High-Performance Polypropylene Coating Production Line (3LPP) for Steel Pipes

The Polypropylene (PP) Coating Production Line for Steel Pipes (3LPP) is an advanced anti-corrosion solution designed to provide superior protection for pipelines operating in harsh environments. Widely used in the oil & gas, petrochemical, offshore, and high-temperature transmission industries, the 3LPP system offers exceptional mechanical strength, chemical resistance, and long-term durability.

Compared to traditional coating systems, 3LPP technology delivers enhanced performance at elevated temperatures (up to 110°C and beyond), making it the ideal choice for demanding pipeline projects where reliability and longevity are critical.

• High temperature resistance (up to 110°C or higher)
• Excellent mechanical and impact strength
• Superior resistance to corrosion, chemicals, and abrasion
• Long service life with minimal maintenance
• Strong adhesion and coating integrity
• Suitable for offshore and harsh environmental conditions

• Oil & gas transmission pipelines
• Offshore and subsea pipelines
• Petrochemical industries
• Hot fluid transportation systems
• Desert and high-temperature environments

• Fusion Bonded Epoxy (FBE) Layer
  • Provides excellent adhesion to the steel surface
  • Offers primary corrosion protection
• Adhesive Layer (Copolymer)
  • Ensures strong bonding between FBE and PP top layer
  • Enhances overall coating integrity
• Polypropylene (PP) Top Layer
  • Delivers high mechanical strength and impact resistance
  • Provides outstanding resistance to abrasion, chemicals, and high temperatures

Upload pipes → Pipes Conveyor → Rust Removal by Shot-blasting → Intermediate Frequency Heating → Epoxy Powder Coating → Adhesive Coating → Polypropylene Wrap → Water cooling → Pipe Edge Beveling → Unload pipes.

1. Surface Preparation (Shot Blasting)
   Steel pipes are cleaned to Sa2.5/Sa3 standard to remove rust, scale, and contaminants, ensuring optimal coating adhesion.
2. Induction Heating
   Pipes are heated to the required temperature to facilitate proper FBE application.
3. FBE Powder Coating
   Electrostatic spraying applies a uniform epoxy layer onto the pipe surface.
4. Adhesive Application
   A copolymer adhesive layer is extruded or sprayed over the FBE layer.
5. Polypropylene Extrusion Coating
   The outer PP layer is applied through extrusion, forming a thick, durable protective shell.
6. Cooling System
   Pipes pass through controlled cooling (water or air) to stabilize the coating layers.
7. Inspection & Quality Control
   Includes thickness measurement, holiday detection, adhesion testing, and visual inspection.
8. Marking & Handling
   Finished pipes are marked, conveyed, and prepared for storage or shipment.

Qingdao Huashida Machinery Co., LTD is a manufacturer of series of plastic pipe machines, municipal pipe machines, pipe insulation & anticorrosion machines, and pipe jointing & anticorrosion materials, with more than 20 years of production experience.

• HDPE jacket pipe for pre-insulated pipe Production Line (110-2000mm)
• Rigid pre-insulated pipe Production Line
• Flexible pre-insulated pipe (PERT) production line
• Steel pipe FBE/2LPE/3LPE/2LPP/3LPP anti-corrosion coating line
• Steel pipe derusting line
• PE pressure pipe/Water Gas supply pipe production line
• PP/PE plastic board/sheet/geomembrane production line
• NBR PVC Thermal insulation tube/plate production line
• Pipeline anti-corrosion materials and instruments: heat shrink joint coating sleeve, electro-fusion weldable joint sleeve, portable welding gun (extruder), PE PP welding rod

We are always attaching great importance to research and development, collaborating closely with Tsinghua University, Beijing University of Chemical Technology, South China University of Technology and scientific research institutions. By absorbing advanced technology home and abroad, we now rank one of the top 3 manufacturers in the industry in China.

We have been working with more than 400 overseas customers and exporting our products to Kazakhstan, Uzbekistan, Middle East, Russia, Nigeria and other countries.