Plastic Coated Steel Pipe (for Water Supply)

Plastic Coated Steel Pipe (for Water Supply)
Plastic Coated Steel Pipe (for Water Supply)
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    Standard:
    CJ/T120-2008: Specification for steel water pipe with plastic coating

    Applications
    The plastic coated steel pipe is used for building drainage and water supply, hot and cold water transportation in enterprise and residential communities, industrial circulating water transportation, and transportation of various fluids such as fire-extinguisher fluid, gas, oil, chemicals, etc. with excellent resistance to corrosion, UV, static and fire.

    Materials & Grades:
    Steel grade: S185, S235, S355; SS330, SS400, SM490
    Coating materials: PE, Epoxy resin EP

    Specification
    Nominal Outside Diameter: ≥DN25mm

    Main Technical Indexes:
    1. Introduction
    The plastic coated steel pipes are manufactured from common hot dip galvanized pipes or welded pipes lined or coated with polyethylene or epoxy powder under high temperature and high pressure. They combine the advantages of steel pipes and plastic pipes. According to materials, they are suitable for use under a temperature range of -30℃-95℃. The composite pipes comply with the standards of GB/T 17219 and GB5749-2006.

    2. Properties
    1) Outstanding corrosion resistance: Plastic coating and lining can effectively isolate the fluid from the steel pipe, thus ensuring great anti-corrosion performance and prolonging pipe's service life.
    2) Superior mechanical strength: Although coated with a layer of plastic, the pipe comes with the same mechanical strength as steel pipe, allowing for a strong bearing capability to impact, bending and pressing. (Working pressure≤5.0MPa)
    3) High hygienic property: Due to use of food grade epoxy resin or polyethylene, the hygienic property of the plastic-coated steel pipe is up to the national standard.
    4) Small fluid resistance: Smooth inner wall results in small friction coefficient and fast flow without scaling

    3. Coating Thickness
    Nominal outside diameter DN Inner wall coating thickness mm Outer wall coating thickness mm
    Polyethylene Epoxy powder Polyethylene Epoxy powder
    Common Reinforced Common Reinforced
    25 > 0.4 > 0.3 > 0.5 > 0.6 > 0.3 > 0.35
    32
    40
    50
    65
    80 > 0.5 > 0.35 > 0.6 > 1.0 > 0.35 > 0.4
    100
    125
    150
    200 > 0.6 > 0.8 > 1.2
    250
    300
    350 > 0.8 > 1.3 > 0.35 > 0.4
    400
    500
    550-750 > 0.8 > 0.4 > 1.0 > 1.5 > 0.4 > 0.45
    800-1200 > 1.0 > 0.45 > 1.2 > 1.8 > 0.45 > 0.5
    4. Polyethylene Powder Properties
    Items Index Testing method
    Density/ g/cm3 > 0.91 GB/T1033
    Tensile strength / MPa > 9.80 GB/T1040
    Elongation at break/ % > 300 GB/T1040
    Vicat softening point/ ℃ > 85 GB/T1633
    Non-volatile matter content / % > 99.5 GB/T2914
    Hygienic property Comply with GB/T 17219 standard
    5. Epoxy Powder Property
    Items Index Testing method
    Density /(g/cm3) 1.3-1.5 GB/T 1033
    Size distribution / % Plus sieve: 150μm≤3;
    Minus sieve: 550μm≤0.2
    GB/T 6554
    Non-volatile matter content / % ≥99.5 GB/T 6554
    Horizontal fluidity / mm 22-28 GB/T 6554
    Gelling time / s ≤120 (200 ℃) GB/T 6554
    Impact strength / (Kg.mm) ≥50 GB/T 1732
    Bending test / (¢ 2mm) Pass GB/T 6742
    Hygienic property Comply with GB/T 17219 standard

    6. Good Performance in Hydraulic Test:
    Our plastic-coated steel pipes go through the hydraulic test and perform well. Based on the standard of GB/T3091-2008 and counting on P=2ST/D,the maximum testing pressure is 5.0Mpa.

    7. Attentions
    1) Working pressure is not more than the nominal pressure of pipe.
    2) Heating is forbidden to bend the plastic-coated steel pipe.
    3) The pipes should be stored flatwise in cool place or indoor area, away from heat source and fire. They can not be placed in the direct sunlight and freezing environment. Rain cover should be used if the pipes are stored in open air.

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