Large Diameter Prestressed Metal Corrugated Pipes ASTM Standard Oval Section Shape

Large Diameter Prestressed Metal Corrugated Pipes with an oval section, manufactured in compliance with ASTM standards (e.g., ASTM A797 for corrugated steel pipes, ASTM A106 for base metal), are specialized structural and fluid-transmission components. Their design integrates "large-diameter capacity," "prestressed reinforcement," "oval section adaptability," and "corrugated structural strength," making them ideal for underground drainage, highway culverts, and large-scale infrastructure projects. Core features are detailed below:

Metal bellows

Metal bellows are continuous/non-cracked/non-leaking 1.Smooth cut 2.Stable performance

3.Easy to install and use

Various specifications can be customized

1.The surface is bright and has no burrs.

2.The product has good pressure resistance and can bear the weight of an adult.

3.It has good sealing and is safe to use without leakage.

1.Good bending performance. The corrugated tube body is bendable, which is easy to install. Use PVC + metal hose to effectively protect the cable.

2.Wear-resistant The plastic-coated hose is made of thickened material, which greatly improves the tensile strength of the hose

The plastic-coated hose is made of thickened material, which greatly improves the tensile strength of the hose

3.High temperature resistant The surface of the plastic coated hose is made of PVC material and fire retardant is added to the PVC plastic

1. Compliance with ASTM Standards & Reliable Quality

• Strict Adherence to ASTM Specifications: Fully meets ASTM standards for material, performance, and dimensional tolerance:

• Base Metal Requirements: Uses high-strength carbon steel or low-alloy steel (e.g., ASTM A106 Grade B) with tensile strength ≥415MPa and yield strength ≥240MPa, ensuring load-bearing capacity for large-diameter applications.

• Corrugation & Coating Standards: Follows ASTM A797 for corrugated steel pipe (CSP) manufacturing, including corrugation pitch (typically 50–150mm), depth (15–50mm), and hot-dip galvanization requirements (zinc coating thickness ≥85μm for corrosion resistance).

• Quality Testing: Mandatory factory tests include hydrostatic pressure testing (to verify leak tightness), structural load testing (for compressive/bending resistance), and galvanization adhesion testing—eliminating defects like corrugation cracks or coating peeling.

• Interoperability with Global Projects: ASTM compliance ensures compatibility with international infrastructure designs (e.g., U.S. highway culverts, global drainage systems), avoiding mismatches with standard fittings (e.g., end caps, connectors) or construction techniques.

2. Oval Section Design: Space-Saving & Terrain Adaptability

• Optimized for Limited Vertical Space: The oval cross-section (e.g., 1200mm×600mm, 2000mm×1000mm) has a smaller vertical height than circular pipes of the same flow capacity. This is critical for underground projects with restricted vertical clearance, such as:

• Highway/railway culverts (where the pipe must fit under roadbeds without raising the pavement height);

• Urban underground utility tunnels (where multiple pipes share limited space with cables or water lines).

• Efficient Flow Capacity with Flat Base: The oval section’s wide, flat bottom ensures stable placement on uneven terrain (e.g., sloped ground, soft soil) without additional bedding reinforcement. Its cross-sectional area is comparable to circular pipes of similar diameter, maintaining high fluid flow rates (suitable for large-volume drainage, such as stormwater or industrial wastewater).

• Uniform Stress Distribution: The oval shape distributes external pressure (e.g., soil weight, traffic loads) evenly across the pipe’s top and sides, avoiding stress concentration at the crown—common in circular pipes under vertical compression. This reduces the risk of deformation in high-load scenarios (e.g., under highway traffic).