Epoxy Coated Steel Pipe

Epoxy Coated Steel Pipe

Product Overview

Epoxy Coated Steel Pipe, often referred to as Fusion Bonded Epoxy (FBE) or Epoxy Lined Steel Pipe, is a composite product designed to combine the high mechanical strength of steel with the superior corrosion resistance of epoxy resin. These pipes are manufactured by applying a layer of epoxy powder or coating to the interior (lining) and/or exterior (coating) of a steel pipe. This process creates a durable, smooth, and chemically resistant barrier that protects the steel from rust, scaling, and chemical attack, making it ideal for water transmission, fire protection, and industrial chemical transport.

Key Features and Benefits

• Superior Corrosion Resistance: The epoxy layer acts as a robust barrier against moisture, soil, acids, alkalis, and salt water, significantly extending the pipe's service life (often exceeding 50 years).

• Hydraulic Efficiency: The interior coating is extremely smooth (friction coefficient ~0.009–0.01), which reduces fluid resistance, prevents scaling, and increases flow capacity by approximately 15–20% compared to uncoated steel.

• Hygienic & Non-Toxic: The epoxy materials used are typically compliant with GB/T 17219 and NSF/ANSI 61 standards, ensuring they are safe for potable water and do not support bacterial growth or biofilm formation.

• Mechanical Strength: Unlike pure plastic pipes, the steel base provides high tensile strength, allowing the pipe to withstand high pressure, heavy loads, and physical impact.

• Adhesion & Durability: The coating is bonded to the steel at high temperatures, resulting in high adhesion strength (often >30N/10mm) that resists peeling, cracking, or cathodic disbondment.

Coating Configurations

Epoxy coated pipes are available in several configurations depending on the application:

1. Internal Epoxy Lining:

• Purpose: Protects against internal corrosion and fluid contamination.

• Use Case: Potable water supply, fire sprinkler systems, and chemical transport.

• Thickness: Typically 0.25mm to 0.50mm (250–500µm).

2. External Epoxy Coating:

• Purpose: Protects against soil corrosion and environmental stress.

• Use Case: Buried pipelines, underwater crossings, and piling.

• Thickness: Varies by standard (e.g., >0.6mm for standard, >1.0mm for reinforced).

3. Internal & External (Double Layer):

• Purpose: Complete protection for harsh environments.

• Use Case: Mining slurry lines, seawater intake, and aggressive industrial effluents.

Technical Specifications

• Product Name: Epoxy Coated Steel Pipe (FBE / EP Lined)

• Base Pipe Materials:

• Seamless: ASTM A106, API 5L

• Welded (LSAW/SSAW): API 5L, GB/T 3091

• Galvanized Base: GI Pipe with Epoxy Overcoat

• Coating Material: Thermosetting Epoxy Powder (EP).

• Coating Thickness:

• DN ≤ 65: >0.30 mm (Internal)

• DN ≥ 80: >0.35 mm (Internal)

• External: 200µm – 500µm (Standard) or customized.

• Operating Temperature: -30°C to +80°C (Standard Epoxy); up to 90°C for specialized grades.

• Pressure Rating: Matches the base steel pipe (typically PN10, PN16, PN25, or Class 150/300).

• Connection Types:

• Grooved (Victaulic): Most common for fire/water.

• Flanged: For industrial/pump connections.

• Threaded: For smaller diameters (DN15–DN100).

Applications

Epoxy coated steel pipes are versatile and widely used in:

• Fire Protection: The standard material for wet and dry sprinkler systems due to its corrosion resistance and red color coding.

• Potable Water: Municipal water supply networks and building water risers.

• Industrial & Mining: Transporting chemicals, slurry, and wastewater; specifically used in mines for its anti-static and flame-retardant properties.

• HVAC: Chilled water and cooling water circulation systems.

• Cable Protection: Protecting electrical and communication cables in buried applications.

Quality Assurance

We ensure that every epoxy coated pipe meets rigorous performance standards. Our quality control process includes:

• Surface Preparation: Steel is shot-blasted to Sa 2.5 grade to ensure maximum adhesion.

• Holiday Detection: 90% inspection using high-voltage spark testers (e.g., 5kV–25kV) to detect pinholes or voids in the coating.

• Adhesion Testing: Cross-cut and pull-off tests to verify the coating bonds firmly to the steel.

• Bend & Impact Tests: Ensuring the coating does not crack or peel under physical stress.

• Certification: Full compliance with GB/T 17219, CJ/T 120, API 5L, and ISO standards, accompanied by Mill Test Certificates (MTC).