Galvanized Corrugated Pipe

Galvanized Corrugated Pipe, made from Corrugated Metal Pipe (CMP) or Corrugated Steel Pipe (CSP), undergoes a hot-dip galvanizing process to improve its durability. The distinctive corrugated design, combined with the galvanized coating, allows the pipe to adapt to foundation movements and resist corrosion, thereby greatly extending its service life. This makes it an ideal replacement for circular or arched concrete culverts, which are commonly used in drainage systems and vehicle passageways. Additionally, its design supports quick assembly, making it useful for building temporary pathways or cofferdams in emergencies.

Product Specifications

Category	Common Specifications & Properties
Material	Base Metal: Steel (often copper-bearing carbon steel). Metallic Coating: Zinc (galvanizing) applied via hot-dip process.
Dimensions	Diameter: 6 inches (150 mm) up to 144 inches (3600 mm)+. Wall Thickness (Gauge): 18 gauge (0.052 in / 1.3 mm) to 8 gauge (0.168 in / 4.2 mm)+. Length: Standard 20-24 feet (6-7.3 meters), custom available. Shapes: Full circular, pipe-arch, elliptical, arch.
Corrugation Profile	Common Sizes (Pitch x Depth): – 1.5″ x 0.25″ (38mm x 6.5mm) – 2.67″ x 0.5″ (68mm x 13mm) – very common – 3″ x 1″ (75mm x 25mm) – 5″ x 1″ (125mm x 25mm)
Zinc Coating Weight（Hot-Dip Galvanizing）	Standard: Minimum 2.0 ounces per square foot (textoz/ft2) total (approx. 610 textg/m2 or 43 mum per side). (Higher weights for aggressive environments).
Standards	Primarily governed by: ASTM A760/A760M and AASHTO M36 (for pipe and metallic coating).
Joints	Connecting Bands: Overlapping bands secured with bolts. Gaskets: Rubber/neoprene for soil-tight/watertight joints.

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Advantages

Excellent Corrosion Resistance: The galvanized coating effectively blocks corrosive agents, making it suitable for saline, coastal, or industrial acid rain environments. Its lifespan is several times longer than that of ordinary smooth pipes.
High Structural Strength: The corrugated design boosts load-bearing capacity, enabling it to withstand soil pressure, traffic loads, and impacts—ideal for culverts and tunnels.
Good Flexibility and Adaptability: The corrugated structure allows slight deformation without cracking, effectively accommodating ground settlement and uneven terrains. It is suitable for bends, turns, and complex layouts.
Lightweight and Easy to Install: Designed for easy handling and installation, helping to cut labor and construction costs.
Cost-Effective: Lower initial cost, minimal maintenance, long service life, and optimized lifecycle cost.
High Flow Capacity: The corrugated design improves hydraulic performance, enhancing drainage efficiency and reducing the risk of clogging.

Applications

Culverts: Under roads/railways for water flow.

Stormwater Drainage: Highways, urban areas, airports.

Underground Conduits: Protecting cables/utilities.

Small Bridges/Underpasses: Economic alternatives.

Mining: Ventilation shafts, dewatering systems.

Agriculture: Field drainage, irrigation.

Rehabilitation: Relining old culverts without excavation.

Temporary Access: Quick road/bypass solutions.

Manufacturing Process

The manufacturing process of galvanized corrugated pipes is a multi-step process that typically includes steel pre-treatment, corrugation shaping, and galvanizing.

Step 1: Steel sheets are shaped into smooth steel pipes using processes such as rolling and welding. After that, the pipes are corrugated with corrugating machines.

Step 2: The pipe surfaces go through Alkaline Washing, Pickling, Rinsing, Fluxing, and Drying.

Step 3: Using hot-dip galvanizing, the treated corrugated pipes are fully immersed in a molten zinc bath at about 455 °F ± 5 °F. This forms a thick, even, and strongly adherent zinc alloy coating on their surface.

Step 4: The galvanized corrugated pipes are water-cooled, followed by External/Internal Blowing and Passivation to stabilize the zinc layer.

Finally, the galvanized corrugated pipes undergo quality inspection and packaging.

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Galvanized Corrugated Pipe