plastic composite) |
Nominal Outer Diameter | DN300–DN4000mm (customizable) |
Ring Stiffness Grade | SN8/SN10/SN12.5/SN16/SN20/SN25 (SN32/SN40 customizable) |
Connection Methods | Hot-melt butt welding, electrofusion socket welding, heat-shrinkable sleeve, rubber ring flexible socket |
Low Temperature Resistance | -40℃ (no brittle fracture) |
Manning Roughness Coefficient | n=0.009 |
Design Service Life | More than 50 years (municipal drainage conditions) |
Structural Feature | Integral spiral corrugated, full steel strip PE encapsulation |
Customizable galvanized steel strips provide core structural support, with ring stiffness grades up to SN40 on request. It adapts to burial depths of 5-10m and ultra-heavy load conditions such as urban expressways and railway freight yards, remaining undeformed and non-collapsible under vehicle dynamic loads and soil static loads.
The anti-corrosion treated galvanized steel strip is completely encapsulated by the PE layer with no exposed parts, avoiding rust caused by contact with corrosive media. There is no steel-plastic delamination during long-term use, and no additional anti-corrosion treatment is required.
With a maximum customizable diameter of over DN4000mm, it meets ultra-large flow drainage needs of urban rainwater and sewage collection. The smooth PE inner wall (n=0.009) ensures low-resistance drainage, effectively reducing silt deposition and subsequent dredging costs.
The steel-plastic composite flexible structure combines rigidity and toughness, adapting to slight foundation displacement and uneven settlement in coastal silt, collapsible loess and other complex geological areas, without cracking or joint detachment.
All connection methods form a tight seal with the pipe body: hot-melt/electrofusion welding fuses joints and the pipe into one, while rubber ring flexible sockets provide elastic sealing, achieving zero leakage and preventing soil and groundwater pollution.
This steel-plastic composite drain pipe is the exclusive choice for high-end drainage projects with harsh requirements: it is used as ultra-large diameter rainwater and sewage main pipes for urban main roads, expressways and sponge city construction; serves as core sewage interception pipes for urban black and odorous water body remediation and river/lake coastline drainage projects; acts as rainwater and sewage main pipes for large industrial parks, chemical parks and mining areas with mild corrosive wastewater discharge needs; and is applied to deep-buried roadbed drainage for highways, high-speed railways and airport cargo areas. In addition, it is widely used in landfill leachate drainage, urban utility tunnel emergency drainage and super-large residential community outdoor drainage, meeting the high-flow, high-stability drainage needs of municipal, industrial, transportation and water conservancy engineering.
Our Steel Strip Reinforced PE Spiral Corrugated Drain Pipe is manufactured with strict quality control of galvanized steel strips and PE raw materials, and the integral spiral welding process ensures no splicing gaps in the pipe body. We support customized nominal outer diameters (beyond DN4000mm) and ring stiffness grades (SN32/SN40) according to project burial depth and load requirements. The pipe is made of environmentally friendly PE raw materials with no toxic and harmful substance release, and both the PE layer and steel strip can be recycled after decommissioning, fully meeting the material requirements of green municipal engineering.
A1: No heavy cranes are required. The pipe features a lightweight structure (1/8-1/15 the weight of reinforced concrete pipes of the same specification) and can be laid with conventional lifting equipment, greatly reducing installation costs.
A2: Yes. The full PE encapsulation structure isolates the steel strip from corrosive media, and the PE layer has excellent resistance to acids, alkalis and salts, making it suitable for discharge of mildly corrosive industrial wastewater in chemical and metallurgical parks.
