Extruded polyethylene coating for seamless, spiral welded, and longitudinal welded pipes

Our three-layer extruded polyethylene coating system offers premium anti-corrosion protection for steel pipes — whether seamless (SMLS), spiral welded (SAWH), or longitudinal welded (LSAW). The process is fully automated and strictly monitored to meet the highest industry standards.

Coating Process Overview:

1. Surface Preparation and Cleaning

• Exterior cleaning and surface preparation.
• Interior pipe cleaning using high-pressure air blasting.

2. Application of the Three Coating Layers

Layer 1 – Fusion Bonded Epoxy (FBE)

• Electrostatic spray (Nordson system) on pipes preheated to 165–220°C.
• Continuous temperature monitoring via optical pyrometer and contact thermometer.
• Dry and wet film thickness checked regularly according to PTI.

Layer 2 – Adhesive Layer

• Flat die extrusion of adhesive film, pressed onto the FBE layer with a pressure roller.
• Application timing optimized based on material specifications.
• Melting temperature maintained between 200–230°C.

Layer 3 – Polyethylene (PE) Layer

• Extruded PE film applied and pressed with a special roller over the adhesive.
• Thickness applied as specified in technical standards (typically 190–240°C).

3. Cooling & Quality Control

• Final pipe cooling in a water bath to ensure safe handling and coating integrity.
• Post-cooling, a continuity detector checks coating uniformity.
• Audio-visual alarms are triggered in case of any defects.