3LPE Pipe Coating Line for Oilfield Pipelines with External Shot Blasting Cleaning

A fully automatic three-layer polyethylene (3LPE) coating system for factory-applied external anti-corrosion protection of steel pipe used in oilfield pipelines and wider oil and gas projects.

Covering a 36–4200 mm diameter range, this steel pipe coating machine combines external shot blasting cleaning, medium-frequency induction heating and one-pass 3LPE coating for oilfield gathering lines, crude oil and gas transmission pipelines, urban gas distribution and municipal water supply.

Built for pipe coating plants, pipe mills and pipeline contractors, this oilfield pipeline coating equipment runs the full external process in one workflow: Sa2.5 pipe shot blasting cleaning, ±2°C induction heating, electrostatic FBE epoxy powder coating, hot melt adhesive extrusion, outer PE cladding, water spray cooling, pipe end beveling, dust collection with powder recovery and full PLC automatic control. The FBE base, adhesive layer and PE protective layer form together at up to 250 m²/h sustained capacity.

The line also supports 2LPE, 2LPP and single-layer FBE coating, so one pipe coating production line investment can serve changing pipe sizes and contract specifications. The 3LPE coating meets DIN 30670 and BS EN 10329 requirements for long-service buried steel pipelines in oil and gas pipeline coating projects.

• Layer 1 — FBE Epoxy Base Layer: Fusion bonded epoxy (FBE) powder is applied to the shot blasted pipe surface and cures into a dense, cross-linked film. It delivers strong adhesion, acid and alkali resistance and cathodic disbondment resistance — the key performance requirement for anti-corrosion pipe coating on buried oilfield and gas pipelines.
• Layer 2 — Polymer Adhesive Middle Layer: Hot melt adhesive is applied over the FBE before it fully gels, bonding the epoxy base and the polyethylene outer layer into one structure and resisting delamination in soil and groundwater.
• Layer 3 — HDPE Outer Protective Layer: High-density polyethylene adds impact resistance, abrasion protection and a waterproof barrier against soil stress, completing the 3LPE coating system.

• External Shot Blasting Cleaning: The integrated external shot blasting machine reaches Sa2.5 cleanliness on the pipe outer wall — the surface grade FBE and 3LPE coating need for lasting adhesion.
• Built for Oilfield Pipelines: Full 3LPE protection resists soil corrosion, moisture and impact on buried gathering lines and crude oil and gas transmission pipes.
• Ultra-Wide 36–4200 mm Coverage: One steel pipe coating machine configuration handles small-bore gathering lines through large-diameter transmission pipelines.
• Medium-Frequency Induction Heating: ±2°C accuracy gives uniform FBE melting and firm layer bonding with lower power consumption than conventional heating.
• PLC Automatic Control: Stable coating thickness, lower labor cost and output of up to 250 m²/h for high-volume pipe coating contracts.
• Clean, Compliant Production: Cyclone and pulse dust collectors with powder recovery meet CE and ISO14001 environmental standards.

Main equipment of the 3PE anti-corrosion coating processing line:

The line applies composite 3LPE coating and also supports 2LPE, 2LPP and single-layer FBE coating. This pipeline coating equipment adapts to oilfield pipelines, oil and gas transmission, municipal water supply, urban gas networks, offshore pipeline construction and large EPC projects across the full 36–4200 mm diameter range.

The induction heating system holds ±2°C accuracy with lower power consumption, so FBE powder melts evenly and the 3LPE layers bond firmly. An adjustable spiral conveyor speed (0–6 m/min) fits each pipe diameter, keeping capacity up to 250 m²/h and coating quality consistent through continuous pipe coating production line runs.

Cyclone and pulse dust collectors with a powder recovery system meet CE and ISO14001 environmental standards. Low dust emission supports clean workshop conditions and green manufacturing for international EPC projects.

We have completed 50+ steel pipe coating line projects at home and abroad, with equipment installed and running in oilfield, oil and gas, municipal water supply and EPC infrastructure projects across Russia, Iran, the United Arab Emirates, India, Belarus, Kazakhstan and more.

Our History: Qingdao Huashida Machinery Co., Ltd. was established in 2003. For over 20 years, Huashida has focused on R&D and production of 3PE steel pipe anti-corrosion coating lines, steel pipe FBE/2LPE/3LPE coating systems, polyurethane insulation pipe production lines, large-diameter underground pipeline equipment and plastic pipe fitting production machinery. We maintain long-term technical cooperation with Tsinghua University, Beijing University of Chemical Technology, South China University of Technology and other national research institutions. By integrating advanced global technologies and international standards, we have become a leading pipeline coating equipment manufacturer in China.