Exactly what does Three-Layer Extruded Polyethylene Coating (3LPE) Mean?
A three-layer extruded polyethylene coating (3LPE) consists of extruded, three-layer, anti-corrosive steel pipe coatings. These layers in this kind of coating consist of:
Bonding agent or copolymer layer
Epoxy layer
Polypropylene or polyethylene layer
Corrosionpedia Explains Three-Layer Extruded Polyethylene Coating (3LPE)
A three-layer extruded polyethylene coating is used for several varieties of pipelines including sewer systems, water pipelines, gas pipelines and also other channels which might be dangerous to water. Polyethylene coatings come in use to protect buried pipelines from corroding because the 1950s. This type of coating provides higher potential to deal with insulation than bitumen coatings.
A three-layer extruded polyethylene coating is true through sight extrusion and sleeve extrusion. Those two ways of applying polyethylene coating were introduced within the 1960s, replacing the sintering technique. It turned out from the 1980s when 3LPE became very prevalent on the market.
One good thing about this coating material is that it must be ultra-adhesive, even at 70 degrees. Also, it could be easily reduce as necessary by having the pipelines heated. Furthermore, these toppers includes a very good chemical resistance that means it is applicable even just in one of the most aggressive environments, including all types of soil.
Mit resistance on this coating prevents its corrosion. However, it should be noted that simply like many materials, it is usually at risk of some kinds of corrosion. For that reason, as early as 1974, testing continues to be needed to determine the aging or corrosion resistance of 3LPE. This is conducted by measuring the temperature with the use of a thermometer at 140°F (60°C). The measure of aging is the melt index, that is set at an initial price of 25%. Over time, more advanced testing methods happen to be developed to determine the 3LPE’s aging and resistance to corrosion.
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