Spiral Welded Epoxy Coated Pipe

Spiral Welded Epoxy Coated Pipe

Product Overview

The Spiral Welded Epoxy Coated Pipe is a high-strength, cost-effective piping solution designed for large-diameter transmission and structural applications. This product combines the manufacturing efficiency of Spiral Submerged Arc Welding (SSAW) with the superior corrosion resistance of Fusion Bonded Epoxy (FBE). By applying a specialized epoxy coating to the interior and/or exterior of a spiral-welded steel pipe, this system offers a robust barrier against environmental degradation, making it ideal for long-distance water transmission, piling, and industrial fluid transport.

Key Features and Benefits

• Cost-Effective Large Diameters: The spiral welding process allows for the production of large-diameter pipes (up to 3000mm) from narrower steel coils, offering significant cost advantages over seamless or LSAW pipes for large-scale infrastructure.

• Superior Corrosion Resistance: The epoxy coating (internal and/or external) isolates the steel from moisture, soil, and chemicals, preventing rust and extending the service life to 30–50 years.

• Structural Integrity: Spiral welding provides excellent mechanical properties and flexibility, making these pipes highly resistant to ground movement and seismic activity—crucial for buried pipelines and piling.

• Hydraulic Efficiency: The internal epoxy lining provides a smooth surface (friction coefficient ~0.01), reducing flow resistance and preventing scaling or biofilm growth in water applications.

• Versatile Protection: Can be configured with internal lining for fluid purity, external coating for soil protection, or a dual-layer system for complete isolation.

Technical Specifications

• Product Name: Spiral Welded Epoxy Coated Steel Pipe (SSAW FBE)

• Manufacturing Standard:

• API 5L: Specification for Line Pipe.

• GB/T 9711: Petroleum and natural gas industries.

• SY/T 5037: General fluid transportation pipelines.

• SY/T 5040: Pile pipes.

• Coating Standards:

• External: ISO 21809-2, SY/T 0315 (FBE), or GB/T 23257 (3PE).

• Internal: GB/T 17219 (Drinking Water Safety), CJ/T 120.

• Material Grades: API 5L Gr. B, X42, X52, X60, X65, X70, X80; Q235, Q345.

• Dimensions:

• Outer Diameter (OD): 219 mm (8") to 3000 mm (120").

• Wall Thickness: 6 mm to 25 mm (depending on diameter and pressure rating).

• Length: Typically 6m to 12m (customizable).

• Coating Thickness:

• Internal: 200 µm – 500 µm.

• External: 250 µm – 400 µm (Standard FBE) or thicker for 3PE.

Coating Configurations

1. Internal Epoxy Lining: Used for potable water, sewage, and industrial fluids to prevent contamination and scaling.

2. External FBE Coating: Used for buried pipelines to resist soil corrosion and cathodic disbondment.

3. External 3PE Coating: For high-risk environments (rocky soil, deep burial), the spiral pipe can be coated with a 3-Layer Polyethylene system for maximum mechanical protection.

Applications

Spiral welded epoxy coated pipes are widely utilized in:

• Water Conservancy: Large-diameter municipal water supply and drainage mains.

• Oil & Gas: Gathering lines and transmission pipelines (typically with 3PE or FBE external coating).

• Construction & Piling: Foundation piles for bridges, high-rise buildings, and seawalls (often coated with black or grey epoxy).

• Industrial: Process water, cooling water circulation, and slurry transport.

• Gas Distribution: Low to medium-pressure natural gas networks.