What Does Three-Layer Extruded Polyethylene Coating (3LPE) Mean?

A three-layer extruded polyethylene coating (3LPE) is composed of extruded, three-layer, anti-corrosive steel pipe coatings. The 3 layers in this kind of coating incorporate:

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 types of pipelines including sewer systems, water pipelines, gas pipelines and also other channels which are dangerous to water. Polyethylene coatings will be in use to guard buried pipelines from corroding since the 1950s. This sort of coating provides higher capacity insulation than bitumen coatings.

A three-layer extruded polyethylene coating is true through sight extrusion and sleeve extrusion. Those two types of applying polyethylene coating were introduced within the 1960s, replacing the sintering technique. It turned out within the 1980s when 3LPE became very prevalent on the market.

One benefit of this coating material is it is ultra-adhesive, even at room temperature. Also, it may be easily scale back as necessary insurance firms the pipelines heated. Furthermore, this material has a very strong chemical resistance which make it applicable even during one of the most aggressive environments, including all kinds of soil.

Mit resistance of this coating prevents its corrosion. However, it needs to be noted that simply like many materials, it is usually at risk of particular sorts of corrosion. For that reason, as early as 1974, testing may be required to determine the maturing or corrosion resistance of 3LPE. That is conducted by measuring the temperature if you use a thermometer at 140°F (60°C). The way of measuring aging may be the melt index, which is set within an initial value of 25%. Over the years, more complex testing methods are already made to determine the 3LPE’s aging and effectiveness against corrosion.

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