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3LPP Coated Steel Pipe Suppliers in China - High-Performance Polypropylene Coating Factory
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3LPP Coated Steel Pipe Suppliers in China - High-Performance Polypropylene Coating Factory

The 3LPP (Three-Layer Polypropylene) coating system is an advanced, high-performance solution specifically engineered for high-temperature applications. This innovative coating consists of three distinct layers: a fusion bonded epoxy (FBE) primer, a robust adhesive copolymer layer, and a resilient polypropylene topcoat. Unlike standard 3LPE systems, the 3LPP system offers superior thermal resistance, making it an ideal choice for demanding environments.

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Details

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Product Name

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3LPP Coated Steel Pipe

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Coating Standard

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ISO 21809-1, DIN 30678, EN10286

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Base Pipe

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ERW, LSAW, SSAW, Seamless Pipe

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Coating Thickness

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Typically 1.8mm - 4.5mm

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Operating Temp

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Up to 110°C (230°F), with some applications up to 140°C (284°F)

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    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.

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    Layer 2: Copolymer Adhesive

    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.

    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 (FAQ)

    Q
    What is 3LPP coated steel pipe and how does it differ from 3LPE?
    3LPP (Three-Layer Polypropylene) coated steel pipe uses the same three-layer construction as 3LPE — FBE primer, adhesive layer, and outer topcoat — but replaces polyethylene with polypropylene as the outer layer. This substitution gives 3LPP superior performance at elevated operating temperatures, making it the preferred choice for high-temperature pipeline applications.
    Q
    What temperature range is 3LPP coated pipe suitable for?
    3LPP coated steel pipe is designed for high-temperature service environments. The polypropylene outer layer has a Vicat Softening Point of ≥ 140°C, making it suitable for hot oil pipelines, steam transport lines, and pipelines routed through high-temperature zones such as deserts or geothermal areas.
    Q
    What international standards does 3LPP coated pipe comply with?
    3LPP coated steel pipes are manufactured in compliance with internationally recognized standards including ISO 21809-1, DIN 30678, and EN10286. These standards ensure consistent coating quality, adhesion performance, and mechanical properties across all production batches.
    Q
    What is the typical coating thickness for 3LPP coated steel pipe?
    The total coating thickness for 3LPP coated steel pipe typically ranges from 1.8mm to 4.5mm. The exact thickness can be customized based on specific project requirements, pipeline operating conditions, or applicable industry standards specified by the client or engineering team.
    Q
    What are the key mechanical properties of the 3LPP outer layer?
    The polypropylene (PP) top coat in a 3LPP system delivers excellent mechanical performance, including a Shore D Hardness of ≥ 60, a Tensile Strength of ≥ 20 MPa, and a Vicat Softening Point of ≥ 140°C. These properties ensure the coating withstands mechanical impacts, abrasion, and high-temperature operating conditions effectively.
    Q
    What role does the FBE primer play in the 3LPP coating system?
    The Fusion Bonded Epoxy (FBE) primer serves as the first and foundational layer in the 3LPP coating system. It bonds directly to the steel pipe surface, providing primary corrosion protection and creating a strong adhesive base for the subsequent copolymer adhesive layer and polypropylene topcoat. Its performance is critical to the overall longevity and integrity of the coating system.