Double wall corrugated steel pipe combines the structural strength of corrugated steel with the hydraulic efficiency of a smooth interior liner. Designed for storm sewer systems, culverts, detention systems, and drainage applications where flow efficiency is critical, double wall pipe provides an economical solution for projects requiring both structural performance and improved hydraulics.
Manufactured with a helically corrugated exterior shell and smooth steel liner integrally attached at the lock seams, double wall corrugated steel pipe offers the strength of standard corrugated steel pipe while improving hydraulic performance. With a Manning’s “n” value of approximately 0.012, double wall systems are often selected when maximizing flow capacity and minimizing friction loss are important design considerations. The smooth interior liner can improve flow characteristics compared to traditional corrugated interiors, helping support efficient stormwater conveyance.
Available in diameters ranging from 18 inches to 138 inches, double wall pipe is commonly used in transportation infrastructure, municipal drainage systems, site development, and stormwater management projects.
Benefits of Double Wall Corrugated Steel Pipe
Double wall pipe is frequently selected because it combines hydraulic performance with structural strength and installation flexibility.
Key benefits include:
• Improved hydraulic efficiency with a smooth steel liner and Manning’s “n” ≈ 0.012
• Long pipe lengths and fewer joints, helping improve installation efficiency and reduce potential maintenance points
• Structural strength provided by the corrugated steel exterior shell
• Lightweight construction that can simplify transportation and installation compared to heavier alternatives
• Versatile applications for storm sewers, culverts, detention systems, and drainage infrastructure
• Available in large diameters ranging from 18” to 138” for varying project requirements
Depending on project needs, engineers may also compare Standard Corrugated Steel Pipe or evaluate Spiral Rib Pipe for gravity flow applications requiring smooth interior performance.
Common Applications for Double Wall Steel Pipe
Double wall corrugated steel pipe is commonly used for:
• Storm sewer systems
• Culverts and roadway drainage
• Detention and retention systems
• Municipal drainage infrastructure
• Transportation and highway drainage projects
• Sites with weak soils, poor subsurface drainage conditions, steep slopes, or high fills
Its combination of structural integrity and hydraulic efficiency makes double wall pipe especially useful in applications where water flow performance and long-term durability are both priorities.
Corrugated Steel Pipe Coatings and Service Life
Double wall corrugated steel pipe is available with multiple coating options to support corrosion protection and long-term performance in varying environmental conditions. Engineers can evaluate available corrugated steel pipe coatings, including Aluminum Coated Type 2 (ALT2) and polymer-coated steel pipe systems to support project durability goals.
For additional planning and design support, engineers may also explore the Service Life Calculator to estimate expected performance based on environmental conditions.
Engineering Resources for Double Wall Pipe
Selecting the right steel drainage system depends on hydraulic performance, structural requirements, loading conditions, and installation needs. Engineers and designers can review Minimum Cover Requirements, compare specifications using the Design Specifications Chart, or explore additional Technical Resources for drainage system guidance.
Double wall corrugated steel pipe systems are manufactured to recognized industry standards, including applicable ASTM specifications and AASHTO guidance for drainage infrastructure design.