Blue Epoxy Lined Steel Pipe

Blue Epoxy Lined Steel Pipe

Product Overview

The Blue Epoxy Lined Steel Pipe is a specialized piping solution designed primarily for potable water supply and municipal infrastructure. It consists of a high-strength steel pipe (seamless, welded, or spiral) coated internally—and often externally—with a layer of blue epoxy resin. The distinctive blue color serves as an industry-standard visual identifier for potable water systems, distinguishing it from red fire protection pipes or black oil/gas lines. This combination provides the mechanical durability of steel with the hygiene and corrosion resistance required for safe drinking water distribution.

Key Features and Benefits

• Potable Water Safety: The blue epoxy lining is typically certified to NSF/ANSI 61 or GB/T 17219 standards, ensuring it is non-toxic, tasteless, and safe for human consumption.

• Corrosion & Scaling Resistance: The epoxy barrier prevents rust and tuberculation (scale buildup) inside the pipe, maintaining water quality and preventing "red water" issues common in aging steel networks.

• High Flow Efficiency: The smooth internal surface (friction coefficient ~0.01) reduces hydraulic resistance, improving flow capacity and reducing pumping energy costs.

• Visual Identification: The Blue color (both internal and external) provides immediate visual confirmation that the pipe is intended for water service, simplifying installation and maintenance.

• Mechanical Strength: Unlike plastic pipes, the steel base withstands high pressure, heavy soil loads, and physical impact, making it suitable for deep burial and high-rise buildings.

Technical Specifications

• Product Name: Blue Epoxy Lined Steel Pipe (Water Grade)

• Base Pipe Materials:

• Seamless: ASTM A106, API 5L

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

• Ductile Iron: EN 545 / ISO 2531 (often with blue external epoxy finish)

• Lining Material: Fusion Bonded Epoxy (FBE) or Liquid Epoxy.

• Color: Blue (RAL 5005 or similar standard water blue).

• Lining Thickness:

• DN ≤ 65: >0.30 mm

• DN ≥ 80: >0.35 mm – 0.50 mm

• External Coating: Blue Epoxy, Polyethylene (PE), or Zinc + Blue Epoxy (for ductile iron).

• Operating Temperature: -30°C to +80°C.

• Connection Types:

• Grooved (Victaulic): For rapid assembly in fire/water systems.

• Flanged: For pump and valve connections.

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

• Welding: With field joint coating.

Applications

This pipe is the industry standard for water infrastructure:

• Municipal Water Supply: Main transmission lines for drinking water distribution.

• Building Services: Cold water risers and distribution networks in commercial and residential high-rises.

• Water Treatment Plants: Intake and discharge piping.

• Fire Protection: While often red, blue pipes are also used for the water supply feed to fire pumps.

• Industrial Water: Process water lines requiring corrosion resistance.