High-Temperature 3LPP Coated Steel Pipe
Our 3LPP (3-Layer Polypropylene) Coated Steel Pipes are engineered for high-temperature fluid transportation in demanding environments. Featuring a triple-layer protective system (FBE, Adhesive, and PP), these pipes offer superior mechanical protection and exceptional thermal stability, capable of withstanding operating temperatures from 110°C up to 140°C.
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Coating Layers: Fusion Bonded Epoxy (FBE) + Copolymer Adhesive + Polypropylene (PP).
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Operating Temp: -20°C to +110°C (Standard) / Up to +140°C (Special).
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Size Range: 1/2″ to 100″ (DN15 – DN2500).
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Key Standards: DIN 30678, ISO 21809-1, CAN/CSA Z245.20/21.
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Applications: High-temperature oil & gas pipelines, desert regions, and offshore subsea lines.
Description
1. Product Introduction
3LPP Coated Pipe is a multilayer coating system consisting of three functional components: a high-performance fusion bonded epoxy (FBE), followed by a copolymer adhesive, and an outer layer of polypropylene (PP). This system provides excellent corrosion resistance and mechanical protection.
While 3LPE (Polyethylene) is commonly used for standard temperatures, 3LPP is the superior choice for high-temperature environments. It is specifically designed for pipelines where the operating temperature exceeds the limits of polyethylene, typically handling 110°C to 140°C.
2. 3LPP Coating Layers Structure
The three-layer system ensures a permanent bond to the steel surface and a rugged shield against the environment:
- Layer 1: Fusion Bonded Epoxy (FBE): This initial layer provides excellent adhesion to the steel and outstanding chemical and cathodic disbondment resistance.
- Layer 2: Copolymer Adhesive: Acts as a bonding bridge, providing high chemical adhesion between the FBE primer and the top PP layer.
- Layer 3: Polypropylene (PP): The outermost layer provides superior mechanical protection against impact, abrasion, and moisture. It is particularly resistant to high soil stress and heat.
3. Executive Standards & Steel Grades
| Coating Standard | Base Pipe Standards |
|---|---|
| DIN 30678 (Polypropylene Coatings) | API 5L (Gr. B, X42, X46, X52, X56, X60, X65, X70, X80) |
| ISO 21809-1 | ASTM A53, ASTM A106, ASTM A333 |
| CAN/CSA Z245.20 / Z245.21 | EN 10219, EN 10210, EN 10217 |
| NF A49-710 | GB/T 3091, GB/T 9711 |
| Shell DEP 31.40.30.31 | AS/NZS 1163 |
4. Technical Specifications
| Parameter | Specification Range |
|---|---|
| Outer Diameter (OD) | 1/2″ – 100″ (21.3mm – 2540mm) |
| Wall Thickness (WT) | 2.0mm – 60mm |
| Pipe Length | Up to 18 meters |
| Operating Temperature | -20°C to +110°C / +140°C |
| Adhesion Strength | ≥ 15 MPa |
| Min. Coating Thickness | Standard: 1.8mm – 4.7mm (depending on OD) |
5. Manufacturing Process Flow
Our 3LPP coating line utilizes a continuous extrusion process to ensure uniform coverage and bonding:
Technical Workflow: Pre-heating → Shot Blasting → Induction Heating → FBE Spray → Adhesive Extrusion → PP Wrapping → Water Cooling
6. Key Features & Applications
Features:
- High Heat Resistance: Superior to 3LPE, making it suitable for hot climate zones and high-temperature oil transport.
- Mechanical Strength: High resistance to penetration, abrasion, and environmental stress cracking.
- Chemical Stability: Excellent resistance to acids, alkalis, and salts.
Applications:
- High-temperature oil and gas transmission pipelines.
- Subsea pipelines and offshore platforms.
- Pipelines buried in desert or high-soil-temperature environments.
- Wastewater and chemical transport systems.