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Most common materials to coat pipes
Update:2019-08-21 View(s):1101 Keywords :anti-corrosion steel pipe, spiral steel pipe, spiral pipes
The most common materials to coat pipes externally are:
Non-metallic pipe coating: Paints, varnishes, lacquers, bituminous coatings, resins, plasticizers, Greases, waxes, oils, Plastics (polyurethane, polyethylene, Rilsan, PTFE, PVC), Elastomers (various types), Vitreous enamel, Cement mortar.
Organometallic pipe coating: Paints pigmented with metals in powder form (aluminum, zinc, lead, stainless steel), Paints containing zinc ethyl-silicate.
Chemical modification: Phosphating, Chromatin, phosphating, Black finishing, and browning.
Cementation (physiochemical modification)
The main types of non metallic pipe coating materials, and their advantages/disadvantages, are summarized in the table below:
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Pipe Coating Type
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Advantages
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Disadvantages
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Three-layer Polyethylene (3LPE) and 3 layers Polypropylene (3LPP)
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Low material and application cost
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Application of flame in pipeline environments has traditionally been the cause of workplace fires and explosions
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Requires application of flame to create adhesion
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Limited heat resistance.
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Maximum 225°F to 250°F.
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Limited dimensional stability
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Features just a borderline hardness
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Shows poor resistance to sulfur, amines, oxygen, and other oxidants.
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Polypropylene (PUR)
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Recommended for deep sea applications with relatively high temperature and pressures
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Polypropylene is liable to chain degradation from exposure to heat and UV radiation such as that present in sunlight.
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Fusion Bonded Epoxy (FBE)
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Excellent chemical resistance and great dimensional stability with minimized hysteresis
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Rather expensive application cost per meter
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FBE materials are expensive
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The pipe and the coating materials must be heated to approx 250°F
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Long lead times
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Asphalt enameled and polyurethane (PUR)
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Cheap and superior to coal enamelReduces the hysteresis
Fast treatment
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Modest resistance to chemical aggression
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Strict temperature ranges
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Limited dimensional stability
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Threeway Steel is known as a professional supplier engaged in manufacturing and distributing a wide range of steel pipe, and our headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
