Engineered Protective Coating Systems
Applied in accordance with ISO 21809-1, DIN 30670, and AWWA standards to maximize pipeline service life in extreme onshore and offshore operating environments.
3LPE (3-Layer Polyethylene)
- FBE fusion primer for chemical bonding
- Grafted copolymer adhesive tie-layer
- High-density polyethylene (HDPE) mechanical outer shield
- Superior resistance to soil stress & moisture permeation
3LPP (3-Layer Polypropylene)
- High operating temperature rating up to 140°C
- Exceptional penetration & impact resistance
- Preferred for deepwater subsea oil & gas lines
- Outstanding resistance to high-salinity seawater
Fusion Bonded Epoxy (FBE)
- Electrostatic application on induction heated steel
- Superior cathodic disbondment resistance
- Dual-layer ARO (Abrasion Resistant Overcoat) available
- Ideal for directional drilling (HDD) crossings
Internal Liquid Epoxy Flow Liner
- Ultra-smooth internal surface reduces pipeline friction factor
- Increases gas transmission throughput by 3-5%
- Solvent-free food-grade epoxy for potable water mains
- Prevents internal pit corrosion and product contamination
Concrete Weight Coating (CWC)
- Negative buoyancy ballast for submarine pipelines
- High-density heavy aggregate concrete mix
- Galvanized wire-mesh reinforcement cage
- Protects anti-corrosion barrier from anchor dragging
Hot Dip Galvanizing (HDG)
- Full immersion molten zinc metallurgical bond
- Self-healing galvanic sacrificial protection
- Decades of maintenance-free structural life
- Complete coverage on internal and external surfaces
5-Stage Automated Coating Process
Controlled continuous conveyor application ensuring flawless substrate bonding and zero holiday defects.
Surface Blasting to Sa 2.5
Centrifugal wheel and air abrasive grit blasting to remove all mill scale, oxides, and rust, producing a 50–100 µm anchor pattern for mechanical adhesion.
Induction Preheating (230°C)
Medium frequency induction coils uniformly heat the pipe body to 220°C–240°C, monitored by dual optical infrared pyrometers.
Automated Multi-Layer Extrusion
Electrostatic spray of thermoset FBE primer (150 µm) followed immediately by crosshead extrusion of copolymer adhesive and HDPE/PP outer jacket.
Water Quench & Sizing
Multi-stage recirculated cold water quenching ring locks coating crystallization and cools the pipe to handling temperature.
100% Spark & NDT Inspection
Continuous inline high-voltage holiday detection (up to 25 kV), ultrasonic dry film thickness (DFT) mapping, and peel strength testing.
Coating Systems Technical Comparison Matrix
Select the optimal anti-corrosion barrier based on operating temperature and installation terrain.
| Coating System | Max Temp | Soil Stress | Impact Strength | Applicable Standard | Primary Application |
|---|---|---|---|---|---|
| 3LPE Coating | 80°C | Excellent | Very High | DIN 30670 / ISO 21809-1 | Buried Oil & Gas, Water Mains |
| 3LPP Coating | 140°C | Superior | Maximum | ISO 21809-1 / DIN 30678 | Deepwater Subsea, High-Temp Crude |
| Single Layer FBE | 110°C | Good | High | AWWA C213 / API 5L7 | Plant Piping, In-Trench Pipelines |
| Dual Layer FBE (ARO) | 110°C | Very Good | Superior | CSA Z245.20 / NACE SP0394 | HDD River Crossings, Rocky Soil |
| Internal Liquid Epoxy | 90°C | N/A (Internal) | High Adhesion | API RP 5L2 / AWWA C210 | Gas Flow Efficiency, Potable Water |
| Concrete Weight (CWC) | Submarine | Maximum | Armored | ISO 21809-5 / DNV-RP-F106 | Subsea Stability, River Crossings |
Factory-Coated Tubular Supply
Supplied with bare end cutbacks ready for field welding and heat-shrink sleeve joint protection.
3LPE Coated Line Pipe (API 5L X52 / X65)
Dual-Layer FBE Plant Piping (350-500µm)
Internal Epoxy Lined Water Transmission Pipe
Frequently Asked Questions on Pipeline Coating Systems
Key engineering, tolerance, and international compliance answers from our metallurgical quality desk.
FBE (Fusion Bonded Epoxy) is a single or dual-layer thermoset powder (350-500 µm) providing excellent chemical bonding and cathodic disbondment resistance. 3LPE (3-Layer Polyethylene) combines an FBE primer, a copolymer adhesive, and an outer HDPE jacket (1.8-4.7mm) providing superior mechanical impact and soil stress protection for long-distance buried pipelines.
Request Project Quotation for Factory-Coated Steel Pipes (3LPE / 3LPP / FBE)
Submit your required sizes, wall thicknesses, material grades, and total tonnage. Our technical sales engineers respond with complete mill pricing and lead times within 24 hours.