Automatic 3LPE Coating Pipe Production Line with PLC Control System for 50-4200mm Anti-Corrosion Steel Pipes

The 3LPE (Three-Layer Polyethylene) system is a multi-layered coating designed to provide industry-leading corrosion resistance and mechanical durability for buried steel pipelines.

• First Layer (Inner): Fusion-Bonded Epoxy (FBE) - Provides a strong chemical bond to the steel and serves as the primary defense against corrosion.
• Second Layer (Middle): Copolymer Adhesive - Acts as the "glue" that chemically bonds the epoxy layer to the outer polyethylene.
• Third Layer (Outer): High-Density Polyethylene (HDPE) - Provides rugged mechanical protection against impact, moisture, and environmental stress.

The 3LPE coating line is essential for infrastructure projects, including:

• Energy: Long-distance oil and gas transportation and urban gas networks
• Utilities: Municipal water supply systems
• Industrial: Specialized fluid pipelines for chemical and manufacturing sectors

The manufacturing process is divided into four critical stages:

Essential for preparing the steel surface to ensure maximum adhesion.

• Pipe wheel conveyors and Shot Blasting Machines
• Environmental controls (Cyclone & Pulse dust collectors)

The core of the application process.

• Induction heating devices for pipe preparation
• Powder spraying for the FBE layer
• SJ-Series Extruders and molds for the adhesive and PE sheet application

• Loading, downloading, and storage platforms
• Cooling Spray equipment to set the coating

• PE Beveling Machines for pipe-end finishing
• Integrated PLC automatic control systems for the entire line