Industry standard for PE gas pipes
目前中国的市政管材市场，塑料管道正在稳步发展， PE管、 PP-R管 、 UPVC管 都占有一席之地，其中 PE管强劲的发展势头最为令人瞩目。 PE pipe At present, in China's municipal pipe market, plastic pipes are developing steadily. PE pipes, PP-R pipes , and UPVC pipes all have a place. Among them , the strong development momentum of PE pipes is the most remarkable. PE pipes have a wide range of uses. PE 给水管 和 PE 燃气管 是其两个最大的应用市场。 Among them, PE water pipe and PE gas pipe are their two largest application markets. ，是由单体乙烯聚合而成，由于在聚合时因压力、温度等聚合反应条件不同，可得出不同密度的树脂，因而又有 高密度聚乙烯 、 中密度聚乙烯 和 低密度聚乙烯 之分。 PE resin is made from the polymerization of monomer ethylene. Due to different polymerization conditions such as pressure and temperature during polymerization, resins with different densities can be obtained, so there are high density polyethylene , medium density polyethylene and low density polymer. Ethylene points. PE管材 时，根据其应用条件的不同，选用树脂牌号的同，同时对 挤出机 和模具的要求也有所不同。 When processing different types of PE pipes , the same resin grade is used according to different application conditions, and the requirements for the extruder and die are also different.
聚乙烯管 (polythylene pipe)的材料分为PE32、PE40、PE63、PE80、PE100五个等级，而用于 PE 燃气管 和 PE 给水管 的材料主要是 PE80和PE100。 Internationally, the materials of polyethylene pipes are divided into five grades: PE32, PE40, PE63, PE80, and PE100. The materials used for PE gas pipes and PE water pipes are mainly PE80 and PE100. 聚乙烯管材 专用料没有分级，这使得国内聚乙烯燃气管和给水管生产厂家选择原材料比较困难，也给聚乙烯管材的使用带来了不小的隐患。 China does not classify the special materials for polyethylene pipes , which makes it difficult for domestic manufacturers of polyethylene gas pipes and water supply pipes to choose raw materials, and it also brings a lot of hidden dangers to the use of polyethylene pipes. 断裂伸长率 （大于 350%），即强调基本韧性。 Therefore, the National Bureau of Standards has made a lot of revisions in the new GB / T13663-2000 standard, stipulating that different levels of PE80 and PE100 of water supply pipes correspond to different pressure strengths, and the tensile strength properties in the old standards are removed, and the fracture is increased Elongation (greater than 350%), which emphasizes basic toughness.
. PE 燃气 管材 是传统的钢铁管材、聚氯乙烯燃气的换代产品。 PE gas pipe execution standard: GB 15558.1-2003 . PE gas pipe is a replacement product of traditional steel pipe and polyvinyl chloride gas. 燃气管必须承受一定的压力，通常要选用分子量大、机械性能较好的 PE树脂 ，如 HDPE树脂。 PE gas pipes must withstand a certain pressure, and usually PE resins with large molecular weight and good mechanical properties , such as HDPE resins, are used. 尺寸稳定性 差，并且连接困难，不适宜作为给水压力管的材料。 LDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding , and difficulty in connection, and is not suitable as a material for water pressure pipes. However, due to its high sanitation index, LDPE, especially LLDPE resin, has become a common material for gas pipes. LDPE and LLDPE resins have low melt viscosity, good fluidity and easy processing, so the range of choice of their melt index is also wide, usually MI is between 0.3-3g / 10min. A good pipeline should not only have good economy, but also have a series of advantages such as stable and reliable interface, material impact resistance, crack resistance, aging resistance, corrosion resistance, etc., to replace the traditional snap-on rubber hose. Solve the defects that the rubber tube is easy to fall off, easy to age, easy to bite, and short in service life.