Internal Epoxy Coated Steel Pipe

Internal Epoxy Coated Steel Pipe

Product Overview

The Internal Epoxy Coated Steel Pipe is a high-performance piping solution engineered to combine the structural strength of steel with the chemical resistance and hygiene of an epoxy lining. This product features a steel pipe (seamless or welded) with a specialized Fusion Bonded Epoxy (FBE) or liquid epoxy coating applied strictly to the interior surface. This lining acts as a permanent barrier, isolating the steel from the transported medium to prevent corrosion, scaling, and bacterial growth. It is the industry-preferred choice for potable water distribution, fire protection systems, and industrial fluid transport where flow efficiency and fluid purity are paramount.

Key Features and Benefits

• Corrosion & Scaling Prevention: The epoxy lining effectively isolates the steel from water, acids, alkalis, and salts, preventing rust and tuberculation (scaling). This ensures the pipe maintains its flow capacity over decades of use.

• Hydraulic Efficiency: The internal surface is extremely smooth (friction coefficient typically ~0.01), which significantly reduces fluid resistance. This "smooth bore" design improves flow capacity by approximately 15–20% compared to uncoated steel and reduces pumping energy costs.

• Hygienic & Non-Toxic: The epoxy materials used are typically compliant with GB/T 17219 and NSF/ANSI 61 standards. This ensures the lining is non-toxic, tasteless, and inhibits the growth of bacteria and biofilm, making it safe for drinking water.

• Chemical Resistance: The thermosetting epoxy resin offers excellent stability against chemical degradation, making it suitable for transporting various industrial fluids, including sewage and chemical slurries.

• Mechanical Durability: The steel base provides high tensile strength and impact resistance, allowing the pipe to withstand high pressure and heavy loads, unlike pure plastic alternatives.

Technical Specifications

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

• Base Pipe Materials:

• Seamless: ASTM A106, API 5L

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

• Galvanized (GI): Steel pipe with internal epoxy overcoat

• Lining Material: Thermosetting Epoxy Powder (FBE) or Liquid Epoxy.

• Lining Thickness:

• Standard: 200 µm – 500 µm (0.2mm – 0.5mm).

• Heavy Duty: >500 µm (for abrasive slurries).

• Operating Temperature: -30°C to +80°C (Standard); up to 100°C for specialized grades.

• Connection Types:

• Grooved (Victaulic): For rapid assembly.

• Flanged: For pump and valve connections.

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

• Welding: With field joint coating/repair.

Applications

Internal epoxy coated pipes are essential for systems requiring high purity and flow efficiency:

• Potable Water Supply: Municipal water transmission and building risers (prevents "red water" and maintains hygiene).

• Fire Protection: Sprinkler systems and fire mains (prevents blockage from rust/scale).

• Industrial Process: Transport of chemicals, acids, and alkalis.

• Mining: Slurry transport and tailings lines (resists abrasion and corrosion).

• HVAC: Chilled water and cooling water circulation systems.