HDPE Poly Pipe

HDPE poly pipe for water supply are the replacement products of traditional steel pipes and PVC drinking water pipes. PE pipes are used in a wide range of fields. Among them, water supply pipes and gas pipes are its two largest application markets.

The water supply pipe must bear a certain pressure, usually a PE resin with a large molecular weight and good mechanical properties, such as HDPE resin, should be used. LDPE resin has low tensile strength, differential pressure resistance, poor rigidity, poor dimensional stability during molding and difficult connection, and is not suitable as a material for water supply pressure pipes. However, due to its high hygienic index, LDPE, especially LLDPE resin, has become a common material for the production of drinking water pipes. LDPE and LLDPE resins have low melt viscosity, good fluidity, and easy processing, so their melt index can be selected in a wide range, usually MI is between 0.3-3g/10min.

Description

PE resin is polymerized by monomer ethylene. Due to different polymerization conditions such as pressure and temperature during polymerization, resins of different densities can be obtained. Therefore, there are high-density polyethylene, medium-density polyethylene and low-density polyethylene. The point of ethylene. When processing different types of PE pipes, according to their different application conditions, different resin grades are used, and the requirements for extruders and molds are also different.

Internationally, the materials of polyethylene pipes are divided into five grades: PE32, PE40, PE63, PE80, PE100, and the materials used for gas pipes and water supply pipes are mainly PE80 and PE100. my country has no classification of special materials for polyethylene pipes, which makes it difficult for domestic polyethylene gas pipe and water pipe manufacturers to choose raw materials, and it also brings a lot of hidden dangers to the use of polyethylene pipes.

Therefore, the National Bureau of Standards has made a lot of revisions in the new GB/T13663-2000 standard, which stipulates that the different grades of PE80 and PE100 of the water supply pipe correspond to different pressure strengths, and remove the tensile strength performance in the old standard, and increase the fracture Elongation (greater than 350%), which emphasizes the basic toughness.

Information

HDPE poly pipe fittings Image

Feature

■ Good hygiene performance: no heavy metal salt stabilizer is added during PE pipe processing, the material is non-toxic, no scaling layer, no bacteria breeding, and it solves the secondary pollution of urban drinking water.

■ Excellent corrosion resistance: Except for a few strong oxidants, it can withstand the erosion of a variety of chemical media; there is no electrochemical corrosion.

■ Long service life: PE pipes can be used safely for more than long-term durability according to standards under rated temperature and pressure conditions.

■ Good impact resistance: PE pipe has good toughness and high impact resistance, and heavy objects directly press through the pipe, which will not cause the pipe to rupture.

■ Reliable connection performance: The strength of the PE pipe hot-melt or electric-melt interface is higher than that of the pipe body, and the joint will not be disconnected due to soil movement or live load.

■ Good construction performance: the pipeline is light in weight, the welding process is simple, the construction is convenient, and the overall project cost is low.

Pipe connection:

■ Electrothermal welding: use a special electric welding machine to connect the straight pipe and the straight pipe, and the straight pipe and the pipe fittings. Generally used for tubes below 160mm.

■ Hot melt butt connection: use dedicated butt welder pipes to connect, generally used for pipes above 160mm.

■ Steel-plastic connection: It can be connected by flanges, threaded threads and other methods.

■ To facilitate construction and ensure construction quality, corresponding tools should be prepared.

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