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Comparison of plastic coated steel pipe and 3PE anti-corrosion steel pipe


plastic coated steel pipes, also known as plastic coated steel pipes, steel-plastic composite pipes, and plastic-coated composite steel pipes, are based on steel pipes, and use pe (modified polyethylene) for hot-dip molding or ep (epoxy resin) as the main anti-corrosion raw materials. the steel-plastic composite steel pipe is welded with a pe anti-corrosion layer on the inner surface of the steel pipe (bottom pipe) or welded with an ep anti-corrosion layer on the inner and outer surfaces by spraying, rolling, dipping, and suction processes. plastic-coated steel pipes have excellent corrosion resistance. at the same time, the coating itself also has good electrical insulation and will not cause galvanic corrosion. low water absorption, high mechanical strength, and small friction coefficient can achieve the purpose of long-term use. it can also effectively prevent damage to plant roots and soil environmental stress.

advantages of plastic-coated steel pipe:

1. adapt to the buried and humid environment, and can withstand high temperatures and extremely low temperatures.

2. strong anti-interference ability, if the plastic-coated steel pipe is used as a cable casing, it can effectively shield the external signal interference.

3. good pressure strength, the pressure can reach 6mpa.

4. the insulation performance is good, and the protection tube of the wire will never cause leakage.

5. no burr, smooth pipe wall, suitable for wearing wires or cables during construction.

application field of plastic-coated steel pipe

1. various forms of circulating water systems (civil circulating water, industrial circulating water).

2. fire water supply system.

3. water supply and drainage of each building.

4. various chemical fluid transportation (this product is resistant to acid, alkali, and salt corrosion).

5. buried pipes and passage pipes of wires and cables.

6. ventilation pipes, supply and drainage pipes of mines and mines.

7. urban sewage pipelines.

3pe anti-corrosion steel pipe

3pe anti-corrosion steel pipe refers to a 3-layer structure polyolefin coating (mapec) external anti-corrosion steel pipe. the base material includes seamless steel pipe, spiral steel pipe, and straight seam steel pipe. it is widely used in industrial pipelines. it is a commonly used anti-corrosion pipeline in china. others include ipn8710, fbe epoxy powder, epoxy coal tar pitch, and other anti-corrosion methods. generally refers to the anti-corrosion of the outer wall of the steel pipe. the anti-corrosion layer of 3pe anti-corrosion steel pipe is very important for the life of the buried pipeline. some pipes of the same material are buried underground for decades without corrosion, and some leak in a few years, because they use different outer anti-corrosion layers.

3pe anti-corrosion pipeline structure

the first layer of epoxy powder (fbe>100um)

the second layer of adhesive (ad) is 170~250um

the third layer of polyethylene (pe) 2.5~3.7mm

advantages of 3pe anti-corrosion pipes: many people only know about the use of 3pe anti-corrosion steel pipes. when ordinary steel pipes are used in harsh environments, serious corrosion will occur, which will reduce the service life of steel pipes. the service life of 3pe anti-corrosion steel pipe is also relatively long, under normal circumstances, it can be used for about 30-50 years. the long-term operation can still save a large number of resources, significantly reduce energy costs, and also has relatively strong waterproof and corrosion resistance, does not require additional pipe trenches, and can be directly buried in the ground or water, which is also simple in construction. it is fast, the overall cost is relatively low, and it also has good corrosion resistance and impact resistance under low-temperature conditions, and can be directly buried in frozen soil in a certain environment.

3pe anti-corrosion pipeline application: 3pe anti-corrosion pipeline has a very wide coverage. it is suitable for coal mine underground water supply and drainage, underground spraying, positive and negative pressure ventilation, gas drainage, fire sprinkler, and other pipeline networks. thermal power plant process water waste residue, and return water transportation pipelines. it has excellent applicability for the water supply pipeline of anti-spray and sprinkler systems. cable protection sleeve for power, communication, highway, etc. it is suitable for high-rise building water supply, heating network heating, water supply engineering, gas transmission, buried water transmission, and other pipelines. process pipelines for transporting corrosive media in petroleum pipelines, chemical pharmaceuticals, printing and dyeing, and other industries. sewage treatment discharge pipes, sewage pipes, and anti-corrosion projects of biological pools. it can be said that 3pe anti-corrosion steel pipes are indispensable in the current construction of agricultural irrigation pipes, deep well pipes, drainage pipes, and other network purposes, and it is believed that through the extension of technology, it will still have more brilliant achievements in the future.

finally, a simple way to identify the plastic-coated pipe and the 3pe anti-corrosion pipe is that the plastic-coated pipe looks very smooth in appearance, while the 3pe method pipe looks like a series of interfaces because the outer layer of the steel pipe is wrapped with a layer of anti-corrosion polyethylene tape.

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