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High-Performance 3LPP Coated Steel Pipe from China Suppliers and Factory - Thermal Resistance Up to 140°C
Detailed Description of 3LPP Coated Steel Pipe
The 3LPP coating system offers a pipeline protection solution based on 3LPE technology tailored for elevated temperature situations and claims the same construction scheme as 3LPE but with the outer layer being polypropylene (PP). PP is ideally suited for high temperature pipeline service because of its excellent mechanical properties and temperature resistance. With that, it is the camera in hot oil or steam pipelines and pipelines crossing high temperature areas (i.e. deserts or geothermal).
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● Layer 1: Fusion Bonded Epoxy (FBE) Primer
Provides corrosion prevention as well as superb adhesion to steel.
Provides corrosion prevention as well as superb adhesion to steel.
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● Layer 2: Copolymer Adhesive
The adhesive used to bond the FBE primer to the PP topcoat.
The adhesive used to bond the FBE primer to the PP topcoat.
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● Layer 3: Polypropylene (PP) Top Coat
Corrosion resistant, high temperature resistance, high hardness, high abrasion resistance. Also provides protection against mechanical damage.
Corrosion resistant, high temperature resistance, high hardness, high abrasion resistance. Also provides protection against mechanical damage.
Key Parameters
| Parameter | Details |
|---|---|
| Coating Structure | FBE Primer + Adhesive Layer + PP Top Coat |
| Executive Standards | ISO 21809-1, DIN 30678, EN10286 |
| Total Coating Thickness | 1.8 – 4.5mm (or as per project/standard requirements) |
| Hardness | Shore D Hardness ≥ 60 |
| Vicat Softening Point | ≥ 140°C |
| Tensile Strength | ≥ 20 MPa |
Frequently Asked Questions
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What is 3LPP coated steel pipe and how does it differ from 3LPE?
3LPP (Three-Layer Polypropylene) coated steel pipe shares the same three-layer construction as 3LPE — FBE primer, copolymer adhesive, and a polymer topcoat — but replaces polyethylene with polypropylene as the outer layer. This substitution gives 3LPP superior heat resistance, making it the preferred choice for high-temperature pipeline applications where 3LPE would soften or degrade.
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What temperature range is 3LPP coating suitable for?
3LPP coated steel pipes are designed for elevated temperature service. Thanks to the polypropylene topcoat's Vicat Softening Point of ≥ 140°C, these pipes are well-suited for hot oil pipelines, steam lines, and installations in high-temperature environments such as deserts or geothermal areas — typically handling operating temperatures significantly higher than standard 3LPE systems.
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Which international standards govern 3LPP coated steel pipes?
3LPP coated steel pipes are manufactured and tested in accordance with internationally recognized standards, including ISO 21809-1, DIN 30678, and EN 10286. These standards specify requirements for coating structure, thickness, adhesion, mechanical properties, and quality assurance, ensuring reliable performance in demanding pipeline projects worldwide.
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What is the typical coating thickness for 3LPP pipes?
The total coating thickness for 3LPP coated steel pipes typically ranges from 1.8mm to 4.5mm, depending on the pipe diameter, project specifications, and applicable standards. Custom thicknesses can be produced to meet specific engineering or environmental requirements upon request.
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What are the main advantages of the polypropylene (PP) topcoat in 3LPP pipes?
The polypropylene topcoat in 3LPP pipes delivers multiple performance benefits: excellent resistance to high temperatures, outstanding corrosion protection, high surface hardness (Shore D ≥ 60), and strong abrasion resistance. These properties make 3LPP pipes highly durable in mechanically demanding and chemically aggressive environments, reducing maintenance costs and extending service life.
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In what industries or applications are 3LPP coated steel pipes commonly used?
3LPP coated steel pipes are widely used in industries where pipelines are exposed to elevated temperatures or harsh environmental conditions. Common applications include oil and gas transmission (hot crude oil, steam injection), geothermal energy projects, pipelines routed through desert regions, offshore subsea pipelines, and chemical processing facilities requiring both thermal and corrosion resistance.