Home - News > Industry NewsIndustry News
Most common materials to coat pipes
Update:2019-08-21 View(s):1072 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:
Pipe Coating Type
|
Advantages
|
Disadvantages
|
Three-layer Polyethylene (3LPE) and 3 layers Polypropylene (3LPP)
|
Low material and application cost
|
-
Application of flame in pipeline environments has traditionally been the cause of workplace fires and explosions
-
Requires application of flame to create adhesion
-
Limited heat resistance.
-
Maximum 225°F to 250°F.
-
Limited dimensional stability
-
Features just a borderline hardness
-
Shows poor resistance to sulfur, amines, oxygen, and other oxidants.
|
Polypropylene (PUR)
|
Recommended for deep sea applications with relatively high temperature and pressures
|
Polypropylene is liable to chain degradation from exposure to heat and UV radiation such as that present in sunlight.
|
Fusion Bonded Epoxy (FBE)
|
Excellent chemical resistance and great dimensional stability with minimized hysteresis
|
-
Rather expensive application cost per meter
-
FBE materials are expensive
-
The pipe and the coating materials must be heated to approx 250°F
-
Long lead times
|
Asphalt enameled and polyurethane (PUR)
|
Cheap and superior to coal enamelReduces the hysteresis
Fast treatment
|
-
Modest resistance to chemical aggression
-
Strict temperature ranges
-
Limited dimensional stability
|